Tri-phonic helioseismology: Comparison of solar p modes observed by the helioseismology instruments aboard SOHO

T. Toutain, T. Appourchaux, F. Baudin, C. Fröhlich, A. Gabriel, P. Scherrer, B. N. Andersen, R. Bogart, R. Bush, W. Finsterle, R. A. García, G. Grec, C. J. Henney, J. T. Hoeksema, A. Jiménez, A. Kosovichev, T. Roca Cortés, S. Turck-Chièze, R. Ulrich, C. Wehrli

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

The three helioseismology instruments aboard SOHO observe solar p modes in velocity (GOLF and MDI) and in intensity (VIRGO and MDI). Time series of two months duration are compared and confirm that the instruments indeed observe the same Sun to a high degree of precision. Power spectra of 108 days are compared showing systematic differences between mode frequencies measured in intensity and in velocity. Data coverage exceeds 97% for all the instruments during this interval. The weighted mean differences (V - I) are -0.1 μHz for l = 0, and -0.16 μHz for l = 1. The source of this systematic difference may be due to an asymmetry effect that is stronger for modes seen in intensity. Wavelet analysis is also used to compare the shape of the forcing functions. In these data sets nearly all of the variations in mode amplitude are of solar origin. Some implications for structure inversions are discussed.

Original languageEnglish (US)
Pages (from-to)311-328
Number of pages18
JournalSolar Physics
Volume175
Issue number2
DOIs
StatePublished - 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Tri-phonic helioseismology: Comparison of solar p modes observed by the helioseismology instruments aboard SOHO'. Together they form a unique fingerprint.

Cite this