Changes in high-degree mode characteristics with magnetic activity

Bogart, Richard S. ; Basu, Sarbani ; Antia, H. M. (2002) Changes in high-degree mode characteristics with magnetic activity Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO . pp. 145-148.

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We compare mode frequencies and other characteristics as determined from ring-diagram analysis of selected small regions of the Sun exhibiting strong variations in magnetic activity. These regions were observed with the Michelson Doppler Imager (MDI) on SOHO in its high-resolution mode during several years from solar minimum to maximum. To better understand the systematic uncertainties in fitting the ridges to the high-resolution data, we compare our results with those for the same regions concurrently observed in the MDI full-disc mode. We find that the properties of high degree p-modes are different in active and quiet regions and that the magnitude of the changes depend on the activity level.

Item Type:Article
Source:Copyright of this article belongs to European Space Agency.
Keywords:Helioseismology; Ring-diagrams; Mode Parameters; Solar Magnetic Activity
ID Code:75669
Deposited On:24 Dec 2011 15:08
Last Modified:18 May 2016 19:37

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