Longitudinal modulation of the O/N2 column density retrieved from TIMED/GUVI measurement

Details Longitudinal modulation of the O/N2 column density retrieved from TIMED/GUVI measurement Longitudinal modulation of the O/N2 column density retrieved from TIMED/GUVI measurement

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720108h&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 20, CiteID L20108

Physics

8

Ionosphere: Ionosphere/Atmosphere Interactions (0335), Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry, Ionosphere: Equatorial Ionosphere, Atmospheric Processes: Thermospheric Dynamics (0358), Atmospheric Processes: Tides And Planetary Waves

Scientific paper

The longitudinal variation of thermospheric O/N2 column density ratio is studied, based on the TIMED/GUVI measurements collected during 2002-2007. In October, a four-peaked longitudinal fluctuation in O/N2 is found. The wavenumber-4 fluctuation in equatorial O/N2 is generally stronger at lower solar activity, and maximizes in the morning of boreal summer and autumn. In boreal winter, the wavenumber-4 component gives way to the wavenumber-3. Such seasonal variation and solar activity dependence are consistent with those of the diurnal eastward-propagating mode with wavenumber-3, but the local time dependence is not. The daytime wavenumber-4 pattern in O/N2 does not shift eastward in local time as expected if it is directly connected to the DE3. No definite explanation is found for this structure, but a consideration of various mechanisms suggests that the vertical wind effect may be the most potential candidate.

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