Bibcode
Santamaria, I. C.; Khomenko, E.; Collados, M.; de Vicente, A.
Bibliographical reference
Astronomy and Astrophysics, Volume 602, id.A43, 5 pp.
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6
2017
Journal
Citations
10
Refereed citations
9
Description
This work aims to understand the behavior of non-linear waves in the
vicinity of a coronal null point. In previous works we have shown that
high-frequency waves are generated in such a magnetic configuration.
This paper studies those waves in detail in order to provide a plausible
explanation of their generation. We demonstrate that slow
magneto-acoustic shock waves generated in the chromosphere propagate
through the null point and produce a train of secondary shocks that
escape along the field lines. A particular combination of the shock wave
speeds generates waves at a frequency of 80 mHz. We speculate that this
frequency may be sensitive to the atmospheric parameters in the corona
and therefore can be used to probe the structure of this solar layer.
Movies attached to Figs 2 and 4 are available at http://www.aanda.org
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