Other
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsp41a..01t&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SP41A-01
Other
7522 Helioseismology, 7524 Magnetic Fields
Scientific paper
In local helioseismic studies, the mode characteristics of an active region are compared with those of a quiet region to estimate the influence of the magnetic field or differences in structure. Hence the selection of a proper quiet region is important in order to estimate the true variations. There are at least three possible ways in which a quiet region can be selected: (i) a common quiet region for all the events analyzed (ii) a quiet region at the same heliographic longitude and latitude within the same Carrington rotation, and (iii) an ensemble average of quiet regions. The first choice minimizes the differences that may arise from different quiet regions, but neglects the effect of temporal variations. On the other hand, the second choice introduces inherent variations present between quiet regions. It is believed that the differences in mode parameters between two quiet regions are small compared to a pair of active and quiet regions. However our analysis indicates that the differences in mode parameters between two quiet regions can be significantly large. In this paper we will illustrate the variations between quiet regions and their effect on the mode properties of the active region by selecting quiet regions in all three categories.
Hill F. F.
Jain Kunal
Tripathy Sushant C.
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