Sun-synchronous thermal tides in exosphere temperature from CHAMP and GRACE accelerometer measurements

Details Sun-synchronous thermal tides in exosphere temperature from CHAMP and GRACE accelerometer measurements Sun-synchronous thermal tides in exosphere temperature from CHAMP and GRACE accelerometer measurements

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11611309f&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A11, CiteID A11309

Physics

1

Atmospheric Composition And Structure: Exosphere, Atmospheric Composition And Structure: Thermosphere: Energy Deposition (3369), Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

This paper focuses on the sun-synchronous diurnal (DW1) and semidiurnal (SW2) tidal components of neutral exosphere temperature derived from contemporaneous drag measurements made from the CHAMP and GRACE satellites. Densities are converted to exosphere temperatures using the parametric relationship that exists between density and temperature in the NRLMSISe00 empirical model. Daily, seasonal and solar-cycle dependencies of DW1 and SW2 in exosphere temperature are elucidated, and similarities and differences with NRLMSISe00 are detailed. In addition, using TIMED/SABER measurements between 80-110 km and viscous tidal theory, it is demonstrated that the measured seasonal-latitudinal variation of the semidiurnal exosphere temperature amplitude is dominated by the part excited in-situ in the thermosphere, as opposed to those tidal components that propagate upwards from the lower atmosphere.

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