The Short-term Relationship of Ionospheric Electron Density With Solar Irradiance and Geomagnetic Activity in Daily Observations

Details The Short-term Relationship of Ionospheric Electron Density With Solar Irradiance and Geomagnetic Activity in Daily Observations The Short-term Relationship of Ionospheric Electron Density With Solar Irradiance and Geomagnetic Activity in Daily Observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa33b0271w&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SA33B-0271

Physics

1517 Magnetic Anomalies: Modeling And Interpretation, 2415 Equatorial Ionosphere, 7538 Solar Irradiance

Scientific paper

The short-term relationship (~ 27-day and less) between equatorial ionospheric electron density, solar irradiance and geomagnetic activity in daily observations has been studied. Hourly averages of the Total Electron Content (TEC) and foF2 are used as measures of electron content at local times of 700-800 LT, 1200- 1300 LT and 1700-1800 LT from 1998 to 1999. Hourly measurements of Dst and daily measurements (6-19 nm) of the solar soft X-ray irradiances from the SNOE satellite provide the geomagnetic activity and solar irradiance information. These data are decomposed into components at ~3-day, ~9-day and ~27-day scales using a 3-band wavelet. This 3-band wavelet allows better isolation of the 27 day variations than the 2-band wavelets available in commercial software packages. At each scale, correlations of ionospheric electron content with solar irradiance and Dst are calculated. The ionosphere has the highest correlation with solar irradiance at the~27-day scales, where the correlation with TEC is 0.8. At ~3-day and ~9-day scales, the ionosphere has a more significant correlation with geomagnetic activity than with solar irradiance. At ~3-day scales, TEC has a correlation of 0.4 with Dst. With both solar irradiances and Dst, and at all three time scales, TEC has higher correlations than foF2. The correlations also change with local time. The correlations with TEC increase from morning to afternoon, when either using solar irradiances or Dst, while the correlations with foF2 do not change significantly or even decrease from morning to afternoon.

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