Short-term changes in solar oscillation frequencies and solar activity

Details Short-term changes in solar oscillation frequencies and solar activity Short-term changes in solar oscillation frequencies and solar activity

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373l..81w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 373, June 1, 1991, p. L81-L84. Research supported by NASA and NSF

Astronomy and Astrophysics

Astrophysics

65

Solar Activity, Solar Oscillations, Frequency Shift, Solar Magnetic Field, Spectral Correlation

Scientific paper

It is shown that the frequencies of solar rho-mode oscillations change significantly over periods as short as one month. These changes correlate significantly with variations in the strength of surface solar activity as measured by the average, over the sun's visible surface, of the magnitude of the line-of-sight magnetic field component from magnetograms. The frequency and mean magnetic variations are found to obey a linear relationship. It is seen that the mean frequency shift at any time depends on the history of solar activity over an interval of, at most, several months prior to the measurement and conclude that the dominant mechanism of the frequency shift is correlated with surface magnetic activity.

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