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2021
The Earth’s Ionosphere and Thermosphere (IT) is a highly dynamic system persistently driven by variable forcings both from above (Solar EUV and the magnetosphere) and the lower atmosphere. The forcing from below accounts for the majority of the variability at low- and mid-latitude IT region during geomagnetic quiet times.
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The Earth’s Ionosphere and Thermosphere (IT) is a highly dynamic system persistently driven by variable forcings both from above (Solar EUV and the magnetosphere) and the lower atmosphere. The forcing from below accounts for the majority of the variability at low- and mid-latitude IT region during geomagnetic quiet times.
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Icarus, 1990
Abstract We have reexamined the aeronomic model of Titan's thermosphere by A.J. Friedson and Y.L. Yung ( J. Geophys. Res. 89, A1, 85–90). Our computations disagree with theirs on the evaluation of the solar heating profile. We attribute this discrepancy to a numerical error in their code.
Emmanuel Lellouch +3 more
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Abstract We have reexamined the aeronomic model of Titan's thermosphere by A.J. Friedson and Y.L. Yung ( J. Geophys. Res. 89, A1, 85–90). Our computations disagree with theirs on the evaluation of the solar heating profile. We attribute this discrepancy to a numerical error in their code.
Emmanuel Lellouch +3 more
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Planetary and Space Science, 1961
The vertical distribution of the density in the thermosphere, deduced from satellite observations, must be explained by an increase of the scale height with altitude. A varying gradient of the scale heighht cannot be interpreted by assuming an increase of the temperature gradient with altitude.
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The vertical distribution of the density in the thermosphere, deduced from satellite observations, must be explained by an increase of the scale height with altitude. A varying gradient of the scale heighht cannot be interpreted by assuming an increase of the temperature gradient with altitude.
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Neutral composition in the thermosphere
Journal of Geophysical Research, 1972Data obtained from the Ogo 6 neutral atmospheric composition (NAC) experiment for a period of more than 1 year are used to compare the average constituent composition at an altitude of 400 km with that predicted by the Jacchia 1971 and 1965 models. The comparison shows that the Jacchia 1971 model underestimates the molecular nitrogen densities at 400 ...
D. R. Taeusch, G. R. Carignan
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Composition waves in the thermosphere
Journal of Geophysical Research, 1976Neutral-composition waves excited by auroral heat sources are investigated. For horizontal wavelengths of the order of 1000 km, it is concluded that diffusion processes (1) play a significant role such that deviations from diffusive equilibrium prevail for He throughout the thermosphere; (2) produce phase differences of about 220 deg (or -140 deg ...
H. G. Mayr, H. Volland
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Ground state of the thermosphere and substorm time thermospheric response
The thermospheric composition (O/N2 ratio and NO) condition represents the state of the thermosphere. Significant changes in thermospheric composition and neutral wind are often observed during non-storm time (e.g. a weak substorm on May 29, 2023) due to continous energy and momentum input from solar wind to the geospace.  It is challenging toYongliang Zhang +4 more
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Nitric oxide in the lower thermosphere
Planetary and Space Science, 1992Abstract Satellite measurements of nitric oxide in the lower thermosphere (100–120 km) show the density to be highly variable. The variation at low latitudes is correlated with solar activity and the variation at polar latitudes is connected with geomagnetic activity. A study of a one-dimensional, photochemical model shows that calculations of nitric
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A theory of thermospheric dynamics—II
Planetary and Space Science, 1969Geomagnetic activity, 27 day variation, and semiannual variation of thermosphere affected by solar ...
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Energetics of the midlatitude thermosphere
Journal of Atmospheric and Terrestrial Physics, 1976Thermospheric energetics is examined from the point of view of atomic and molecular processes which convert solar EUV radiative energy into kinetic energy of the ambient electron, ion, and neutral gases. The energy flow from photon to photoelectron-ion pair through energy loss and ion-molecule transfer to eventual electron-ion recombination is traced ...
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The micrometeoroids in the thermosphere and mesosphere
Astrophysics and Space Science, 1991The variation of temperature and radius of typical micrometeoroids in the low thermosphere and mesosphere is calculated theoretically, and the formation of the spherule is explained consistently with this model. The fluffy particles floating in the stratosphere is also consistent with our calculation, since the particle of radius 10μ and initial ...
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