Investigating Changes in the High-Latitude Topside Ionosphere During Large Magnetic Storms

Details Investigating Changes in the High-Latitude Topside Ionosphere During Large Magnetic Storms Investigating Changes in the High-Latitude Topside Ionosphere During Large Magnetic Storms

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13c1614f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM13C-1614

Physics

[2435] Ionosphere / Ionospheric Disturbances, [2475] Ionosphere / Polar Cap Ionosphere, [2481] Ionosphere / Topside Ionosphere, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

A search was conducted to locate periods of nearly simultaneous solar-wind and high-latitude topside-ionospheric data during magnetic storms. The focus was on the 20-yr interval from 1965 to 1985 when both solar-wind and Alouette/ISIS topside-sounder data are potentially available. The search yielded 125 large magnetic storms (minimum Dst < -100) and 280 moderate magnetic storms (minimum Dst between -60 and -100). Solar-wind data were available for most, but not all, of these storms. A search of the available high-latitude topside electron-density Ne(h) profiles available from the National Space Science Data Center (NSSDC), both from manual inspection of 35-mm film ionograms in the 1960s and more recent auto-processing of ISIS-2 topside digital ionograms using the TOPIST software, during 9-day intervals associated with the 125 large magnetic storm minimum Dst times yielded the following results: 31 intervals had 10 or more manual-scaled profiles (21 intervals had more than 100 profiles and 5 of these had more than 1,000 profiles), and 34 intervals had 10 or more TOPIST profiles (2 intervals had more than 100 profiles). In addition, a search of the available Alouette-2, ISIS-1 and ISIS-2 digital ionograms during the above periods has yielded encouraging initial results in that many ISIS-1 ionograms were found for the early time intervals. Future work will include the search for 35-mm film ionograms during selected intervals. This presentation will illustrate the results of this investigation to date.

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