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Evidence for Wave Heating of the Quiet-Sun Corona

Michael Hahn; Daniel Wolf Savin

Title:
Evidence for Wave Heating of the Quiet-Sun Corona
Author(s):
Hahn, Michael
Savin, Daniel Wolf
Date:
Type:
Articles
Department(s):
Astrophysics Laboratory
Volume:
795
Persistent URL:
Book/Journal Title:
The Astrophysical Journal
Abstract:
We have measured the energy and dissipation of Alfvénic waves in the quiet Sun. A magnetic field model was used to infer the location and orientation of the magnetic field lines along which the waves are expected to travel. The waves were measured using spectral lines to infer the wave amplitude. The waves cause a non-thermal broadening of the spectral lines, which can be expressed as a non-thermal velocity v nt. By combining the spectroscopic measurements with this magnetic field model, we were able to trace the variation of v nt along the magnetic field. At each footpoint of the quiet-Sun loops, we find that waves inject an energy flux in the range of 1.3-5.5 × 105 erg cm–2 s–1. At the minimum of this range, this amounts to more than 80% of the energy needed to heat the quiet Sun. We also find that these waves are dissipated over a region centered on the top of the loops. The position along the loop where the damping begins is strongly correlated with the length of the loop, implying that the damping mechanism depends on the global loop properties rather than on local collisional dissipation.
Subject(s):
Magnetohydrodynamic waves
Sun's corona
Spectrum analysis
Astrophysics
Publisher DOI:
https://doi.org/10.1088/0004-637X/795/2/111
Item views
38
Metadata:
text | xml
Suggested Citation:
Michael Hahn, Daniel Wolf Savin, , Evidence for Wave Heating of the Quiet-Sun Corona, Columbia University Academic Commons, .

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