Variation of low-order acoustic solar oscillations over the solar cycle

Details Variation of low-order acoustic solar oscillations over the solar cycle Variation of low-order acoustic solar oscillations over the solar cycle

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.345..322e&link_type=abstract

Nature (ISSN 0028-0836), vol. 345, May 24, 1990, p. 322-324. Research supported by SERC and CAICYT.

Computer Science

Sound

111

Acoustic Propagation, Solar Cycles, Solar Oscillations, Power Spectra, Solar Magnetic Field, Solar Temperature

Scientific paper

Evidence is presented that the frequencies of the lowest-order modes of solar global acoustic oscillations have varied from 1977 to 1988 in a manner that is correlated with solar activity as measured by sunspot number. The frequency variation has a peak-to-peak amplitude of 0.46 + or - 0.l06 micro-Hz, and could reflect variations in the solar dimensions or in the sound speed in the sun. These in turn might be due to changes in solar temperature and/or magnetic field.

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