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Paper: Helioseismic Frequency Shifts in Active Regions
Volume: 383, Subsurface and Atmospheric Influences on Solar Activity
Page: 305
Authors: Howe, R.; Haber, D.A.; Hindman, B.W.; Komm, R.; Hill, F.; González Hernández, I.
Abstract: The variation in the frequencies of solar acoustic modes over the activity cycle is well established. We discuss some of the historical findings, and present some recent results obtained using both global and local helioseismic analysis of data from the Global Oscillation Network Group and the Michelson Doppler Imager. The results are consistent with earlier work; the frequencies of modes in the five-minute band generally show a positive correlation with the local surface magnetic field strength, while those above the acoustic cutoff show an anticorrelation.
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