The Global Context of Solar Activity During the Whole Heliosphere Interval Campaign

Details The Global Context of Solar Activity During the Whole Heliosphere Interval Campaign The Global Context of Solar Activity During the Whole Heliosphere Interval Campaign

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640622w&link_type=abstract

American Astronomical Society, AAS Meeting #216, #406.22; Bulletin of the American Astronomical Society, Vol. 41, p.883

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Scientific paper

The Whole Heliosphere Interval (WHI) was an international observing and modeling effort to characterize the 3-D interconnected "heliophysical” system during this solar minimum. WHI studies were centered on Carrington Rotation 2068, March 20 - April 16, 2008. During the latter half of the WHI period, the Sun presented a sunspot-free, deep solar minimum face. But during the first half of CR 2068 three solar active regions flanked by two opposite-polarity, low-latitude coronal holes were apparent. These departures from the quiet Sun led to both eruptive activity and solar wind structure that inspired many studies.
Most of the 60 coronal mass ejections (CMEs) or other transients during WHI occurred during this first, active half of the interval. I review the origins and early development of the CMEs and their associated active regions. I discuss the evolution of the events in the context of the global solar magnetic field and the heliospheric current sheet. Helioseismology data from SOHO MDI is used to measure flows as a function of depth during CRs 2068 and 2069. Vortex and other large-scale, subsurface flows were found to be associated with the active regions and to precede several large CMEs. These periods are compared with magnetic activity at the surface. The overall evolution of the active regions and CMEs is analyzed in the context of the three rotations centered on CR 2068.

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