Solar wind structure sources and periodicities of auroral electron power over three solar cycles

Details Solar wind structure sources and periodicities of auroral electron power over three solar cycles Solar wind structure sources and periodicities of auroral electron power over three solar cycles

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1157e&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 10-11, p. 1157-1175.

Physics

12

Electron Auroral Energy Fluxes, Solar Wind Speed Structures, Solar Cycle Variations, Periodicities

Scientific paper

We assess the contributions of various types of solar wind structures (transients, coronal hole high-speed streams (HSS), and slow-speed wind) to hourly average auroral electron power (Pe). The time variation of the solar wind velocity (Vsw) and Pe are determined by HSS, which contribute ~47% to Pe and Vsw. Transients contribute ~42% of Pe in solar maxima, and ~6% in solar minimum. Cross-correlations of Pe with VswB for negative Bz are significant. Pe exhibits solar rotational periodicities similar to those for Vsw, with strong 7- and 9-day periodicities in 2005-2008 and equinox semiannual periodicities in 1995-1999.

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