Frequency Shifts on Time Scales of Nine Days

Details Frequency Shifts on Time Scales of Nine Days Frequency Shifts on Time Scales of Nine Days

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006spd....37.0501t&link_type=abstract

American Astronomical Society, SPD meeting #37, #5.1; Bulletin of the American Astronomical Society, Vol. 38, p.223

Astronomy and Astrophysics

Astronomy

Scientific paper

Since the p-mode frequency changes are thought to be associated with individual active regions that come and go continuously, one would anticipate that the frequencies alsochange continuously on any time scale. However, due to the finite life time of the mode, the correlation between the frequency and activity may depend on the length of the observing run. To test this hypothesis, we calculate and analyze frequency variations on time scales as short as nine-days. Using 10 years of GONG data, we establish that the global p-mode frequencies can be measured with sufficient precision on this timescale to exhibit temporal variations. We also find that these modes are significantly correlated with the strength of solar activity but the correlation coefficients are smaller as compared to long-term measurements from the GONG and SOHO/MDI.

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