Journal ArticleDOI
Thermospheric winds from the satellite electrostatic triaxial accelerometer system
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In this paper, the authors used a satellite electrostatic triaxial accelerometer (SETA) to measure the velocities of cross-track winds in the presence of geomagnetic activity.Abstract:
A new thermospheric wind measurement technique is reported, which is based on a satellite electrostatic triaxial accelerometer (SETA) system capable of accurately measuring accelerations in the satellite's in-track, cross-track, and radial directions. Cross-track winds measured on 74 orbits between 170 and 210 km during a 5-day period of mostly high geomagnetic activity are analyzed to demonstrate the potential contributions of SETA data to studies of thermospheric dynamics. On the basis of an analysis which depends upon alignment of null points in the cross-track winds, the data are shown to be consistent with a two-cell polar circulation pattern characterized by a main flow parallel to the 1600/0400 geomagnetic local time meridian and return flows in the late morning and late evening sectors. The flow pattern is asymmetric in that it is displaced about 5°–10° latitude toward the noon (geomagnetic local time) sector, and the evening cell is somewhat more diffuse than the morning cell. The system also covers a greater area of the polar cap and is more intense during active (Kp ≳ 5o) than quiet (Kp ≲ 3o) geomagnetic conditions. Average main flow velocities are characteristically of the order of 150±75 m s−1 for Kp ≈ 2o and 375±100 m s−1 for Kp ≈ 5o, the stated variabilities representing 1σ deviations.read more
Citations
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Journal ArticleDOI
Global thermospheric neutral density and wind response to the severe 2003 geomagnetic storms from CHAMP accelerometer data
TL;DR: In this article, measurements of atmospheric density near 410 km from the STAR accelerometer on the CHAMP satellite are used to illustrate the spatial-temporal dependence of the thermospheric response to the severe solar storms occurring during 29 October to 1 November 2003.
Journal ArticleDOI
Global distribution of the thermospheric total mass density derived from CHAMP
TL;DR: In this paper, a global distribution of the thermospheric total mass density at 400 km altitude is derived from the high-accuracy accelerometer on board the CHAMP satellite with good temporal and spatial coverage.
Journal ArticleDOI
Density and Winds in the Thermosphere Deduced from Accelerometer Data
TL;DR: In this article, the authors focus on the derivation and methodology of inferring density and winds from along-track and cross-track accelerometer measurements, with themain goal of determining the feasibility of this data set.
Journal ArticleDOI
Empirical global model of upper thermosphere winds based on atmosphere and dynamics explorer satellite data
TL;DR: In this article, an empirical wind model for the upper thermosphere, analogous to the MSIS model for temperature and density, using a limited set of vector spherical harmonics, is presented.
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Thermospheric Density and Wind Determination from Satellite Dynamics
TL;DR: Empirical modelling of the thermosphere and non-gravitational force modelling using satellite dynamics observations is presented in this article, where the authors propose a method to produce density and crosswind from satellite dynamics data.
References
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TL;DR: In this article, the authors present static models with empirical thermal profiles, giving temperature, density and composition as a function of height, for both the atmosphere and exosphere static models.
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Atmospheric tides: 1. Model description and results for the solar diurnal component
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TL;DR: In this paper, solar and lunar semidiurnal wind and temperature oscillations from the surface to 400 km were simulated for average solar activity conditions utilizing the numerical tidal model described in part 1.
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Global circulation and temperature structure of thermosphere with high‐latitude plasma convection
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