Local Helioseismic Mode Frequency Shifts With Magnetic Activity, From GONG and MDI

Details Local Helioseismic Mode Frequency Shifts With Magnetic Activity, From GONG and MDI Local Helioseismic Mode Frequency Shifts With Magnetic Activity, From GONG and MDI

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsp11b..06h&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SP11B-06

Astronomy and Astrophysics

Astrophysics

7500 Solar Physics, Astrophysics, And Astronomy, 7522 Helioseismology, 7536 Solar Activity Cycle (2162)

Scientific paper

We use the ring-diagram technique of local helioseismology to study the frequency shifts of high-degree solar acoustic modes from over 600 days of data from the Global Oscillations Network Group (GONG), covering the period 2001-2004. The data are compared with contemporaneous data from the Michelson Doppler Imager (MDI) dynamics program, where available. We examine both synoptic charts and the day-to-day variations in selected active regions. The results, once instrumental effects have been removed, show strong dependence of the mode frequency on the local magnetic flux, with the frequencies generally increasing with magnetic index. We relate these findings to results from global modes. This work was supported by the National Science Foundation and NASA

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