Journal ArticleDOI
Vertical motion field in the middle thermosphere from satellite drag densities
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In this paper, the vertical motion field in the thermosphere is calculated from the continuity equation, based on a field of horizontal winds and an intermediate model of the temperature field consistent with the density structure inferred from satellite drag data.Abstract:
The vertical motion field in the thermosphere is calculated from the continuity equation. This calculation is based on a field of horizontal winds and an intermediate model of the thermospheric temperature field consistent with the density structure inferred from satellite drag data. The vertical motion consists of a component due to rise and fall of constant pressure surfaces and a component due to horizontal maas divergences, both components being of the order of 1 m. sec.−1 Only the latter component is of importance for thermodynamic considerations. The adiabatic warming associated with the diurnally variable part of the vertical motion due to mass divergence gives a second heat source which is of magnitude comparable to the heating by solar radiation. The time-averaged meridional circulation also implies large adiabatic warming and cooling. This computed mean meridional circulation cannot be reconciled with the heat balance of the thermosphere. The thermospheric temperature field at low level...read more
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How the thermospheric circulation affects the ionospheric F2-layer
TL;DR: In this paper, the authors summarized the physical principles that govern the behavior of the ionospheric F2-layer and reviewed the physics of thermospheric dynamics at F-layer heights, and discussed the seasonal, annual and semiannual variations of the quiet F2 peak at midlatitudes.
Journal ArticleDOI
Thermospheric winds and the F-region: A review
TL;DR: In this paper, the effects of the neutral-air winds on the ionospheric F2-layer are considered in some detail, starting from a discussion of the forces acting on the air, the equations of motion are set up and solved.
Journal ArticleDOI
Transport equations for aeronomy
TL;DR: In this paper, the authors present results for a general system of transport equations appropriate to a multi-constituent gas mixture, which includes a continuity, momentum, internal energy, pressure tensor and heat flow equation for each species.
Journal ArticleDOI
An analysis of the high‐latitude thermospheric wind pattern calculated by a thermospheric general circulation model: 1. Momentum forcing
TL;DR: In this paper, a diagnostic processor was developed for analysis of hydrodynamic and thermodynamic processes predicted by the NCAR thermospheric general circulation model (TGCM), which contains a history file on the projected wind, temperature and composition fields at each grid point for each hour of universal time.
Journal ArticleDOI
F-Region Storms and Thermospheric Circulation
TL;DR: In this article, current ideas on mechanisms of storm effects in the ionospheric F-layer at mid-latitudes, and of how they depend on the thermospheric circulation are outlined.
References
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Journal ArticleDOI
Atmospheric winds between 100 and 700 km and their effects on the ionosphere
TL;DR: In this article, the global atmospheric wind system produced at different local times by pressure gradients in the upper atmosphere is calculated using data from Jacchia's model atmosphere, and it is suggested that these may readily explain many anomalous ionospheric observations including the midday bite-out, some features of the maintenance of the night-time ionosphere, and the universal time effects observed in the high-latitude ionosphere.
Book
Static diffusion models of the upper atmosphere with empirical temperature profiles
TL;DR: Static diffusion models of upper atmosphere with empirical temperature profiles - atmospheric density and composition tables as mentioned in this paper were used for modeling the upper atmosphere of the United States in the 1970s and 1980s.
Journal ArticleDOI
Time-dependent structure of the upper atmosphere
Isadore Harris,Wolfgang Priester +1 more
TL;DR: In this article, an analysis of the integro-differential equation which describes the physical processes of the upper atmosphere is carried out, and it is found that heating of the thermosphere due to absorption of the solar extreme ultraviolet (EUV) radiation alone cannot explain the observed diurnal variation of density and temperature, since it would yield a maximum of these properties at about 17h local time, instead of 14h where it is observed.
Journal ArticleDOI
Some problems concerning the terrestrial atmosphere above about the 100 km level
TL;DR: In this article, it is shown that unless hydrogen atoms are being captured very rapidly from interplanetary space they must be very rare indeed at the base of the exosphere, and stress is laid on the importance of the steepness of the temperature gradient above the E layer in connexion with the thermal economy.