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

โœ Scribed by Martin F. Woodard

Publisher
Springer
Year
1988
Tongue
English
Weight
467 KB
Volume
114
Category
Article
ISSN
0038-0938

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โœฆ Synopsis

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 ll-yr effect but the precise mechanism is not clear.

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## Abstract We experiment with a method of measuring the frequency of solar p modes, intended to extend the passband for the variations of the frequency spectrum as high as possible. So far this passband is limited to a fraction of __ฮผ__ Hz for the classical analysis based on numerical fits of a th