Low-degree, L=4 modes in full-disc BiSON* helioseismological data

Details Low-degree, L=4 modes in full-disc BiSON* helioseismological data Low-degree, L=4 modes in full-disc BiSON* helioseismological data

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280.1162c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 4, pp. 1162-1166.

Astronomy and Astrophysics

Astronomy

5

Sun: Interior, Sun: Oscillations

Scientific paper

We demonstrate that some L=4 acoustic eigenmodes of the Sun are clearly distinguishable in long power spectra generated from Doppler velocity residuals collected in unimaged sunlight by the six-station Birmingham Solar Oscillations Network (BiSON). Modes covering the range n=17 to 21 have been measured in 16-month-long power spectra. They have typical amplitudes -when measured in full-disc Doppler velocity data - of less than ~1 cm s^-1 per root bin, and their frequencies have been determined to fractional accuracies of the order of 3 parts in 10^5. The sensitivity of the whole-disc observations to these modes - as implied by the data - appears to be approximately a factor of 2 greater than the theoretical predictions of Christensen-Dalsgaard.

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