Increasing the Visibility of Solar Oscillations

Details Increasing the Visibility of Solar Oscillations Increasing the Visibility of Solar Oscillations

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...518l.127t&link_type=abstract

The Astrophysical Journal, Volume 518, Issue 2, pp. L127-L130.

Astronomy and Astrophysics

Astronomy

10

Sun: Oscillations

Scientific paper

Recent calculations by Toutain, Berthomieu, & Provost predict that low-degree p- and g-modes should produce large continuum intensity perturbations close to the solar limb. Analysis of 72 hr of spatially resolved, full-disk, continuum intensity images of the Sun-obtained with the Solar Oscillations Investigation/Michelson Doppler Imager instrument on board the Solar and Heliospheric Observatory-verifies the theoretical prediction for the p-mode signal. The p-mode amplitude for observations of the solar limb is found to be more than twice that for observations of the solar disk. In addition, the low-frequency background level is substantially reduced over that measured using a full-disk analysis. The combination of these two effects suggests that observing the solar limb signal could significantly enhance our chances of detecting g-modes and low-frequency p-modes.

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