Investigation of Subsurface Connections in Complexes of Activity by Local Helioseismology

Details Investigation of Subsurface Connections in Complexes of Activity by Local Helioseismology Investigation of Subsurface Connections in Complexes of Activity by Local Helioseismology

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21631903k&link_type=abstract

American Astronomical Society, AAS Meeting #216, #319.03; Bulletin of the American Astronomical Society, Vol. 41, p.909

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Solar active regions often emerge close to each other forming complexes of activity. The complexes may live for several solar rotations, and represent a major component of the Sun's magnetic activity. It had been suggested that the close appearance of active regions in space and time might be related to common subsurface roots, "nests" of activity. The EUV images show that the active regions are magnetically connected in the corona, but subsurface connections have not been established. We investigate the subsurface structure and dynamics of two large complexes of activity, observed during the SOHO/MDI Dynamics campaigns: AR 10484-10488 in October-November 2003, and AR 10987-10989 in March-April 2008 (this complex is a part of the Whole Heliospheric Interval campaign). The former was organized across the equator in a range of longitudes, while the later appeared in a narrow latitudinal range, probably representing a subsurface toroidal flux tube. We use the MDI full-disk Dopplergrams to measure perturbations of travel times of acoustic waves traveling to various depths by applying the surface- and deep-focusing time-distance helioseismology techniques, and obtain the sound-speed and flow maps by inversion. We compare the evolution of the large-scale subsurface sound-speed structures and dynamics of these complexes, and discuss the evidence of subsurface connections.

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