Power of low-l solar oscillations and solar activity

Details Power of low-l solar oscillations and solar activity Power of low-l solar oscillations and solar activity

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.303l..63g&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 303, Issue 4, pp. L63-L68.

Astronomy and Astrophysics

Astronomy

21

Sun: Activity, Sun: Oscillations

Scientific paper

A nearly 1010-d long time-series obtained by GONG from 1995 June 10 to 1998 March 15 for disc-integrated `Sun as a star' observations has been used to study the temporal behaviour of low-degree p-mode power. The change of the mean power for several l = 0 modes with different radial orders has been investigated using a temporal window running through the complete time-series. We study the statistical distribution of the running mean power and compare it with theory. An autocorrelation analysis demonstrates the presence of different quasi-periodicities in the running mean power of the modes. There is also significant cross-correlation between the temporal behaviour of modes with different radial orders. A comparison of the temporally varying p-mode power with the coronal mass ejection event number reveals a high correlation. These observations suggest that the solar oscillations may be excited by solar active phenomena by means of a mechanism described by Wolff for solar flares.

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