Low-frequency Magneto-acoustic Waves In The Solar Chromosphere
Abstract
We demonstrate that low-frequency (< 5 mHz) propagating magneto-acoustic waves provide a larger source of energy for balancing the radiative losses of the solar chromosphere than their high-frequency (> 5 mHz) counterparts. The low-frequency waves, which are normally evanescent in the solar atmosphere, are able to propagate through "acoustic portals” that exist in areas of strong, significantly inclined (> 30° with respect to the vertical), magnetic field. Such conditions are found both in active regions and at the boundaries of supergranules. The latter implies that acoustic portals are omnipresent over the solar surface and throughout the magnetic activity cycle, an essential prerequisite for any baseline heating mechanism.
- Publication:
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AAS/Solar Physics Division Meeting #37
- Pub Date:
- June 2006
- Bibcode:
- 2006SPD....37.0206F