Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11600h02z&link_type=abstract
Journal of Geophysical Research, Volume 116, CiteID A00H02
Astronomy and Astrophysics
Astrophysics
Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry, Atmospheric Processes: Remote Sensing (4337), Atmospheric Processes: Thermospheric Dynamics (0358), Solar Physics, Astrophysics, And Astronomy: Solar Irradiance
Scientific paper
Long-term changes in the thermospheric composition (O/N2 column density ratio) and exospheric temperature (Texo) have been examined. The data are obtained from TIMED/GUVI disk and limb measurements over half of a solar cycle from 2002 to 2007. The data indicate a positive correlation between O/N2 and solar EUV flux (Qeuv), despite large variability in O/N2 due to geomagnetic activity and season and local time effects. A function fitting provides quantitative specification of the O/N2 dependence on Qeuv. The magnitude of changes in O/N2 due to solar EUV variation between 2002 and 2007 is 40% of the mean (0.5) O/N2 over the same period and is of the same order to the changes in O/N2 due to nonsolar EUV effects (geomagnetic activity, season, and local time). Similar results are also obtained for the Texo dependence on Qeuv. The O/N2 dependence on Qeuv is due to thermal expansion or contraction that alters the reference height of the fixed N2 column density (1017 cm-2). This differs from the O/N2 depletion associated with high Texo during storm time where upward wind plays an important role.
Paxton Larry J.
Zhang Yajing
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