Mathematics – Logic
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa21a0426j&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SA21A-0426
Mathematics
Logic
2443 Midlatitude Ionosphere, 2447 Modeling And Forecasting, 2467 Plasma Temperature And Density
Scientific paper
The TEC data sets from the TOPEX/Poseidon mission (launched August 10, 1992) are now available from the NASA Physical Oceanography Distributed Active Center at JPL. These data sets have been analyzed to show the climatological TEC maps and the geomagnetic and solar activity effects on the TEC climatology. The currently available data sets cover from the middle of 1992 to 2001, which is almost a full solar cycle through the cycle 22 to 23, and hence, the data sets can show the TEC variation with the solar flux (F10.7 cm) change. The binning has been performed by season (equinox, June and December solstice), geomagnetic activity (low, moderate, and high Kp), and solar flux (low and high F10.7 cm flux) with 1 x1° bins in geomagnetic latitude and magnetic local time. The annual and semiannual anomalies seem to be quite clear, but our analysis does not show the seasonal anomaly because of the longitudinally averaged binning. The equatorial anomaly is very clear in the TEC maps and they show its variations with the geomagnetic and solar activity. The effects of the solar flux are quite clear. Compared with the low solar flux condition (F10.7 < 120), the TEC values at high solar flux (F10.7 > 120) are much larger (about 100%) and the equatorial anomaly lasts longer, up to midnight. On the other hand, even though the TEC maps show the general tendency of the ionospheric response to the change of geomagnetic conditions, it was not as clear as the solar activity effects, probably because the Kp bins don't represent real storm periods. These results and a comparison to the previous TOPEX analysis (Codrescu et al., 1999) will be presented. Reference Codrescu, M. V., et al., J. Atmos. Solar-Terr. Phys., 61, 281-298, 1999.
Jee Geonhwa
Schunk Robert W.
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