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Remote coronal dimmings related to a circular-ribbon flare View all abstracts by submitter

Qingmin Zhang   Submitted: 2019-12-25 04:26

{} {In this paper, we report multiwavelength observations of remote coronal dimmings related to an M1.1 circular-ribbon flare (CRF) in active region (AR) 12434.} {The confined flare without a coronal mass ejection (CME) was observed by the Atmospheric Imaging Assembly (AIA) and the Helioseismic and Magnetic Imager (HMI) on board the Solar Dynamics Observatory (SDO) on 2015 October 16. We obtained global three-dimensional (3D) magnetic fields before the flare using the potential field source surface modeling.} {A few minutes before the flare hard X-ray peak time (06:13:48 UT), small-scale, weak dimming appeared ~240" away from the flare site, which can be observed by AIA only in 131 and 171 Å. Afterward, long and narrow dimmings became evident in all AIA extreme-ultraviolet passbands except 304 Å, while localized core dimming was not clearly observed near the flare site. The large-area dimmings extended southeastward and the areas increased gradually. The total area of dimmings reaches (1.2±0.4)x104 Mm2 in 193 Å. The maximal relative intensity decreases in 171 and 193 Å reach 90% and 80%, respectively. Subsequently, the dimmings began to replenish and the area decreased slowly, lasting for ≥3 hr. The remote dimmings and AR 12434 are connected by large-scale coronal loops. The remote dimmings are associated with the southwest footpoints of coronal loops with weak negative polarities. Possible origins of remote dimmings are discussed.} {}

Authors: Q. M. Zhang and R. S. Zheng
Projects: None

Publication Status: accepted for publication in A&A
Last Modified: 2019-12-25 10:19
Go to main E-Print page  Fine-scale Explosive Energy Release at Sites of Prospective Magnetic Flux Cancellation in the Core of the Solar Active Region Observed by Hi-C 2.1, IRIS, and SDO   Formation and Eruption of a Mini-sigmoid Originating in Coronal Hole  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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