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Astron. Astrophys. 354, 277-279 (2000)

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

II. Fine structure of the spectrum of 5-min oscillations

V.I. Zhukov

Central Astronomical Observatory Russian Academy of Sciences, 65 Pulkovo, 196 140 St. Petersburg, Russia (gnedin@pulkovo.spb.su)

Received 10 May 1999 / Accepted 15 October 1999

Abstract

The influence of magnetic field on the spectrum of 5-min solar oscillations has been investigated. The calculations have been made within a model of the two-layer shell. The lower non-magnetized layer is characterized by linear decrease of temperature with height while in the upper layer with homogeneous horizontal magnetic field temperature increase, and reaches a coronal value at the height of about 2500[FORMULA]. It is shown that, accounting for resonant absorption, the spectrum of 5-min oscillations has fine structure, which is most noticeable in high - degree modes.

Key words: Sun: oscillations – Sun: chromosphere – Magnetohydrodynamics (MHD)

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© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000
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