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| Titel |
Acoustic oscillations in a field-free cavity under solar small-scale bipolar magnetic canopy |
| VerfasserIn |
D. Kuridze, T. V. Zaqarashvili, B. M. Shergelashvili, S. Poedts |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 10 ; Nr. 26, no. 10 (2008-10-15), S.2983-2989 |
| Datensatznummer |
250016245
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| Publikation (Nr.) |
 copernicus.org/angeo-26-2983-2008.pdf |
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| Zusammenfassung |
| Observations show the increase of high-frequency wave power near
magnetic network cores and active regions in the solar lower
atmosphere. This phenomenon can be explained by the interaction of
acoustic waves with a magnetic field. We consider small-scale,
bipolar, magnetic field canopy structure near the network cores and
active regions overlying field-free cylindrical cavities of the
photosphere. Solving the plasma equations we get the analytical
dispersion relation of acoustic oscillations in the field-free
cavity area. We found that the m=1 mode, where m is azimuthal
wave number, cannot be trapped under the canopy due to energy
leakage upwards. However, higher (m≥2) harmonics can be
easily trapped leading to the observed acoustic power halos under
the canopy. |
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