Slipping reconnection in a solar flare observed in high resolution with the GREGOR solar telescope

被引：7

作者：

Sobotka, M. ^{[1
]}

Dudik, J. ^{[1
]}

Denker, C. ^{[2
]}

Balthasar, H. ^{[2
]}

Jurcak, J. ^{[1
]}

Liu, W. ^{[1
]}

Berkefeld, T. ^{[3
]}

Collados Vera, M. ^{[4
]}

Feller, A. ^{[5
]}

Hofmann, A. ^{[2
]}

Kneer, F. ^{[6
]}

Kuckein, C. ^{[2
]}

Lagg, A. ^{[5
]}

Louis, R. E. ^{[2
]}

von der Luehe, O. ^{[3
]}

Nicklas, H. ^{[6
]}

Schlichenmaier, R. ^{[3
]}

Schmidt, D. ^{[7
]}

Schmidt, W. ^{[3
]}

Sigwarth, M. ^{[3
]}

Solanki, S. K. ^{[5
,8
]}

Soltau, D. ^{[3
]}

Staude, J. ^{[2
]}

Strassmeier, K. G. ^{[2
]}

Volkmer, R. ^{[3
]}

Waldmann, T. ^{[3
]}

机构：

[1] Acad Sci Czech Republ, Inst Astron, Fricova 298, CS-25165 Ondrejov, Czech Republic

[2] Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany

[3] Kiepenheuer Inst Solar Phys, Schoneckstr 6, D-79104 Freiburg, Germany

[4] Inst Astrofis Canarias, Via Lactea, Tenerife 38200, Spain

[5] Max Planck Inst Solar Syst Res, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[6] Georg August Univ, Inst Astrophys, Friedrich Hund Pl 1, D-37077 Gottingen, Germany

[7] Natl Solar Observ, 3010 Coronal Loop, Sunspot, NM 88349 USA

[8] Kyung Hee Univ, Sch Space Res, Yongin 446701, Gyeonggi Do, South Korea

来源：

ASTRONOMY & ASTROPHYSICS | 2016年 / 596卷

关键词：

Sun: flares; Sun: chromosphere; QUASI-SEPARATRIX LAYERS; MAGNETIC RECONNECTION; RUNNING RECONNECTION; RIBBONS; CORONA; MODEL;

D O I：

10.1051/0004-6361/201527966

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A small flare ribbon above a sunspot umbra in active region 12205 was observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the 1.5 m GREGOR telescope, using a 1 angstrom Ca II H interference filter. Context observations from the Atmospheric Imaging Assembly (AIA) onboard the Solar Dynamics Observatory (SDO), the Solar Optical Telescope (SOT) onboard Hinode, and the Interface Region Imaging Spectrograph (IRIS) show that this ribbon is part of a larger one that extends through the neighboring positive polarities and also participates in several other flares within the active region. We reconstructed a time series of 140 s of Ca II H images by means of the multiframe blind deconvolution method, which resulted in spatial and temporal resolutions of 0.1 '' and 1 s. Light curves and horizontal velocities of small-scale bright knots in the observed flare ribbon were measured. Some knots are stationary, but three move along the ribbon with speeds of 7-11 km s(-1). Two of them move in the opposite direction and exhibit highly correlated intensity changes, which provides evidence of a slipping reconnection at small spatial scales.

引用

页数：6

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