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Search for g-modes in the IPHIR data

  • Claus Fröhlich
Part IV Observations of Solar Oscillations
Part of the Lecture Notes in Physics book series (LNP, volume 367)

Abstract

The results of the IPHIR experiment on the USSR planetary mission to Phobos presented here are from data gathered during 160 days of the cruise phase of PHOBOS II to Mars, launched on 12 July 1988. The search for g-modes is based on a cross-spectral analysis of the low frequency spectrum from IPHIR (20 to 120 µHz) with theoretical g-mode spectra. These spectra are calculated using a second order asymptotic theory for the frequencies and a visibility function for the amplitudes which depends on degree and frequency; the basic period spacing of the g-modes and the rotational rate are varied in the ranges 26 < P0 < 45 minutes and 0.4 < vR < 2.0 µHz respectively. Comparison with artificial noise spectra indicates that the solar g-modes — if they exist — are buried in solar noise with an upper limit for their amplitudes of the order of 1.3 ppm at 20 µHz. More sophisticated methods to extract a possible g-mode signal from noise are proposed.

Keywords

Crimean Astrophysical Observatory Noise Power Spectrum Standard Solar Model Cruise Phase Bottom Picture 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Claus Fröhlich
    • 1
  1. 1.Physikalisch-Meteorologisches Observatorium DavosWorld Radiation CenterDavos-DorfSwitzerland

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