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Spectroscopic Observations of Magnetic Reconnection and Chromospheric Evaporation in an X-shaped Solar Flare View all abstracts by submitter

Ying Li   Submitted: 2017-08-29 20:40

We present observations of distinct UV spectral properties at different locations during an atypical X-shaped flare (SOL2014-11-09T15:32) observed by the Interface Region Imaging Spectrograph (IRIS). In this flare, four chromospheric ribbons appear and converge at an X-point where a separator is anchored. Above the X-point, two sets of non-coplanar coronal loops approach laterally and reconnect at the separator. The IRIS slit was located close to the X-point, cutting across some of the flare ribbons and loops. Near the location of the separator, the Si IV 1402.77 Å line exhibits significantly broadened line wings extending to 200 km s-1 but an unshifted line core. These spectral features suggest the presence of bidirectional flows possibly related to the separator reconnection. While at the flare ribbons, the hot Fe XXI 1354.08 Å line shows blueshifts and the cool Si IV 1402.77 A, C II 1335.71 A, and Mg II 2803.52 A lines show evident redshifts up to a velocity of 80 km s-1, which are consistent with the scenario of chromospheric evaporation/condensation.

Authors: Y. Li, M. Kelly, M. D. Ding, J. Qiu, X. S. Zhu, W. Q. Gan
Projects: IRIS

Publication Status: ApJ accepted.
Last Modified: 2017-08-30 12:29
Go to main E-Print page  Observations of Reconnection Flows in a Flare on the Solar Disk  Earth-Affecting Coronal Mass Ejections Without Obvious Low Coronal Signatures  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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