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Astron. Astrophys. 322, 302-306 (1997)

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Resonant absorption and the spectrum of 5-min oscillations of the Sun

V.I. Zhukov

Central Astronomical Observatory Russian Academy of Sciences, 65 Pulkovo, 196 140 St. Petersburg, Russia

Received 21 November 1995 / Accepted 23 July 1996

Abstract

Magnetic field influence on 5-min solar oscillations spectrum is investigated. Proper oscillations spectrum is calculated for the model of the shell with linear temperature profile in the bottom layer while the top layer is exemplified by homogeneous magnetic field and sharp temperature increase, reaching the coronal value at the height about [FORMULA]. It is shown, that taking into account of acoustic energy absorption at Alfven resonant levels in the chromosphere one can provide an explanation for existing discrepancies between the observed and theoretically calculated frequencies of the 5-min oscillations.

Key words: Sun: oscillations – chromosphere – MHD

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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