Investigation of recurrent EUV jets from highly dynamic magnetic field region
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- 作者：Navin Chandra Joshi ; Ramesh Chandra ; Yang Guo…
- 关键词：Sun ; flares ; Sun ; magnetic fields ; Sun ; general
- 刊名：Astrophysics and Space Science
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：362
- 期：1
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Astrophysics and Astroparticles; Astronomy, Observations and Techniques; Cosmology; Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics); Astrobiology;
- 出版者：Springer Netherlands
- ISSN：1572-946X
- 卷排序：362
文摘
In this work, we present observations and interpretations of recurrent extreme ultraviolet (EUV) jets that occurred between 2012 July 1 21:00 UT and 2012 July 2 10:00 UT from the western edge of the NOAA active region 11513. Solar Dynamics Observatory/Atmospheric Imaging Assembly (SDO/AIA), SDO/Helioseismic and Magnetic Imager (SDO/HMI) and Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) observations have been used for the present study. Observations as well as potential-field source-surface (PFSS) extrapolation suggest an open field configuration in the vicinity of the jet activity area. 18 EUV jets were observed from the western edge of the active region along the open field channel. All the jet events appeared to be non-homologous and show different morphological properties and evolution. Some of the jets were small and narrow in size while the others were huge and wide. The average speed of these jets ranges from \({\sim}47\mbox{ to }{\sim}308~\mbox{km}\,\mbox{s}^{-1}\). SDO/AIA 171 Å intensity profiles at the base of these jets show bumps corresponding to each jet, which is an evidence of recurrent magnetic reconnections. The magnetic field observation at the foot points of the jets revealed a very complex and dynamic magnetic activity which includes flux emergence, flux cancellation, dynamic motions, merging, separation, etc. We suggest that the recurrent jets are the result of recurrent magnetic reconnections among the various emerging bipolar fields themselves as well as with the open fields.