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
|