Correlation between solar activity and Earth's ionospheric electron content during the 23rd solar cycle

Details Correlation between solar activity and Earth's ionospheric electron content during the 23rd solar cycle Correlation between solar activity and Earth's ionospheric electron content during the 23rd solar cycle

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33b1774b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA33B-1774

Physics

[1220] Geodesy And Gravity / Atmosphere Monitoring With Geodetic Techniques, [2400] Ionosphere, [7974] Space Weather / Solar Effects

Scientific paper

The beginning of the 23rd solar cycle (May 1996 to December 2008) coincided with the start of the catalogue of global ionospheric modeling using GPS data. Comparison between solar activity parameters and GPS-derived Total Electron Content (TEC) is now possible for the whole of solar cycle 23. In this study, we compared the daily sunspot number and F10.7 cm flux with the daily mean global TEC values during the entire last solar cycle. In order to better understand the ionization response, we show correlations between the daily F10.7cm delivered by NGDC-NOAA (National Geophysical Data Center - National Oceanic and Atmospheric Administration) and the daily sunspot number from SIDC (Solar Influences Data Analysis Center) with the daily mean latitudinal TEC values extracted from CODE (Center for Orbit Determination in Europe) GPS-based global ionospheric maps for the period 1995-2009. The correlations were investigated for different daily mean latitudinal ionospheric TEC: (1) expressed in geographic and geomagnetic coordinates; (2) with respect to the seasons and; (3) with respect to the different phases of the solar cycle. In general, results show in the north and south hemispheres a different ionospheric response (TEC) to solar activity (F10.7cm). Moreover, the switch from geographic to geomagnetic coordinates does not change the observed correlation between TEC and solar parameters. Finally, a larger correlation is observed at N20°-30° during the transition phase in the solar cycle.

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