Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh11a1493h&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SH11A-1493
Astronomy and Astrophysics
Astrophysics
[2159] Interplanetary Physics / Plasma Waves And Turbulence, [2169] Interplanetary Physics / Solar Wind Sources, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle
Scientific paper
It has recently been shown (Smith and Balogh 2008) that power levels in the high speed solar wind are significantly lower in the current solar minimum that the previous one. We extend this analysis to show that there is a persistent North/South asymmetry in power levels in the polar solar wind in both the previous and current minima, consistent with the known asymmetric heliospheric current sheet configuration over this time. In addition, we show that the reduced power levels during this minimum are frequency-dependent, and reach around 40% at high frequencies. We discuss possible causes of this dramatic change and in particular whether this is due to a lower source wave power in the corona, or a longer evolution time due to the slower wind speed. We also discuss the implications for cosmic ray transport, and whether these effects are potentially observable.
Horbury Tim S.
Owens Mathew J.
Wicks Robert T.
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