Results 11 to 20 of about 24,137 (262)
Chemistry of the thermosphere and ionosphere [PDF]
Journal of Atmospheric and Terrestrial Physics, 1979 The ionosphere offers an excellent laboratory for the study of atomic and molecular processes. Densities are low, permitting highly reactive species to accumulate in measurable quantities. Temporal and spatial scales are large, and the solar energy source causes substantial departures from thermodynamic equilibrium.
D. G. Torr, Marsha R. Torr
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The mid-latitude thermosphere [PDF]
Planetary and Space Science, 1988 The F-region ionosphere at middle latitudes moves up and down in an irregular manner on a time scale of hours. This behavior is a manifestation of complex coupling between photochemical, fluid dynamical, and electrodynamical processes in the thermosphere.
James C. G. Walker
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Thermosphere and satellite drag
Advances in Space Research, 2023 Accurate forecasts of thermosphere densities, realistic calculation of aerodynamic drag, and propagation of the uncertainty on the predicted orbit positions are required for conjunction analysis and collision avoidance decision making. The main focus of the Committee on Space Research (COSPAR) International Space Weather Action Teams (ISWAT) involved ...
Bruinsma, Sean +9 more
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The thermosphere of Titan [PDF]
Journal of Geophysical Research: Space Physics, 1984 The diurnal variation of the vertical structure of Titan's thermosphere is calculated through simultaneous solution of the equations of heat transfer and hydrostatic equilibrium. The temperature and density profiles are found above the mesopause. The dynamical response of the thermosphere to heating is for the most part neglected.
Friedson, A. James, Yung, Yuk L.
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Impacts of Lower Thermospheric Atomic Oxygen on Thermospheric Dynamics and Composition Using the Global Ionosphere Thermosphere Model [PDF]
Journal of Geophysical Research: Space Physics, 2020 AbstractThe exchange of energy between the lower atmosphere and the ionosphere thermosphere system is not well understood. One of the parameters that is important in the lower thermosphere is atomic oxygen. It has recently been observed that atomic oxygen is higher in summer at ∼95 km.
Garima Malhotra +5 more
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Assimilation of thermospheric measurements for ionosphere‐thermosphere state estimation [PDF]
Radio Science, 2016 AbstractWe develop a method that uses data assimilation to estimate ionospheric‐thermospheric (IT) states during midlatitude nighttime storm conditions. The algorithm Estimating Model Parameters from Ionospheric Reverse Engineering (EMPIRE) uses time‐varying electron densities in the F region, derived primarily from total electron content data, to ...
Daniel S. Miladinovich +3 more
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Dynamics of Titan’s thermosphere [PDF]
Planetary and Space Science, 2000 We estimate the wind speeds in Titan’s thermosphere by considering the various terms of the wind equation, without actually solving it, with a view to anticipating what might be observed by the Cassini spacecraft in 2004. The winds, which are driven by horizontal pressure gradients produced by solar heating, are controlled in the Earth’s thermosphere ...
Roger V. Yelle +3 more
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New perspectives on thermosphere tides: 2. Penetration to the upper thermosphere [PDF]
Earth, Planets and Space, 2014 In this paper, we present new multi-year and 72-day mean seasonal-latitudinal tidal structures in exospheric temperature derived from joint analysis of CHAMP and GRACE accelerometer measurements. These results include diurnal tides DE3, DE2, D0, and DW2 and semidiurnal tides S0, SE1, SE2, SE3, SW4, and SW6.
Forbes, J., Zhang, X., Bruinsma, S.
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Equinoctial transitions in the ionosphere and thermosphere [PDF]
Annales Geophysicae, 2001 Abstract. Equinoctial summer/winter transitions in the parameters of the F2-region are analyzed using ground-based ionosonde and incoherent scatter observations. Average transition from one type of diurnal NmF2 variation to another takes 20–25 days, but cases of very fast (6–10 days) transitions are observed as well.
Mikhailov, A. V., Schlegel, K.
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Thermospheric tides during thermosphere mapping study periods [PDF]
Advances in Space Research, 1987 Neutral exospheric temperatures at 53°, 43° and 33° latitude from Millstone Hill steerable-antenna Thomson scatter measurements, and at 19° latitude from the Arecibo Observatory, obtained during three Thermosphere Mapping Study (TMS) coordinated campaign intervals during 1984 and 1985. are analyzed for diurnal and semidiurnal tidal components.
Forbes, J. M. +3 more
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