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Sep 21, 2012
09/12
Sep 21, 2012
by
ROTH, W
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CRITICAL FLUTTER VELOCITY FOR A MEMBRANE IN A NONCONSERVATIVE SYSTEM IS CONSIDERED. IT IS SHOWN THAT THE DAMPING FORCES HAVE A DESTABILIZING EFFECT AND THAT A DISCONTINUITY APPEARS IN THE STABILITY CRITERION WHICH DEPENDS ON THE DAMPING COEFFICIENT AND IS CHARACTERISTIC OF NONCONSERVATIVE SYSTEMS. BY MEANS OF THIS THEORY, THE FLUTTER OF WEATHER VANES OR SAILS, AS WELL AS THE RELATED TRAVELING TRANSVERSE WAVES, CAN BE EXPLAINED.
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Topics: ATMOSPHERIC DENSITY, LUMINANCE, METEOROIDS, MATHEMATICAL MODELS, METEOR TRAILS, TURBULENCE,...
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Signer, H.; Bamberger, E. N.; Zaretsky, E. V
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A parametric study was performed with 120-mm bore angular-contact ball bearings under varying thrust loads, bearing and lubricant temperatures, and cooling and lubricant flow rates. Contact angles were nominally 20 and 24 deg with bearing speeds to 3 million DN. Endurance tests were run at 3 million DN and a temperature of 492 K (425 F) with 10 bearings having a nominal 24 deg contact angle at a thrust load of 22241 N (5000 lb). Bearing operating temperature, differences in temperatures between...
Topics: ATMOSPHERIC CIRCULATION, METEOR TRAILS, METEOROLOGICAL RADAR, RADAR TRACKING, UPPER ATMOSPHERE, AIR...
Established by the NASA Meteoroid Environment Office, the NASA All Sky Fireball Network consists of 6 meteor video cameras in the southern United States, with plans to expand to 15 cameras by 2013. As of mid-2011, the network had detected 1796 multi-station meteors, including meteors from 43 different meteor showers. The current status of the NASA All Sky Fireball Network is described, alongside preliminary results.
Topics: NASA Technical Reports Server (NTRS), METEOROID SHOWERS, ALL SKY PHOTOGRAPHY, COMPUTER PROGRAMS,...
The distribution of orbital elements and flux density over the celestial sphere are the most common forms of representation of the meteor body distribution in the vicinity of the Earth's orbit. The determination of flux density distribution of sporadic meteor bodies was worked out. The method and its results are discussed.
Topics: NASA Technical Reports Server (NTRS), METEOROID CONCENTRATION, PARTICLE FLUX DENSITY, SPORADIC...
Mechanisms of excitation of individual spectral line radiation were studied experimentally and theoretically and it was demonstrated that such processes as oxidation, resonant charge exchange, dissociative recombination and others play an important part in the chemistry of excited particles. The foundation was laid toward simulating the elementary processes of meteor physics. Having a number of advantages and possibilities, this method is sure to find a wide use in the future.
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC IONIZATION, METEOR TRAILS, METEOROID SHOWERS,...
There is no reliable experimental evidence so far of either the presence or absence of nonisothermal effects in newly formed meteor trails. Neither is there a common opinion on the most effective mechanism of electron cooling. According to the laboratory experimental data collisions of atomic and molecular particles of all kinds having velocities of 10 to 70/kms often yields 1 eV electrons and not infrequently some have energies reaching several electron volts. These highest energy electrons...
Topics: NASA Technical Reports Server (NTRS), ELECTRON ENERGY, METEOR TRAILS, NONISOTHERMAL PROCESSES,...
An extraordinary spectrum of a meteor at a velocity of about 18.5 + or - 1.0 km/s was observed with an image orthicon camera. The radiant of the meteor was at an altitude of about 49 deg. It was first seen showing a yellow red continuous spectrum alone at a height of 137 + or - 8 km which is ascribed to the first positive group of nitrogen bands. After the meteor had descended to 116 + or - 6 km above sea level it brightened rapidly from its previous threshold brightness into a uniform...
Topics: NASA Technical Reports Server (NTRS), IMAGE ORTHICONS, LINE SPECTRA, METEOR TRAILS, SPECTRUM...
The Fire 1 test was designed to study the heating of an Apollo-type reentry vehicle. The total reentry complex weighed approximately 230 kg and entered the upper atmosphere at a velocity of 11.5 km/s. The spectrum of the reentry complex has been studied in the wavelength range 3700 to 8800 A, where 102 multiplets of 21 atoms and the band systems of 5 diatomic molecules have been identified. Comparisons with meteor spectra are made.
Topics: NASA Technical Reports Server (NTRS), AERODYNAMIC HEAT TRANSFER, ATMOSPHERIC ENTRY, MOLECULAR...
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THEOREMS ARE EXTENDED OF PREVIOUS WORK BY I.M. GLASMAN CONCERNING THE SPECTRUM OF ONE-DIMENSIONAL AND MULTIDIMENSIONAL DIFFERENTIAL OPERATORS ON VECTOR FUNCTIONS. GIVEN A HILBERT SPACE OF VECTOR FUNCTIONS AND A DIFFERENTIAL OPERATOR OF SPECIFIC FORM, IT IS FIRST SHOWN THAT THE NEGATIVE PART OF THE SPECTRUM OF ANY SELF-ADJOINT EXPANSION OF AN OPERATOR L IS DISCRETE AND BOUNDED BELOW (THEOREM 1). FURTHER SPECIFICATION OF TWO SEPARATE SETS OF CONDITIONS CAUSES THE NEGATIVE PART OF THE SPECTRUM OF...
Topics: GAS EXPANSION, MATHEMATICAL MODELS, METEOR TRAILS, VAPORS, DIFFERENCE EQUATIONS, GAS DYNAMICS,...
No abstract available
Topics: NASA Technical Reports Server (NTRS), METEOROID SHOWERS, SPACE OBSERVATIONS (FROM EARTH), SPACE...
Atmospheric entry of meteoritic bodies is conveniently and accurately simulated in the laboratory by techniques which employ the charging and electrostatic acceleration of macroscopic solid particles. Velocities from below 10 to above 50 km/s are achieved for particle materials which are elemental meteoroid constituents or mineral compounds with characteristics similar to those of meteoritic stone. The velocity, mass, and kinetic energy of each particle are measured nondestructively, after...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC ENTRY SIMULATION, LUMINOUS INTENSITY, METEOR...
Complex photographic and radar meteor observations were carried out. Using the available observational data, the density of incident flux of meteoroids was estimated over a wide mass range of 0.001 to 100 g. To avoid the influence of apparatus selectivity a special technique was applied. The main characteristics of this technique are given and discussed.
Topics: NASA Technical Reports Server (NTRS), INCIDENT RADIATION, MASS DISTRIBUTION, METEOR TRAILS,...
The first infrared spectroscopy in the 3-13 micron region has been obtained of several persistent Leonid meteor trains with two different instrument types, one at a desert ground-based site and the other on-board a high-flying aircraft. The spectra exhibit common structures assigned to enhanced emissions of warm CH4, CO2, CO and H2O which may originate from heated trace air compounds or materials created in the wake of the meteor. This is the first time that any of these molecules has been...
Topics: NASA Technical Reports Server (NTRS), INFRARED RADIATION, METEOR TRAILS, LEONID METEOROIDS,...
Population parameters of 275 streams including 20 additional streams in the synoptic-year sample were found by a computer technique. Some 16 percent of the sample is in these streams. Four meteor streams that have close orbital resemblance to Adonis cannot be positively identified as meteors ejected by Adonis within the last 12000 years. Ceplecha's discrete levels of meteor height are not evident in radar meteors. The spread of meteoroid fragments along their common trajectory was computed for...
Topics: NASA Technical Reports Server (NTRS), COMPUTER TECHNIQUES, METEOR TRAILS, ORBITAL ELEMENTS, RADAR...
The fluxes and ZHRs from the 2012 Geminid meteor shower as seen in NASA's Meteoroid Environment Office's wide-field meteor cameras are presented, as well as meteoroid densities as found using the meteor's light curve and deceleration.
Topics: NASA Technical Reports Server (NTRS), GEMINID METEOROIDS, PARTICLE TRACKS, METEOR TRAILS, FLUX...
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THE PROBLEM OF PREDICTING THE DISTRIBUTION OF RADIATED SOUND ENERGY, WHEN THE DISTRIBUTION OF MEAN VELOCITY IS KNOWN, IS TREATED IN TWO STEPS. FIRST, WITH THE USE OF LIGHTHILL'S EQUATION, THE ENERGY OF SOUND IS EXPRESSED AS A FUNCTION OF KINETIC FLUCTUATION ENERGY AND A LENGTH SCALE. SECOND, THE DISTRIBUTIONS OF THE REQUIRED FIELD QUANTITIES ARE DETERMINED WITH THE AID OF THE TRANSPORT EQUATION FOR KINETIC FLUCTUATION ENERGY. COMPUTED RESULTS FOR THE AXISYMMETRIC FREE JET AND THE FREE MIXING...
Topics: ATMOSPHERIC PHYSICS, METEOR TRAILS, METEOROLOGICAL RADAR, PHYSICAL PROPERTIES, EQUIPMENT...
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xix, 372 p. 24 cm
Topics: Atmospheric circulation, Atmosphere, Upper, Meteor trails, Radio meteorology
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Electron linear density measurement and diffusion coefficient in meteor trails
Topics: DENSITY MEASUREMENT, METEOR TRAIL, DIFFUSION COEFFICIENT, ECHOES, ELECTRON DENSITY (CONCENTRATION),...
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Topics: Meteors--Bibliography., Meteor trails--Bibliography., Radio waves--Bibliography.
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,...
Recombinations in the ionized columns generated by faint radar meteors are observed as: (1) A rapid loss of returned signal in the first few milliseconds after formation of the column; (2) an apparent absence of bright, low meteors; and (3) anomalies in apparent diffusion rates. Recombination at rates characteristic of dissociative recombination of ionized atmospheric molecules N2(+) and O2(+) is completely consistent with the observations. It appears either that the molecules are ionized in...
Topics: NASA Technical Reports Server (NTRS), ELECTRON-ION RECOMBINATION, RADAR ECHOES, RADIO METEORS,...
Meteoroids bombard Earth's atmosphere daily, but occasionally meteor rates increase to unusual high levels when Earth crosses the relatively fresh ejecta of comets. These transient events in meteor activity provide clues about the whereabouts of Earth-threatening long-period comets, the mechanisms of large-grain dust ejection from comets, and the particle composition and size distribution of the cometary ejecta. Observations of these transient events provide important insight in natural...
Topics: NASA Technical Reports Server (NTRS), METEOROIDS, METEOROID CONCENTRATION, COMETS, PARTICLE SIZE...
Since the advent of low light level television (LLLTV) systems, it has been recognized that such devices offer the ability to observe meteors as faint as 10th magnitude which allows the extension of optical meteor data to masses as small as 0.0001 grams. The Space Sciences Lab at Marshall Space Flight Center has been actively engaged in such observations using image orthicons and intensified SEC vidicons. The results of these observations are presented along with an interpretation in terms of...
Topics: NASA Technical Reports Server (NTRS), MASS DISTRIBUTION, METEOR TRAILS, TELEVISION SYSTEMS, DATA...
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A computer program for rapid parametric evaluation of various types of cryogenics spacecraft systems is presented. The mathematical techniques of the program provide the capability for in-depth analysis combined with rapid problem solution for the production of a large quantity of soundly based trade-study data. The program requires a large data bank capable of providing characteristics performance data for a wide variety of component assemblies used in cryogenic systems. The program data...
Topics: DIFFUSION COEFFICIENT, METEOR TRAILS, METEOROLOGICAL RADAR, RADAR TRACKING, ATMOSPHERIC...
A solution to the problem of the diffusion of a meteor train in the geomagnetic field from an initial line density may be written in closed form in terms of effective diffusion coefficients depending on direction, enabling detailed calculations across the entire range of angle of train to field and relevant heights. While the effective diffusion coefficient in the plane of train and field then remains close to the zero field ambipolar value right up to 90 deg, the effective coefficient in the...
Topics: NASA Technical Reports Server (NTRS), DIFFUSION, DIFFUSION COEFFICIENT, GEOMAGNETISM, MAGNETIC...
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Rupe, J. H.; Shair, F. H
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Nitric oxide emission studies of internal combustion engines
Topics: METEOR TRAILS, UPPER ATMOSPHERE, WIND (METEOROLOGY), GRAVITY WAVES, TIDES, WAVE PROPAGATION
The rarefied and high Mach number (up to 270) of the flow field of a typical meteoroid as it enters the Earth's atmosphere implies conditions of ablation and atmospheric chemistry that have proven to be as difficult to grasp as the proverbial shooting star. An airborne campaign was organized to study these processes during an intense Leonid shower. A probe of molecular band emission now demonstrates that the flash of light from a common meteor originates in the wake of the object rather than in...
Topics: NASA Technical Reports Server (NTRS), AEROTHERMOCHEMISTRY, ATMOSPHERIC CHEMISTRY, METEOR TRAILS,...
Previous analyses of meteoroid compositional groupings have utilized the end height of fireballs as a diagnostic tool. From an observational perspective this definition is straight forward, but from a theoretical viewpoint there are problems with using this operational definition. In order to realistically assess the estimated geometric uncertainty of + 1 km in the observed end height, a theoretical definition of the end height of meteoritic fireballs is proposed using the results from the...
Topics: NASA Technical Reports Server (NTRS), BOLIDES, HEIGHT, KINETIC ENERGY, METEORITIC COMPOSITION,...
Studies of meteor showers permit the solving of some principal problems of meteor astronomy: to obtain the structure of a stream in cross section and along its orbits; to retrace the evolution of particle orbits of the stream taking into account gravitational and nongravitational forces and to discover the orbital elements of its parent body; to find out the total mass of solid particles ejected from the parent body taking into account physical and chemical evolution of meteor bodies; and to...
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL PHOTOMETRY, METEORITIC COMPOSITION, METEOROID...
We present in this manuscript a 4 year survey of meteor shower radiants utilizing the Southern Argentina Agile Meteor Radar (SAAMER). SAAMER, which operates at the southern most region of South America, is a new generation SKiYMET system designed with significant differences from typical meteor radars including high transmitted power and an 8-antenna transmitting array enabling large detected rates at low zenith angles. We applied the statistical methodology developed by Jones and Jones (Jones,...
Topics: NASA Technical Reports Server (NTRS), METEOROID SHOWERS, SOUTHERN HEMISPHERE, ZODIACAL DUST, RADAR,...
GLOBMET (the Global Meteor Observation System) was first proposed by the Soviet Geophysical Committee and was accepted by the Middle Atmosphere Program Steering Committee in 1982. While the atmospheric dynamics data from the system are of primary interest to MAP, GLOBMET also encompasses the astronomical radio and optical observations of meteoroids, and the physics of their interaction with the Earth's atmosphere. These astronomical observations and interactional physics with the Earth's...
Topics: NASA Technical Reports Server (NTRS), METEOR TRAILS, METEOROID SHOWERS, METEOROLOGICAL PARAMETERS,...
Eighteen Fe ablation trails were observed during the 17/18 Nov 1998 Leonid meteor shower with an airborne Fe lidar aboard the National Simulation Facility/National Center for Atmospheric Research (NSF/NCAR) Electra aircraft over Okinawa. The average altitude of the 18 trails from the high velocity (72 km/s) Leonid meteors, 95.67 +/- 0.93 km, is approximately 6.7 km higher than previously observed for slower (approx. 30 km/s) sporadic meteors. This height difference is consistent with the...
Topics: NASA Technical Reports Server (NTRS), ABLATION, IRON, IRON METEORITES, DIFFUSION, METEOROID...
In the last months, the Belgian Institute for Space Aeronomy has been developing a Belgian network for observing radio meteors using forward scattering technique. This network is called BRAMS for Belgian RAdio Meteor Stations. Two beacons emitting a circularly polarized pure sine wave toward the zenith act as the transmitters at frequencies of 49.97 and 49.99 MHz. The first one located in Dourbes (Southern Belgium) emits a constant power of 150 Watts while the one located in Ieper (Western...
Topics: NASA Technical Reports Server (NTRS), AERONOMY, FORWARD SCATTERING, YAGI ANTENNAS, METEOR TRAILS,...
Determination of wind velocity by means of Doppler meteor radars is based on the assumption that an ionized meteor trail drifts together with the neutral atmosphere. From the Doppler frequency shift it is possible to estimate the radial velocity of the trail drift. Conversion of the recorded radial velocity to the true wind velocity vector in the given space region depends both on the radar technical parameters and the chosen atmospheric motion model. The atmospheric dynamic processes structure...
Topics: NASA Technical Reports Server (NTRS), IONOSPHERIC DRIFT, MERIDIONAL FLOW, METEOR TRAILS, WIND...
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A developmental and evaluation program on polyimide laminates as printed wiring boards is described. The development of an experimental polyimide with low linear coefficient of thermal expansion normal to the plane of the board is discussed, and its properties are evaluated along with two commercial polyimide printed wiring boards for comparison with the type G-10 epoxy board. Thermal cycling data indicate an urgent need for effectively controlling the expansion normal to the plane of the board...
Topics: METEOR TRAILS, METEOROLOGICAL RADAR, WIND VELOCITY MEASUREMENT, ATMOSPHERIC CIRCULATION,...
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A new concept of architecture for urban design is discussed. The design enables solar rays to be captured and directed by means of reflection through channels to the interior of a dwelling, thereby foregoing the necessity of rooms having an outside exposure for solar illumination.
Topics: MATHEMATICAL MODELS, METEOR TRAILS, RADIO WAVES, RESONANCE, WAVE SCATTERING, INTERNATIONAL QUIET...
The work performed during the 12-month period of this contract involved: (1) further analysis of latitudinal variations in the Venusian NO nightglow intensity from PVOUVS data; (2) corrections made to the input data for the VTGCM model, relating specifically to a factor of three increase in the three-body recombination rate coefficient of N + O; (3) consideration of limits on the rate of reaction of N-atoms with CO2; (4) consideration of the Venusian equivalent of the terrestrial hot N-atom...
Topics: NASA Technical Reports Server (NTRS), PIONEER VENUS SPACECRAFT, DATA PROCESSING, LATITUDE...
We present the first global simulations on the occurrence of meteor trail plasma irregularities. These results seek to answer the following questions: when a meteoroid disintegrates in the atmosphere will the resulting trail become plasma turbulent, what are the factors influencing the development of turbulence, and how do they vary on a global scale. Understanding meteor trail plasma turbulence is important because turbulent meteor trails are visible as non-specular trails to coherent radars,...
Topics: NASA Technical Reports Server (NTRS), METEOR TRAILS, METEOROID SHOWERS, MESOSPHERE, PLASMA DENSITY,...
The effect of disturbed air behind the meteor body on the motion and ablation of fragments observed partly as the difference between the photometrically and the dynamically determined masses of the meteor body. By use of extreme mathematical conditions, this difference can be made to reach orders of magnitude during the latter part of the trajectory.
Topics: NASA Technical Reports Server (NTRS), ASTRONOMICAL PHOTOMETRY, ATMOSPHERIC IONIZATION, METEOR...
Meteor radiation appears as a result of collisions between meteoroid atoms and air molecules. Depending on duration, this radiation is usually divided into the following types: radiation of the meteor head; radiation of a coma surrounding or immediately following the meteor head; radiation of a trail formed as a result of fragments lagging behind or by the afterglow; and radiation of a meteor train forming from a tail as a result of various chemical and dynamical processes. To investigate...
Topics: NASA Technical Reports Server (NTRS), AIR, METEOR TRAILS, METEOROID SHOWERS, PARTICLE COLLISIONS,...
The observation of meteor trails by a vertical mesosphere - stratosphere - troposphere (MST) radar beam has the advantage of good height resolution and an approximate knowledge of the zenith angle since the trails are horizontal or near-horizontal. An extension of the ablation theory of meteors was developed for near horizontal trails which takes into account the curvature of the earth. Observations of the Geminid meteor shower by MST radar reveal the 'diffusion heights' to be in fair agreement...
Topics: NASA Technical Reports Server (NTRS), GEMINID METEOROIDS, MESOSPHERE, METEOR TRAILS, METEOROID...
Visual meteor observations are carried out on a regular basis by many experienced observers worldwide, thus supplying information about activity of meteor showers. The limits of the method are determined by the accuracy of the detection of the meteor trail. This study shows that visual meteor observations provide reliable data for an observable hourly rate of greater than or equal to 3.
Topics: NASA Technical Reports Server (NTRS), METEOROID SHOWERS, SPACE OBSERVATIONS (FROM EARTH), VISUAL...
The exploration of the ionospheric E region is a pressing problem, both in the applied and fundamental studies. Results are presented of an investigation: (1) to estimate the meteor ionization contribution to the night time E layer and influx; (2) to study the phenomenon of intensive sporadic layer formation following cessation of meteor stream activity; and (3) to access the role of metallic ions of meteor origin in the diurnal and seasonal variations in the occurrence probabilities of...
Topics: NASA Technical Reports Server (NTRS), ATMOSPHERIC IONIZATION, E REGION, METAL IONS, METEOR TRAILS,...
We report recent 46.8/430 MHz (VHF/UHF) radar meteor observations at Arecibo Observatory (AO) that reveal many previously unreported features in the radar meteor return - including flare-trails at both UHF and VHF - that are consistent with meteoroid fragmentation. Signature features of fragmentation include strong intra-pulse and pulse-to-pulse fading as the result of interference between or among multiple meteor head-echo returns and between head-echo and impulsive flare or "point"...
Topics: NASA Technical Reports Server (NTRS), METEOROIDS, OPTICAL RADAR, HOLOGRAPHY, ULTRAHIGH FREQUENCIES,...
Radar scattering from ionized meteor trails has been used for many years as a way to determine mesopause-level winds. Scattering occurs perpendicular to the trails, and since the ionizing efficiency of the incoming meteoroids depends on the cosine of the zenith angle of the radiant, echoes directly overhead are rare. Stratosphere-troposphere (ST) radars normally sample within 15 deg of the vertical, and thus receive few meteor echoes. Even the higher powdered mesosphere-stratosphere-troposphere...
Topics: NASA Technical Reports Server (NTRS), METEOR TRAILS, METEORITES, METEOROLOGICAL RADAR, RADIO...
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Radar detection system for delineating meteor radiants
Topics: DETECTION, MAGNITUDE, METEOR TRAILS, METEOROIDS, RADAR DETECTION, METEOR TRAIL, RADAR DETECTOR
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No Abstract Available
Topics: ATMOSPHERIC IONIZATION, METEOR TRAILS, VELOCITY MEASUREMENT, ELECTRON FLUX DENSITY, ENERGY...
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THE DEVELOPMENT OF A HUMAN LIVING ENVIRONMENT BY BIOLOGICAL METHODS UTILIZING THE APPROPRIATE FUNCTIONS OF ATROPHIC AND HETEROTROPHIC ORGANISMS IS DISCUSSED. CERTAIN PROPERTIES OF NATURAL BIOLOGICAL SYSTEMS AND A SIMULATED BIOLOGICAL LIFE SUPPORT SYSTEM ARE DISCUSSED. THE PROBLEMS AND PROSPECTS FOR THE DEVELOPMENT OF INDIVIDUAL FUNCTIONAL LINKS IN BIOLOGICAL LIFE SUPPORT SYSTEMS ARE PRESENTED.
Topics: GRAPHS (CHARTS), INFLECTION POINTS, METEOR TRAILS, RADIO WAVES, INTERNATIONAL QUIET SUN YEAR,...
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Synthesis of aromatic diamines and dialdehyde polymers using Schiff base
Topics: METEOR TRAILS, POLARIZATION (WAVES), RADIO ECHOES, SPORADIC METEOROIDS, DIFFUSION WAVES, RADIO...
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The major conclusion of the detailed examination of the human factors engineering design standard is that it is unsuitable for future spacecraft design. The standard, published in 1966, was not intended to be a zero or reduced gravity standard and was directed primarily toward ground support equipment and technology. Futhermore, ambiguities, conflicts, and unenforceable requirements contribute to the difficulty. The role of man in future space missions and its impact on human engineering...
Topics: METEOROIDS, RADIANT FLUX DENSITY, SPECTROGRAMS, COSMIC GASES, METEOR TRAILS, NITROGEN ATOMS,...
