Plasma density undulations in the nighttime mid-latitude F-region as observed by CHAMP, KOMPSAT-1, and DMSP F15

Details Plasma density undulations in the nighttime mid-latitude F-region as observed by CHAMP, KOMPSAT-1, and DMSP F15 Plasma density undulations in the nighttime mid-latitude F-region as observed by CHAMP, KOMPSAT-1, and DMSP F15

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jastp..72..183p&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 72, Issue 2-3, p. 183-192.

Physics

2

Ionospheric Irregularities, Mid-Latitude Ionosphere, Topside Ionosphere, Ionospheric Current

Scientific paper

We investigate plasma density undulations in the nighttime mid-latitude topside F-region. During solar maximum years the undulations are found at CHAMP, KOMPSAT-1, and DMSP F15 altitudes. The occurrence rate is higher at KOMPSAT-1 than at DMSP F15 altitude. The undulations occur infrequently during equinoxes, and the occurrence peaks are in the Asian/Oceanian (eastern Pacific/American) region during June (December) solstice. At CHAMP altitude the undulations are observed all through the night, and the occurrence rate is anti-correlated with the solar cycle. As all these results are in general agreement with known climatology of MSTIDs, we suggest that the undulations are a topside signature of MSTIDs. The undulations are often but not always accompanied by magnetic signatures indicating the presence of field-aligned current (FAC). The partial lack in correspondence might be due to the ionospheric conductivity variation. The similar distribution is, however, in support of a connection between density undulations and FACs.

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