Other
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa41a1844l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA41A-1844
Other
[0355] Atmospheric Composition And Structure / Thermosphere: Composition And Chemistry
Scientific paper
The ionospheric variation over the Korean Peninsula is examined by Daejeon GPS TEC data for the period 2000-2010 with 98% data availability. We analyze the periodicity of the daily averaged GPS local TEC and compared with solar F10.7 and EUV flux, and geomagnetic index, Ap index. At the periodic study, GPS local TEC (GLT) shows a significant annual/semiannual component, which is most obvious at the solar maximum period (2000-2002) and unclear at the solar minimum period (2008-2010). In the case of 27-day periodicity, it is quite significant only during 2003-2005 in the period of solar declining phase and there is local time dependent periodic property for GLT. Being aware of diurnal local-time variation and seasonal anomaly, we calculate hourly averaged GLT for each month. Maximum and minimum are 12-13LT and 00-01LT in the most of days respectively and GLT around 12-13LT represents clear equinoctial asymmetry for most of years but seasonal anomaly is shown only at the solar maximum period. That is, except for solar maximum period GLT at summer is higher than that of winter in 12-13LT. Otherwise it is not appeared the equinoctial or seasonal anomaly in the nighttime GLT. As global mean TEC, the daily averaged GLT has a good relationship with daily solar EUV flux and F10.7, but there is a cruel connection with Ap index. For more detailed analysis, we perform relation study with solar parameters excluding Ap > 15 events and dividing for seasons. The relationship with solar parameters in January is not a linear profile but the linear slope turning to higher EUV flux.
Chung Jaegwan
Lee Chaohong
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