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

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

2008-01-18

arxiv.org/abs/0801.2877v1

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, accepted in Annales Geophysicae

Scientific paper

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 ($m \geq 2$) harmonics can be easily trapped leading to the observed acoustic power halos under the canopy.

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