Optical observations of large-scale undulations in the 23rd cycle of solar activity

Details Optical observations of large-scale undulations in the 23rd cycle of solar activity Optical observations of large-scale undulations in the 23rd cycle of solar activity

Apr 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012ge%26ae..52..197b&link_type=abstract

Geomagnetism and Aeronomy, Volume 52, Issue 2, pp.197-203

Computer Science

Scientific paper

A statistical analysis of observations of large-scale undulations during the 23rd cycle of solar activity was performed using optical data from two stations: Tixie (71.6°N, 128.9°E) and Zhigansk (66.8°N, 123.4°E). The total number of events recorded was 54 (43 events at Tixie and 11 at Zhigansk). The complete list of observed events is presented. The occurrence frequency of eveningside (17-23 LT) undulations during the solar activity growth (1999) and decline (2003-2005) phases tends to increase. Large-scale undulations were shown to be generated both on the equatorward boundary of the diffuse auroral zone and inside the diffuse zone, which does not necessarily occur during magnetic storms.

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