Thermospheric response to periodic variation in solar wind and tidal force

Details Thermospheric response to periodic variation in solar wind and tidal force Thermospheric response to periodic variation in solar wind and tidal force

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa31b1420z&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA31B-1420

Astronomy and Astrophysics

Astrophysics

[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry, [2455] Ionosphere / Particle Precipitation, [7526] Solar Physics, Astrophysics, And Astronomy / Magnetic Reconnection, [7959] Space Weather / Models

Scientific paper

Using measurements from ACE and TIMED/GUVI in 2005, we established a link among the dayside magnetic merging rate (MMR), auroral hemispheric power (HP), thermospheric neutral density and temperature as all of them showed clear 9-day variation. The magnitudes of the 9-day variation in the thermospheric temperature increased from the equator (|latitude| < 30) to the mid-latitude (30< |latitude| < 45) and reached their peak values in high latitudes (45< |latitude| < 90). In addition to the MMR, atmospheric tides also affect the thermospheric density and composition. Yearly average maps of GUVI nadir O/N2 from 2002 to 2009 revealed wave-3 type variations at mid-low latitudes. The wave patterns are roughly the same and fixed in the geographic coordinates. The GUVI O/N2 maps have been compared with MSIS model O/N2 with tidal forcing on. Furthermore, the peaks of the O/N2 waves are at the same locations or longitudes of the observed wave structures in the F-region electron density. This suggests that the O/N2 wave structure could be one of the driving mechanisms that control the F-region electron density. All these features provide opportunities for developing space weather forecast tools.

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