Short-term relationship between solar irradiances and equatorial peak electron densities

Details Short-term relationship between solar irradiances and equatorial peak electron densities Short-term relationship between solar irradiances and equatorial peak electron densities

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgra..11206310w&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue A6, CiteID A06310

Astronomy and Astrophysics

Astrophysics

2

Ionosphere: Equatorial Ionosphere, Ionosphere: Solar Radiation And Cosmic Ray Effects, Solar Physics, Astrophysics, And Astronomy: Solar Irradiance, Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry

Scientific paper

The short-term relationship of the equatorial peak electron density and the solar short-wavelength irradiance is examined using foF2 observations from Jicamarca, Peru and recent solar irradiance measurements from satellites. Solar soft X-ray measurements from both the Student Nitric Oxide Explorer (SNOE) (1998-2000) and Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED) (2002-2004) satellites as well as extreme ultraviolet (EUV) measurements from the TIMED satellite are used. Soft X-rays show similar or higher correlation with foF2 at short timescales (27 days or less) than EUV does, although the EUV correlation is higher for longer periods. For the short-term variations, both SNOE and TIMED observations have a higher correlation in the morning (~0.46) than in the afternoon (~0.1). In the afternoon, SNOE observations have a higher correlation (~0.2) with foF2 than the TIMED observations (~0.1 correlation), which may be due to differences in the solar cycle. At morning times, foF2 has a ~27-day variation, consistent with the solar rotation rate. After noon, but not in the morning, a ~13.5-day variation consistently appears in foF2. This ~13.5-day variation is attributed to geomagnetic influences.

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