Helioseismic observations at Stanford, 1977-1986

Details Helioseismic observations at Stanford, 1977-1986 Helioseismic observations at Stanford, 1977-1986

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8714236h&link_type=abstract

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Physics

Helioseismology, Magnetic Flux, Solar Magnetic Field, Solar Oscillations, Least Squares Method, Phase Shift, Solar Diameter, Solar Physics

Scientific paper

Observations of low degree modes of solar oscillations were made at the Wilcox Solar Observatory for more than a decade. The set of observations from 1977 through 1986 are reexamined. The stability of the p-mode frequencies for modes of degree l=2-5 in each year is tested. A marginally significant trend of a decrease in p-mode frequencies of 0.06 microHz per year is found. The continuity of the observed signal at 160.01 minutes are also examined. It was found that the previously reported phase stability is no longer present. However, due to uncertainties in calibration, the reality of the reported signal can not be excluded.

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