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A swirling flare-related EUV jet View all abstracts by submitter

Qingmin Zhang   Submitted: 2013-12-06 03:29

{We report our observations of a swirling flare-related EUV jet on 2011 October 15 at the edge of NOAA active region 11314.} {We utilised the multiwavelength observations in the extreme-ultraviolet (EUV) passbands from the Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory (SDO). We extracted a wide slit along the jet axis and 12 thin slits across its axis to investigate the longitudinal motion and transverse rotation. We also used data from the Extreme-Ultraviolet Imager (EUVI) aboard the Solar TErrestrial RElations Observatory (STEREO) spacecraft to investigate the three-dimensional (3D) structure of the jet. Gound-based Hα images from the El Teide as a member of the Global Oscillation Network Group (GONG) provide a good opportunity to explore the relationship between the cool surge and hot jet. Line-of-sight magnetograms from the Helioseismic and Magnetic Imager (HMI) aboard SDO enable us to study the magnetic evolution of the flare/jet event. We carried out potential-field extrapolation to figure out the magnetic configuration associated with the jet.} {The onset of jet eruption coincided with the start time of C1.6 flare impulsive phase. The initial velocity and acceleration of the longitudinal motion were 254pm10 km s-1 and -97pm5 m s-2, respectively. The jet presented helical structure and transverse swirling motion at the beginning of its eruption. The counter-clockwise rotation slowed down from an average velocity of sim122 km s-1 to sim80 km s-1. The interwinding thick threads of the jet untwisted into multiple thin threads during the rotation that lasted for 1 cycle with a period of sim7 min and an amplitude that increases from sim3.2 Mm at the bottom to sim11 Mm at the upper part. Afterwards, the curtain-like leading edge of the jet continued rising without rotation, leaving a dimming region behind before falling back to the solar surface. The appearance/disappearance of dimming corresponded to the longitudinal ascending/descending motions of jet. Cospatial Hα surge and EUV dimming imply that the dimming resulted from the absorption of hot EUV emission by cool surge. The flare/jet event was caused by continuous magnetic cancellation before the start of flare. The jet was associated with the open magnetic fields at the edge of AR 11314.}

Authors: Q. M. Zhang and H. S. Ji
Projects: None

Publication Status: accepted by A&A
Last Modified: 2013-12-06 11:37
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