Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 819, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8205/819/2/L23
Keywords
hydrodynamics; Sun: atmosphere; waves
Categories
Funding
- German Academic Exchange Service DAAD
- NSF [AGS 1246074]
- Alexander von Humboldt Foundation
- European Research Council under the European Union's Seventh Framework Program [307117]
- Solarnet project - European Commission's FP7 Capacities Programme [312495]
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Direct evidence for the existence of an acoustic cutoff frequency in the solar atmosphere is given by observations performed by using the HELioseismological Large Regions Interferometric DEvice operating on the Vacuum Tower Telescope located on Tenerife. The observational results demonstrate variations of the cutoff with atmospheric heights. The observed variations of the cutoff are compared to theoretical predictions made by using five acoustic cutoff frequencies that have been commonly used in helioseismology and asteroseismology. The comparison shows that none of the theoretical predictions is fully consistent with the observational data. The implication of this finding is far reaching as it urgently requires either major revisions of the existing methods of finding acoustic cutoff frequencies or developing new methods that would much better. account. for the physical picture underlying the concept of cutoff frequencies in inhomogeneous media.
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