Acoustic oscillations in a field-free cavity under solar small-scale biploar magnetic canopy

David Kuridze, T. V. Zaqarashvili, Stefaan Poedts

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26 Citations (SciVal)
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Abstract

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.
Original languageEnglish
JournalAnnales Geophysicae
Volume26
Issue number10
DOIs
Publication statusPublished - 15 Oct 2008

Keywords

  • ionosphere (wave propagation)
  • solar physics
  • astrophysical and astronomy (photosphere and chromosphere)

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