Comparison of solar p-mode oscillations in surface brightness and velocity

Details Comparison of solar p-mode oscillations in surface brightness and velocity Comparison of solar p-mode oscillations in surface brightness and velocity

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...359..232l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 359, Aug. 10, 1990, p. 232-234.

Astronomy and Astrophysics

Astrophysics

5

Brightness Distribution, Solar Oscillations, Surface Properties, Power Spectra, Solar Granulation, Vibration Mode

Scientific paper

Solar p-modes with degrees l = 30-60 were observed from Big Bear Observatory as surface velocity and surface brightness oscillations, the former at a depth of tau (5000) roughly 0.05, and the latter using a 10 A bandpass filter centered at 6687 A. Comparison of the two observations shows that the brightness/velocity oscillation power ratio for these low-l modes depends only weakly on frequency between 2 and 4 mHz. This result contradicts a similar measurement recently published by Jimenez et al. (1988), who find nearly an order of magnitude of variation in the p-mode power ratio over the same frequency range for modes with l = 1 or less. Since it is unlikely that the different l-values measured would yield a different power ratio, the cause of the discrepancy remains unknown.

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