Wide-spectrum slow magnetoacoustic waves in coronal loops

A model interpreting variations of EUV brightness upward propagating in solar coronal loops as slow magnetoacoustic waves is developed. A loop is considered to have a non-zero plane inclination angle and offset of the circular loop centre from the baseline. The model also incorporates effects of dis...

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Veröffentlicht in:Astronomy and astrophysics (Berlin) 2001-12, Vol.379 (3), p.1106-1112
Hauptverfasser: Tsiklauri, D., Nakariakov, V. M.
Format: Artikel
Sprache:eng
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Zusammenfassung:A model interpreting variations of EUV brightness upward propagating in solar coronal loops as slow magnetoacoustic waves is developed. A loop is considered to have a non-zero plane inclination angle and offset of the circular loop centre from the baseline. The model also incorporates effects of dissipation and gravitational stratification. A linear evolutionary equation is derived and applied to investigations of slow wave dynamics. Both the non-zero plane inclination and the offset decrease the growth of the wave amplitude due to stratification. It is shown that wide-spectrum slow magnetoacoustic waves, consistent with currently available observations in the low frequency part of the spectrum, can provide a rate of heat deposition sufficient to heat the loop. In this scenario, the heat would be deposited near the loop footpoints, which agrees with the current observational data.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:20011378