Local effects of a major flare on solar five-minute oscillations

Details Local effects of a major flare on solar five-minute oscillations Local effects of a major flare on solar five-minute oscillations

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..301h&link_type=abstract

In ESA, Seismology of the Sun and Sun-Like Stars p 301-304 (SEE N89-25819 19-92)

Computer Science

15

Solar Activity Effects, Solar Flares, Solar Oscillations, Solar Prominences, Sunspots, Acoustic Velocity, Hankel Functions, Helioseismology, Wave Propagation

Scientific paper

Doppler velocity images of the full Sun were obtained both during and after a major white-light flare. These velocities were interpolated onto a cylindrical coordinate system centered on the flare and decomposed into radially propagating waves defined by Hankel functions. For a similar analysis of quiet Sun regions, results show comparable power in incoming and outgoing waves irrespective of the presence of the flare. However, for the flaring region, there is 14 percent greater power in incoming as opposed to outgoing waves when there is no flare, but 5 percent greater power in outgoing than in incoming waves during the flare. This result suggests that the flare may have excited outgoing waves which counteracted the more usual absorption of incoming acoustic waves by sunspots.

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