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Fractional Frequency Shifts of Local Helioseismic Modes With Magnetic Activity Using Ring-Diagram Analysis

Published online by Cambridge University Press:  13 May 2016

B. Hindman ,
D. Haber ,
J. Toomre  and
R. S. Bogart
B. Hindman
Affiliation:
JILA and Dept. of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0440, USA
D. Haber
Affiliation:
JILA and Dept. of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0440, USA
J. Toomre
Affiliation:
JILA and Dept. of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309-0440, USA
R. S. Bogart
Affiliation:
Stanford University, HEPL-CSSA, Stanford, CA 94305-4085, USA

Abstract

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Using full-disk Doppler velocity data from MDI on SOHO, we have determined the central frequencies of high-degree p modes and f modes over a dense mosaic of localized regions on the sun using ring-diagram analyses (Haber et al. 2000). The motion of active regions as they rotate across the solar disk is well traced by changes in the central frequencies of the acoustic wave modes. Active regions appear as locations of large positive frequency shifts.

Type
Session II: Convection Zone and Local Area Helioseismology
Information
Symposium - International Astronomical Union , Volume 203: Recent Insights into the Physics of the Sun and Heliosphere: Highlights from Soho and Other Space Missions , 2001 , pp. 215 - 218
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

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