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2 results

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

  • B. Hindman, D. Haber, J. Toomre, R. S. Bogart
  • Journal:
    Symposium - International Astronomical Union / Volume 203 / 2001
    Published online by Cambridge University Press:
    13 May 2016, pp. 215-218
    Print publication:
    2001
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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.

  • Subsurface Flows with Advancing Solar Cycle Using Dense-Pack Ring-Diagram Analyses

  • D. A. Haber, B. W. Hindman, J. Toomre, R. S. Bogart, F. Hill
  • Journal:
    Symposium - International Astronomical Union / Volume 203 / 2001
    Published online by Cambridge University Press:
    13 May 2016, pp. 211-214
    Print publication:
    2001
    • Article
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  • Ring-diagram analyses have become a powerful local helioseismic tool for studying large-scale flows in the upper solar convection zone. Using this technique on a dense-pack mosaic of many small regions extracted from the full-disk Doppler velocity data taken with the Michelson Doppler Imager (MDI) on SOHO, we study how the mean meridional and zonal flows vary with depth and latitude over the course of the advancing solar cycle from 1996 to 2000.