Fast downflows in a chromospheric filament

K. Sowmya, A. Lagg, S. K. Solanki, J. S. Castellanos Durán

Research output: Contribution to journalArticleScientific

Abstract

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....
Original languageEnglish
JournalPROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION
DOIs
Publication statusPublished - Dec 2020
MoE publication typeB1 Article in a scientific magazine

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