GUVI

Global UltraViolet Imager

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

Abstract
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 Vsw|B| 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.
Year of Publication
2009
Journal
Journal of Atmospheric and Solar-Terrestrial Physics
Volume
71
Number of Pages
1157-1175
ISSN Number
1364-6826
URL
https://www.sciencedirect.com/science/article/pii/S1364682608002137
DOI
https://doi.org/10.1016/j.jastp.2008.08.005