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Explosive Chromospheric Evaporation in a Circular-ribbon Flare View all abstracts by submitter

Qingmin Zhang   Submitted: 2016-05-10 21:13

In this paper, we report our multiwavelength observations of the C4.2 circular-ribbon flare in active region (AR) 12434 on 2015 October 16. The short-lived flare was associated with positive magnetic polarities and a negative polarity inside, as revealed by the photospheric line-of-sight magnetograms. Such magnetic pattern is strongly indicative of a magnetic null point and spine-fan configuration in the corona. The flare was triggered by the eruption of a mini-filament residing in the AR, which produced the inner flare ribbon (IFR) and the southern part of a closed circular flare ribbon (CFR). When the eruptive filament reached the null point, it triggered null point magnetic reconnection with the ambient open field and generated the bright CFR and a blowout jet. Raster observations of the Interface Region Imaging Spectrograph (IRIS) show plasma upflow at speed of 35-120 km s-1 in the Fe XXI 1354.09 Å line (log T≈7.05) and downflow at speed of 10-60 km s-1 in the Si IV 1393.77 Å line (log T≈4.8) at certain locations of the CFR and IFR during the impulsive phase of flare, indicating explosive chromospheric evaporation. Coincidence of the single HXR source at 12-25 keV with the IFR and calculation based on the thick-target model suggest that the explosive evaporation was most probably driven by nonthermal electrons.

Authors: Q. M. Zhang, D. Li, Z. J. Ning, Y. N. Su, H. S. Ji and Y. Guo
Projects: IRIS

Publication Status: Accepted for publication in ApJ
Last Modified: 2016-05-11 08:52
Go to main E-Print page  Interaction of Two Filament Channels of Different Chiralities  The Formation and Early Evolution of a Coronal Mass Ejection and its Associated Shock Wave on 2014 January 8  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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