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Fast downflows in a chromospheric filament

Published online by Cambridge University Press:  24 September 2020

K. Sowmya Open the ORCID record for K. Sowmya [Opens in a new window] ,
A. Lagg ,
S. K. Solanki  and
J. S. Castellanos Durán
K. Sowmya
Affiliation:
Max-Planck-Institut für Sonnensystemforschung Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany email: [email protected]
A. Lagg
Affiliation:
Max-Planck-Institut für Sonnensystemforschung Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany email: [email protected]
S. K. Solanki
Affiliation:
Max-Planck-Institut für Sonnensystemforschung Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany email: [email protected] School of Space Research, Kyung Hee University, YongIn, Gyeonggi 446–701, Korea
J. S. Castellanos Durán
Affiliation:
Max-Planck-Institut für Sonnensystemforschung Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany email: [email protected]
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Abstract

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An active region filament in the upper chromosphere is studied using spectropolarimetric data in He i 10830 Å from the GREGOR telescope. A Milne-Eddingon based inversion of the Unno-Rachkovsky equations is used to retrieve the velocity and the magnetic field vector of the region. The plasma velocity reaches supersonic values closer to the feet of the filament barbs and coexist with a slow velocity component. Such supersonic velocities result from the acceleration of the plasma as it drains from the filament spine through the barbs. The line-of-sight magnetic fields have strengths below 200 G in the filament spine and in the filament barbs where fast downflows are located, their strengths range between 100 - 700 G.

Keywords

Sun: filamentsSun: chromosphereSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S354: Solar and Stellar Magnetic Fields: Origins and Manifestations , June 2019 , pp. 454 - 457
Copyright
© International Astronomical Union 2020

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