Frequencies of low-degree solar acoustic oscillations and the phase of the solar cycle

Details Frequencies of low-degree solar acoustic oscillations and the phase of the solar cycle Frequencies of low-degree solar acoustic oscillations and the phase of the solar cycle

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..114...21w&link_type=abstract

Solar Physics, Volume 114, Issue 1, pp.21-28

Physics

1

Scientific paper

A study of the solar total irradiance data of the Active Cavity Radiometer Irradiance Monitor (ACRIM) on the Solar Maximum Mission (SMM) satellite shows a small but formally significant shift in the frequencies of solar acoustic (p-mode) oscillations between the epochs of maximum and minimum solar activity. Specifically, the mean frequency of the strongest p-mode resonances of low spherical-harmonic degree (l = 0 2) is approximately 1.3 parts in 104 higher in 1980, near the time of sunspot maximum, than in ˜1985, near sunspot minimum. The observed frequency shift may be an 11-yr effect but the precise mechanism is not clear.

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