Changes in high-degree mode characteristics with magnetic activity

Details Changes in high-degree mode characteristics with magnetic activity Changes in high-degree mode characteristics with magnetic activity

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.508..145b&link_type=abstract

In: Proceedings of the SOHO 11 Symposium on From Solar Min to Max: Half a Solar Cycle with SOHO, 11-15 March 2002, Davos, Switze

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Helioseismology, Ring-Diagrams, Mode Parameters, Solar Magnetic Activity

Scientific paper

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.

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