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480
Jul 6, 2010
07/10
by
Friend, J
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A manual designed both as an instructional manual for beginning coders and as a reference manual for the coding language INSTRUCT, is presented. The manual includes the major programs necessary to implement the teaching system and lists the limitation of current implementation. A detailed description is given of how to code a lesson, what buttons to push, and what utility programs to use. Suggestions for debugging coded lessons and the error messages that may be received during assembly or...
Topics: SANDS, WIND (METEOROLOGY), STATISTICAL ANALYSIS, WIND EFFECTS, WIND TUNNELS
Wind loads on sun tracking solar reflector panels exposed to the atmospheric boundary layer were established through surface static pressure measurements to determine how wind affects them, specifically at the request of SPAWAR-Pacific, which has developed a custom design. A 1:8 scale model of a four-panel array was studied in the Naval Postgraduate School wind tunnel. Wind velocity, wind angle orientation, and individual panel positions, at which the highest pressure coefficient cases were...
Topics: Wind loads, wind effects, PV array, solar reflector panels.
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276
Jun 21, 2010
06/10
by
Corpas, E. L.; Mc Ardle, J. G.; Nunamaker, R. R
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eye 276
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No Abstract Available
Topics: ESTIMATES, FINS, LAUNCH WINDOWS, ROCKET VEHICLES, STATISTICAL ANALYSIS, TRAJECTORY CONTROL, WIND...
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219
Jul 12, 2010
07/10
by
NON
texts
eye 219
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No Abstract Available
Topics: LAUNCH VEHICLES, WIND EFFECTS, WIND PRESSURE, AERODYNAMIC CHARACTERISTICS, LOADS (FORCES),...
215
215
Jul 6, 2010
07/10
by
WEISER, S
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eye 215
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FEEDING A CALCIUM-DEFICIENT DIET TO PIGS AND DOGS LEADS TO REDUCED WEIGHT GAIN AND CHANGES IN BONE STRUCTURE. DETAILED TABLES ILLUSTRATE RESULTS OF ANALYSIS OF BONES AND BONE ASH FROM ANIMALS FED CALCIUM-RICH AND CALCIUM-DEFICIENT DIETS.
Topics: AERODYNAMIC COEFFICIENTS, DIRECTIONAL ANTENNAS, PARABOLIC REFLECTORS, LOADS (FORCES), WIND EFFECTS,...
722
722
Jul 12, 2010
07/10
by
Hoffman, S
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Approximately 512 bibliographies are presented for the time period from FY 77 to FY 79. Several non-SCR publications and a few papers not included in the last publication are included. Topics include propulsion, stratospheric emissions impact, materials and structure, aerodynamic performance, and stability and control.
Topics: ARCAS ROCKET VEHICLES, FLIGHT CHARACTERISTICS, SIDEWINDER MISSILES, AERODYNAMIC CHARACTERISTICS,...
212
212
Jun 12, 2011
06/11
by
Gounelle, M.; Engrand, C.; Chaussidon, M.; Zolensky, M. E.; Maurette, M
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eye 212
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Micrometeorites with sizes below 1 mm are collected in a diversity of environments such as deep-sea sediments and polar caps. Chemical, mineralogical and isotopic studies indicate that micrometeorites are closely related to primitive carbonaceous chondrites that amount to only approximately 2% of meteorite falls. While thousands of micrometeorites have been studied in detail, no micrometeorite has been found so far with an unambiguous achondritic composition and texture. One melted cosmic...
Topics: ALLUVIUM, CRATERS, DEPOSITION, MARS SURFACE, ICE, WIND EFFECTS, WATER VAPOR, SURFACE VEHICLES,...
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203
May 22, 2011
05/11
by
Ruyten, Wilhelmus M.; Keefer, Denni
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We report the results of spectroscopic measurements on the exhaust plume from a 1 kW NASA Lewis arcjet, operated on simulated ammonia. The strongest emission features consist of the Balmer lines of atomic hydrogen and a number of vibration-rotation bands of the NH radical. From the spectral data, we calculate a heavy particle temperature of about 3000 K at the exit plane, and an electron temperature of 0.30 eV. Measurements of the spatial distribution of these emission features are presented...
Topics: MEASURING INSTRUMENTS, SPACE SHUTTLES, WIND EFFECTS, WIND MEASUREMENT, WIND VELOCITY, MECHANICAL...
253
253
Jun 27, 2010
06/10
by
Allen, C. Q
texts
eye 253
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No Abstract Available
Topics: GROUND WIND, TITAN 2 ICBM, WIND EFFECTS, X-20 AIRCRAFT, AERODYNAMIC LOADS, DYNAMIC RESPONSE
504
504
May 30, 2011
05/11
by
Morgan, Dwayne R.; Streich, Ron G.; Bull, Barton; Grant, Chuc
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eye 504
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The advent of low earth orbit (LEO) commercial communication satellites provides an opportunity to dramatically reduce Telemetry, Tracking and Control (TT&C) costs of launch vehicles, Unpiloted Aerial Vehicles (UAVs), Research Balloons and spacecraft by reducing or eliminating ground infrastructure. Personnel from the Goddard Space Flight Center's Wallops Flight Facility (GSFC\WFF) have successfully used commercial Geostationary Earth Orbit (GEO) and Big LEO communications satellites for...
Topics: ATMOSPHERIC TEMPERATURE, SOLAR CORONA, SOLAR PHYSICS, SOLAR WIND VELOCITY, WIND EFFECTS, FIBER...
Topics: NASA Technical Reports Server (NTRS), DRAG REDUCTION, SURFACE VEHICLES, BOXES, WIND EFFECTS,...
231
231
Jul 5, 2010
07/10
by
KONDRATYEV, K. Y.; ROMANTEYEV, N. F.; SMOKTIY, O. I.; KHRUNOV, Y. V
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THE AIRGLOW LAYER OBSERVED BY THE SPACECRAFT SOYUZ 5 IS DESCRIBED. THE USE OF THE AIRGLOW LAYER FOR NAVIGATIONAL PURPOSES IS POSTULATED ON THE BASIS OF SOYUZ 5, SOYUZ 9, AND ROCKET MEASUREMENTS.
Topics: CATEGORIES, HURRICANES, METEOROLOGICAL PARAMETERS, TORNADOES, FUJITA METHOD, SEA STATES, WIND...
610
610
Jul 9, 2010
07/10
by
Levine, S. R.; Caves, R. M
texts
eye 610
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An investigation of the effects of pack variables on the formation of aluminide coatings on nickel-base superalloy IN-100 was conducted. Also, the thermodynamics and kinetics of coating formation were analyzed. Observed coating weights were in good agreement with predictions made from the analysis. Pack temperature rather than pack aluminum activity controls the principal coating phase formed. In 1 weight percent aluminum packs, aluminum weight gains were related to the halide pack activator....
Topics: ROTOR SPEED, WIND VARIATIONS, WINDMILLS (WINDPOWERED MACHINES), AUXILIARY POWER SOURCES, ELECTRIC...
274
274
Jun 13, 2011
06/11
by
Hatamleh, Omar; Forman, Royce; Shivakumar, Venkataraman; Lyons, Je
texts
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A new numerical method based on the strip-yield analysis approach was developed for calculating the Crack Tip Opening Displacement (CTOD). This approach can be applied for different crack configurations having infinite and finite geometries, and arbitrary applied loading conditions. The new technique adapts the boundary element / dislocation density method to obtain crack-face opening displacements at any point on a crack, and succeeds by obtaining requisite values as a series of definite...
Topics: CONTOURS, TEMPERATURE EFFECTS, WIND EFFECTS, GROUND EFFECT (AERODYNAMICS), ACOUSTICS, PROPAGATION,...
317
317
May 31, 2011
05/11
by
Kory, Carol L.; Andro, Mont
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Demands for increased data rates in satellite communications necessitate higher order modulation schemes, larger system bandwidth, and minimum distortion of the modulated signal as it is passed through the traveling wave tube amplifier (TWTA). One type of distortion that the TWTA contributes to is intersymbol interference (ISI), and this becomes particularly disruptive with wide-band, complex modulation schemes. It is suspected that in addition to the dispersion of the TWT, frequency dependent...
Topics: FABRICATION, WIND VELOCITY, EVALUATION, FLEXIBLE WINGS, UNSTEADY AERODYNAMICS, AERODYNAMIC...
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320
Jun 12, 2011
06/11
by
Becker, K. J.a; McAuley, M; Gaddis, L. R.; Soderblom, L. A.; Kirk, R. L.; Archinal, B. A.; Johnson, J. R.; Anderson, J. A.; Bowman-Cisneros, E.; LaVoie, S.
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Over the past 40 years, an enormous quantity of orbital remote sensing data has been collected for Mars from many missions and instruments. Unfortunately these datasets currently exist in a wide range of disparate coordinate systems, making it extremely difficult for the scientific community to easily correlate, combine, and compare data from different Mars missions and instruments. As part of our work for the PDS Imaging Node and on behalf of the USGS Astrogeology Team, we are working to solve...
Topics: MARS SURFACE, PLANETARY GEOLOGY, WIND EFFECTS, SYNTHETIC APERTURE RADAR, CLIMATE, DEPOSITS,...
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1.3K
Jul 23, 2010
07/10
by
Murri, Daniel G.; Jordan, Frank L., Jr
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An investigation was conducted in the Langley 30- by 60-Foot Wind Tunnel to evaluate the performance, stability, and control characteristics of a full-scale general aviation airplane equipped with an advanced laminar flow wing. The study focused on the effects of natural laminar flow and advanced boundary layer transition on performance, stability, and control, and also on the effects of several wing leading edge modifications on the stall/departure resistance of the configuration. Data were...
Topics: CONFIGURATION MANAGEMENT, FLYING PLATFORMS, HIGH ALTITUDE, STRUCTURAL DESIGN CRITERIA, COST...
351
351
Jul 23, 2010
07/10
by
NON
texts
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Two modules of gallium-doped germanium (Ge:Ga) infrared detectors with integrated multiplexing readouts and supporting drive electronics were designed and tested. This development investigated the feasibility of producing two-dimensional Ge:Ga arrays by stacking linear modules in a housing capable of providing uniaxial stress for enhanced long-wavelength response. Each module includes 8 detectors (1x1x2 mm) mounted to a sapphire board. The element spacing is 12 microns. The back faces of the...
Topics: FLIGHT HAZARDS, FLIGHT SIMULATION, MATHEMATICAL MODELS, WIND SHEAR, AIRBORNE EQUIPMENT, FLIGHT...
177
177
Jul 9, 2010
07/10
by
STEIN, D
texts
eye 177
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DENMARK WAS ONE OF THE FIRST COUNTRIES TO TURN ITS ATTENTION TO GENERATING ELECTRIC ENERGY FROM WIND POWER, BECAUSE IT HAS TO IMPORT ALL OIL AND COAL IT USES, AND IT HAS VIRTUALLY NO HYDROELECTRIC POWER. A LARGE NUMBER OF WIND POWER STATIONS WERE BUILT IN THE EARLY YEARS OF WORLD WAR I WHEN FUEL WAS SCARCE. THE TOTAL PRODUCTION OF WIND POWER WAS ESTIMATED AT APPROXIMATELY 1.8 MILLION KWH IN 1941. THE INSTALLATION OF WIND POWER STATIONS WAS GENERALLY CONSIDERED TO BE A TEMPORARY MEASURE.
Topics: ELECTRIC POWER PLANTS, WINDMILLS (WINDPOWERED MACHINES), WINDPOWERED GENERATORS, ENERGY SOURCES,...
Previous research has been conducted to investigate the effect of the low-level wind region on summertime convective storms in the east central Florida area. These effects were described by analyzing the distribution of lightning flashes within classifications based on the low-level wind regime for the months June through September of 1987 to 1990. The present research utilizes the same classification strategy to study rainfall patterns for data gathered for the CaPE (Convection and...
Topics: NASA Technical Reports Server (NTRS), CLASSIFICATIONS, CONVECTION, LIGHTNING, RAIN, STORMS, WIND...
Will discuss how their organization is trying to streamline workflows and the change management process with business rules. In looking for ways to make things more efficient and save money one way is to reduce the work the workflow task approvers have to do when reviewing affected items. Will share the technical details of the business rules, how to implement them, how to speed up the development process by using the API to demonstrate the rules in action.
Topics: NASA Technical Reports Server (NTRS), SOFTWARE ENGINEERING, COMPUTER PROGRAMS, MANAGEMENT SYSTEMS,...
183
183
Jul 6, 2010
07/10
by
LINKO, N
texts
eye 183
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AN AIRBORNE RADIOMETER FOR CONTINUOUSLY MEASURING THE SEA WATER TEMPERATURE IS DESCRIBED. THE INSTRUMENT DETECTS INFRARED RADIATION AND CONVERTS IT TO ELECTRICAL SIGNALS WHICH ARE RECORDED AS TEMPERATURE WITH AN ACCURACY WITHIN 0.2 DEGREES. ITS USE FOR LOCATING PELAGIC FISH FOR COMMERCIAL FISHING IS BRIEFLY DISCUSSED.
Topics: ELECTRIC GENERATORS, ELECTRIC POWER SUPPLIES, PROPELLERS, WIND EFFECTS, WIND PRESSURE, WINDPOWERED...
Environment criteria are presented for the High Energy Astronomy Observatory Program. Information in selected disciplinary areas is given for the region of space that is within 1000 km from the earth's surface.
Topics: NASA Technical Reports Server (NTRS), ENVIRONMENTAL ENGINEERING, HEAO, HUMAN FACTORS ENGINEERING,...
and Accreditation (VV&A) session audience, a snapshot review of the Exploration Space Mission Directorate s (ESMD) investigation into implementation of a modeling and simulation (M&S) VV&A program. The presentation provides some legacy ESMD reference material, including information on the then-current organizational structure, and M&S (Simulation Based Acquisition (SBA)) focus contained therein, to provide a context for the proposed M&S VV&A approach. This reference...
Topics: NASA Technical Reports Server (NTRS), DATA INTEGRATION, SPACE MISSIONS, SIMULATION, SPACE...
1,200
1.2K
Jul 23, 2010
07/10
by
Espenak, Fre
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A complete catalog is presented, listing the general characteristics of every solar eclipse from 1901 through 2100. To complement this catalog, a detailed set of cylindrical projection world maps shows the umbral paths of every solar eclipse over the 200 year interval. Focusing in on the next 50 years, accurate geodetic path coordinates and local circumstances for the 71 central eclipses from 1987 through 2035 are tabulated. Finally, the geodetic paths of the umbral and penumbral shadows of all...
Topics: AIRCRAFT PERFORMANCE, FLIGHT CHARACTERISTICS, FLIGHT SIMULATORS, PILOT TRAINING, WIND SHEAR,...
547
547
Jul 23, 2010
07/10
by
Bar-Itzhack, Itzhack Y.; Markley, F. Landi
texts
eye 547
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As demonstrated in this work, all orthogonal matrices solve a first order differential equation. The straightforward solution of this equation requires n sup 2 integrations to obtain the element of the nth order matrix. There are, however, only n(n-1)/2 independent parameters which determine an orthogonal matrix. The questions of choosing them, finding their differential equation and expressing the orthogonal matrix in terms of these parameters are considered. Several possibilities which are...
Topics: AIRCRAFT CONTROL, FLIGHT PATHS, MICROBURSTS (METEOROLOGY), WIND SHEAR, LINEAR QUADRATIC REGULATOR,...
A method was developed whereby a balloon was used to carry lumber out of a forest in order to continue lumber production without destroying the natural environment and view of the forest. Emphasis was on the best shape for a logging balloon, development of a balloon logging system suitable for cutting lumber and safety plans, tests on balloon construction and development of netting, and weather of mountainous areas, especially solutions to problems caused by winds.
Topics: NASA Technical Reports Server (NTRS), BALLOONS, CUTTING, FORESTS, NETS, WIND EFFECTS, GAS TURBINES,...
353
353
Jun 15, 2011
06/11
by
Groskopfs, E
texts
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A multi-point release mechanism used on the communications technology satellite. The mechanism is designed to jettison one large panel and to release a second panel; both panels have independent multi-point attachments to the spacecraft and require to be released in sequence. The solar array is stowed concertina fashion under 2 psi pressure to ensure that no movement occurs between the stowed folds of the array during the launch. One pair of linear pyrotechnic-actuators releases both the JBSA...
Topics: DYNAMIC MODELS, LANDING GEAR, SHORT TAKEOFF AIRCRAFT, WIND EFFECTS, CROSS FLOW, DIRECTIONAL...
Radar observations of the migratory habits of passerine birds over a 10 year period are presented. The relationships between intensity of cloud cover and the frequency and density of migration are illustrated. The aspects of migration which were determined by the radar were: (1) migration under total overcast, (2) compensation for wind drift, (3) changes in flight direction during migration, and (4) effects of meteorological parameters.
Topics: NASA Technical Reports Server (NTRS), BIRDS, METEOROLOGICAL PARAMETERS, MIGRATION, RADAR TRACKING,...
CEOP has contributed and will continue to provide integrated data sets from diverse platforms for better understanding of the water and energy cycles, and for validating models. In this talk, I will show examples of how CEOP has contributed to the formulation of a strategy for the study of the monsoon as a system. The CEOP data concept has led to the development of the CEOP Inter-Monsoon Studies (CIMS), which focuses on the identification of model bias, and improvement of model physics such as...
Topics: NASA Technical Reports Server (NTRS), CLIMATE MODELS, MONSOONS, CONVECTION, DIURNAL VARIATIONS,...
It is critical that the geological context of planetary samples (both in situ analyses and return samples) be well known and documented. Apollo experience showed that this goal is often difficult to achieve even for a planet on which surficial processes are relatively restricted. On Mars, the variety of present and past surface processes is much greater than on the Moon and establishing the geological context of samples will be much more difficult. In addition to impact hardening, Mars has been...
Topics: NASA Technical Reports Server (NTRS), MARS SURFACE SAMPLES, PLANETARY SURFACES, STRATEGY, WIND...
830
830
Jul 9, 2010
07/10
by
REZNICEK, R
texts
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A REVIEW IS PRESENTED OF ALL THE METHODS OF STUDYING FLUID FLOWS WHICH MAKE IT POSSIBLE TO OBTAIN AN OPTICAL RECORDING, OR IMAGE, OF THE PROPERTIES OF A FLOW FIELD AND THEIR DEVELOPMENT IN TIME. THE METHODS DISCUSSED INCLUDE THOSE BASED ON THE INTRODUCTION OF PARTICLES INTO A FLUID WHICH HAVE PROPERTIES DIFFERING FROM THOSE OF THE FLUID, METHODS IN WHICH OBSERVATIONS ARE MADE OF THE CHANGES OCCURRING IN A SPECIAL COATING APPLIED TO THE SURFACE OF A BODY IN A FLUID FLOW, AND METHODS WHICH TAKE...
Topics: ELECTRIC POWER PLANTS, ENERGY SOURCES, FEASIBILITY ANALYSIS, WINDPOWER UTILIZATION, COST...
One of several fuel-saving operational concepts being investigated is the application of state-of-the-art hand-held calculators to serve as Flight Performance Adivosry Systems (FPAS). The principal function of a FPAS is to advise the pilot, based on the aircraft drag configuration, and gross weight, of the optimum flight performance parameters such as altitude and airspeed. The research reported herein is the development of the mathematical relationships for the effects of the wind on the...
Topics: Flight Performance Advisory Systems, The wind effects on the aircraft optimum cruise performance,...
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262
Jul 9, 2010
07/10
by
HENTSCHEL, G.; BLOBEL, H
texts
eye 262
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A TUBE TEST FOR THE QUANTITATIVE DETERMINATION OF FIBRINOLYSIN WAS DEVELOPED. THE SUBSTRATE WAS A 3% FIBRINOGEN SOLUTION, WHICH HAD BEEN CLOTTED BY STAPHYLOCOCCAL COAGULASE. THE REACTIONS WERE RECORDED AFTER 3 HOURS AT 37 C.
Topics: ENERGY SOURCES, FEASIBILITY ANALYSIS, WINDMILLS (WINDPOWERED MACHINES), WINDPOWER UTILIZATION, COST...
Wind change statistics are analyzed for Vandenberg AFB, California (VAFB) and Kennedy Space Center, Florida (KSC). Means and standard deviations of wind component change and vector wind change modulus within 3-9 and 9-16 km altitude bands are tabulated. The contribution to 3.5 hr wind component change by wind perturbations in various wavelength bands is evaluated. Probability distributions of maximum 3.5 hr wind change in an altitude band are presented and a model for wind change at a specified...
Topics: NASA Technical Reports Server (NTRS), GUST LOADS, PERTURBATION, SPACE SHUTTLES, WIND EFFECTS,...
294
294
Jul 9, 2010
07/10
by
KLOSS, M
texts
eye 294
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VARIOUS ASPECTS OF WIND POWERED SYNCHRONOUS GENERATORS ARE DESCRIBED. THE INFLUENCE OF THE FAN WHEEL CHARACTERISTIC ON DAMPING OF TRANSIENTS IS SLIGHT. ALTERING VANE POSITION IS THE ONLY FEASIBLE METHOD FOR REGULATING POWER IN ORDER TO AVOID OVERLOADING THE GENERATOR. IN DESIGNING THE FAN WHEEL, AND CHOOSING THE NUMBER OF VANES, THE OPERATING BEHAVIOR OF THE GENERATOR AND THE DANGER OF RESONANCE MUST BE CONSIDERED AHEAD OF EFFICIENCY. PRACTICAL OPERATING CHARACTERISTICS OF THE FAN WHEEL MUST BE...
Topics: COST EFFECTIVENESS, ELECTRIC POWER PLANTS, FEASIBILITY ANALYSIS, WINDPOWERED GENERATORS, ECONOMIC...
An advective mixed layer ocean model was developed by eliminating the assumption of horizontal homogeneity in an already existing mixed layer model, and then superimposing a mean and anomalous wind driven current field. This model is based on the principle of conservation of heat and mechanical energy and utilizes a box grid for the advective part of the calculation. Three phases of experiments were conducted: evaluation of the model's ability to account for climatological sea surface...
Topics: NASA Technical Reports Server (NTRS), ADVECTION, MATHEMATICAL MODELS, PREDICTIONS, SEAS, SURFACE...
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318
Jul 23, 2010
07/10
by
NON
texts
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Publications of research sponsored by the NASA CELSS (Controlled Ecological Life Support Systems) Program are listed, along with publications of interest to the Program. The bibliography is divided into the three major divisions of CELSS research: (1) Food Production; (2) Waste Management; and (3) Systems Management and Control. This bibliography is an update of NASA CR-3911 and includes references from 1984 through 1986.
Topics: ATMOSPHERIC DENSITY, WIND EFFECTS, DESCENT TRAJECTORIES, REFERENCE ATMOSPHERES, SPACECRAFT CONTROL,...
The application of radar and visual techniques to determine the migratory habits of passerine birds during daylight and darkness is discussed. The effects of wind on the direction of migration are examined. Scatter diagrams of daytime and nocturnal migration track directions correlated with wind direction are presented. It is concluded that migratory birds will fly at altitudes where wind direction and migratory direction are nearly the same. The effects of cloud cover and solar obscuration are...
Topics: NASA Technical Reports Server (NTRS), BIRDS, MIGRATION, NAVIGATION, RADAR TRACKING, VISUAL...
Natural environment criteria are established and interpreted for aeronautical vehicle design and engineering operations. Data summaries, computer formats, frequency distributions, and composite listings of the temperature profiles acquisition program are included.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC EFFECTS, STRUCTURAL DESIGN CRITERIA, TEMPERATURE...
Aerial photographic and laser profilometer data of waves generated by tropical storm Amy are presented. The data mission consisted primarily of two legs, one in the direction of the wind waves, and the second along the direction of swell propagation, using Jennette's Pier at Nags Head, North Carolina, as a focal point. At flight time, Amy's center was 512 nmi from shore and had maximum winds of 60 knots. The storm's history is presented, along with a satellite photograph, showing the extent of...
Topics: NASA Technical Reports Server (NTRS), AERIAL PHOTOGRAPHY, COASTS, TROPICAL STORMS, WATER WAVES,...
This three-year grant began on November 7, 1996 and was no-cost extended to end on October 30, 2000. The objectives of the grant were: (1) To examine the effect of wind tunnel turbulence on ice accretion; (2) To determine the relationship between ice accretion geometry and airfoil performance; and (3) To determine if the wake-survey method was an appropriate experimental technique for iced-airfoil drag measurement. As specified in the grant the primary deliverables for this research were annual...
Topics: NASA Technical Reports Server (NTRS), AIRFOILS, ICE FORMATION, WIND EFFECTS, TURBULENCE, WIND...
The atmospheric trajectory is calculated of a particularly well studied fireball and train during the 1999 Leonid Multi-Instrument Aircraft Campaign. Less than a minute after the meteor's first appearance, the train curves into a '2'-shape, which persisted until at least 13 minutes after the fireball. We conclude that the shape results because of horizontal winds from gravity waves with a scale height of 8.3 km at 79-91 km altitude, as well as a westerly wind gradient with altitude. In...
Topics: NASA Technical Reports Server (NTRS), LEONID METEOROIDS, BOLIDES, METEOR TRAILS, WIND EFFECTS,...
In Cram's theory for the formation of the K-coronal spectrum he observed the existence of temperature sensitive anti-nodes, which were separated by temperature insensitive nodes, at certain wave-lengths in the K-coronal spectrum. Cram also showed these properties were remarkably independent of altitude above the solar limb. In this thesis Cram's theory has been extended to incorporate the role of the solar wind in the formation of the K-corona, and we have identified both temperature and wind...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC TEMPERATURE, SOLAR CORONA, SOLAR PHYSICS, SOLAR...
People and property at Kennedy Space Center (KSC) and Cape Canaveral Air Force Station (CCAFS) are at risk when severe weather occurs. Strong winds, hail and tornadoes can injure individuals and cause costly damage to structures if not properly protected. NASA's Launch Services Program and Ground Systems Development and Operations Program and other KSC programs use the daily and weekly severe weather forecasts issued by the 45th Weather Squadron (45 WS) to determine if they need to limit an...
Topics: NASA Technical Reports Server (NTRS), METEOROLOGICAL PARAMETERS, WEATHER FORECASTING,...
The use of a tracking radar to measure the flight paths of migrating birds on nights with opaque clouds is discussed. The effects of wind and lack of visual references are examined. The limitations of the radar observations are described, and samples of tracks obtained during radar observations are included. It is concluded that nonvisual mechanisms of orientation make it possible for birds to migrate in opaque clouds, but the exact nature of the sensory information cannot be determined by...
Topics: NASA Technical Reports Server (NTRS), BIRDS, CLOUDS (METEOROLOGY), MIGRATION, RADAR TRACKING, WIND...
This document presents results of a field study of the effect of sheltering of wind sensors by nearby foliage on the validity of wind measurements at the Space Shuttle Landing Facility (SLF). Standard measurements are made at one second intervals from 30-feet (9.1-m) towers located 500 feet (152 m) from the SLF centerline. The centerline winds are not exactly the same as those measured by the towers. A companion study, Merceret (1995), quantifies the differences as a function of statistics of...
Topics: NASA Technical Reports Server (NTRS), MEASURING INSTRUMENTS, SPACE SHUTTLES, WIND EFFECTS, WIND...
Methods of analyzing bird migration by using tracking radar are discussed. The procedure for assessing the rate of bird passage is described. Three topics are presented concerning the grouping of nocturnal migrants, the velocity of migratory flight, and identification of species by radar echoes. The height and volume of migration under different weather conditions are examined. The methods for studying the directions of migration and the correlation between winds and the height and direction of...
Topics: NASA Technical Reports Server (NTRS), BIRDS, MIGRATION, RADAR IMAGERY, RADAR TRACKING, ACTIVITY...
On Earth, cold region sand dunes often contain inter-bedded sand, snow, and ice. These mixed deposits of wind-driven snow, sand, silt, vegetal debris, or other detritus have been termed Niveo-aeolian deposits. These deposits are often coupled with features that are due to melting or sublimation of snow, called denivation features. Snow and ice may be incorporated into dunes on Mars in three ways. Diffusion of water vapour into pore spaces is the widely accepted mechanism for the accretion of...
Topics: NASA Technical Reports Server (NTRS), ALLUVIUM, CRATERS, DEPOSITION, MARS SURFACE, ICE, WIND...
A simplified theory of aircraft vertical acceleration gust response based on a model including pitch, vertical displacement and control motions due to autopilot operation is presented. High-order autopilot transfer functions are utilized for improved accuracy in the determination of the overall response characteristics. Four representative commercial jet aircraft were studied over a wide range of operating conditions and comparisons of individual responses are given. It is shown that autopilot...
Topics: NASA Technical Reports Server (NTRS), AUTOMATIC PILOTS, COMMERCIAL AIRCRAFT, GUST LOADS, JET...
