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The Solar Acoustic Spectrum and Eigenmode Parameters

Hill1, Stark, Stebbins

  • 1F. Hill, E. R. Anderson, J. W. Harvey, R. P. Hubbard, J. R. Kennedy, J. W. Leibacher, J. A. Pintar, C. G. Toner, R. Toussaint, and W. E. Williams are with the National Solar Observatory, National Optical Astronomy Observatories (NOAO), Post Office Box 26732, Tucson, AZ 85726-6732, USA. P. B. Stark is with the Department of Statistics and Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA. R. T. Stebbins and D. A. Haber are with JILA, University of Colorado, Boulder, CO 80309, USA. H. M. Antia is with the Tata Institute of Fundamental Research, Bombay, India. T. M. Brown and S. Tomczyk are with the High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307, USA. T. L. Duvall is with the NASA Goddard Space Flight Center, Stanford University, Center for Space Science and Astrophysics (CSSA), Stanford, CA 94305, USA. D. H. Hathaway is with the NASA Marshall Space Flight Center, Mail Code ES82, Huntsville, AL 35812, USA. R. Howe and M. J. Thompson are with the Astronomy Unit, Queen Mary and Westfield College, London E1 4NS, UK. H. P. Jones is with the NASA Goddard Space Flight Center Southwest Station, NOAO, Tucson, AZ 85726, USA. S. G. Korzennik is with the Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA. A. G. Kosovichev and J. Schou are with Stanford University, CSSA, Stanford, CA 94305, USA. K. G. Libbrecht is with the California Institute of Technology, 264-33, Pasadena, CA 91125, USA. E. J. Rhodes is with the Department of Physics and Astronomy, University of Southern California, Los Angeles, CA 90089, USA.

Science (New York, N.Y.)
|May 31, 1996
PubMed

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Summary
This summary is machine-generated.

The Global Oscillation Network Group (GONG) project precisely measures solar acoustic resonances, providing detailed data on solar activity. These findings enhance our understanding of the sun's internal structure and dynamics.

Area of Science:

  • Helioseismology
  • Solar Physics
  • Asteroseismology

Background:

  • The Sun's acoustic resonances offer insights into its internal structure and dynamics.
  • Previous helioseismic studies have provided valuable, yet sometimes differing, data.

Purpose of the Study:

  • To estimate frequencies, amplitudes, and linewidths of solar acoustic resonances using Global Oscillation Network Group (GONG) data.
  • To assess the precision and potential discrepancies of GONG measurements compared to other helioseismic datasets.

Main Methods:

  • Analysis of 36-day solar data sets from the GONG project.
  • Estimation of acoustic resonance parameters, including frequencies, amplitudes, and linewidths.
  • Averaging frequencies over azimuthal order (m) to improve resolution and reduce errors.

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Main Results:

  • Estimation of over 250,000 solar acoustic resonances.
  • Achieved a frequency resolution of 0.321 microhertz for single datasets.
  • Median formal error of 0.044 microhertz and fractional error of 1.6 x 10^-5 for m-averaged frequencies.
  • Projected fractional error of 3 x 10^-6 for a 3-year dataset.
  • Observed differences of 0.03 to 0.08 microhertz between GONG and other helioseismic datasets.

Conclusions:

  • GONG project provides high-precision measurements of solar acoustic resonances.
  • Discrepancies with other datasets may stem from systematic errors, random errors, or actual solar structure changes.
  • The findings contribute to a more accurate understanding of solar dynamics and internal processes.