Penumbral velocity oscillations

Details Penumbral velocity oscillations Penumbral velocity oscillations

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..125...31b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 125, Jan. 1990, p. 31-35.

Physics

10

Penumbras, Solar Oscillations, Solar Velocity, Doppler Effect, Sunspot Cycle

Scientific paper

Doppler velocity variations of four sunspot penumbrae were observed in November 1988 using the spectral line Fe I 5576 A. All of the penumbrae show local power maxima in the five-minute range, while no power is found around three minutes. This indicates that the five-minute oscillations are still present in the penumbrae, but the direction of the velocities might be tilted by the magnetic field. On the other hand, the maxima of the power and of the Evershed flow do not always occur at the same locations.

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