Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa41b..02l&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SA41B-02
Physics
[2499] Ionosphere / General Or Miscellaneous
Scientific paper
We investigate the annual and hemispheric asymmetries in the ionospheric plasma density during the solar cycle 23 by analyzing the FORMOSAT-3/COSMIC, CHAMP, and ROCSAT-1 satellite data. The preliminary results obtained from the COSMIC radio occultation data shows that the ionospheric asymmetries vary with latitude, altitude, hemisphere, and local time during the solar minimum period (2007-2008). For an example, the difference in the plasma density between the June and December solstices is much more pronounced in the northern middle latitude than in the southern middle latitude. Our investigation of the ionospheric asymmetries extends to solar maximum period by analyzing the ROCSAT-1 and CHAMP satellite data between 2000 and 2002. Our goal is to provide a comprehensive understanding of the ionospheric asymmetries during the solar cycle 23 by comparing observations at different altitudes. We discuss the effects of the neutral composition, interhemispheric winds, vertical E×B drift, and Sun-Earth distance on the formation of the ionospheric asymmetries.
Cho Sungtae
Chung Jaegwan
Kil Hyosub
Kwak Younghee
Lee Weonjong
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