Coronal Mini-jets in an Activated Solar Tornado-like Prominence
Chen,Huadong1,2; Zhang,Jun1,3; De Pontieu,Bart4; Ma,Suli1; Kliem,Bernhard5; Priest,Eric6
Source PublicationThe Astrophysical Journal
AbstractAbstract High-resolution observations from the Interface Region Imaging Spectrometer reveal the existence of a particular type of small solar jet, which arose singly or in clusters from a tornado-like prominence suspended in the corona. In this study, we perform a detailed statistical analysis of 43 selected mini-jets in the tornado event. Our results show that the mini-jets typically have (1) a projected length of 1.0–6.0 Mm, (2) a width of 0.2–1.0 Mm, (3) a lifetime of 10–50 s, (4) a velocity of 100–350 km s?1, and (5) an acceleration of 3–20 km s?2. Based on spectral diagnostics and EM-Loci analysis, these jets seem to be multithermal small-scale plasma ejections with an estimated average electron density of ~2.4?×?1010 cm?3 and an approximate mean temperature of ~2.6?×?105 K. Their mean kinetic energy density, thermal energy density, and dissipated magnetic field strength are roughly estimated to be ~9 erg cm?3, 3 erg cm?3, and 16 G, respectively. The accelerations of the mini-jets, the UV and EUV brightenings at the footpoints of some mini-jets, and the activation of the host prominence suggest that the tornado mini-jets are probably created by fine-scale external or internal magnetic reconnections (a) between the prominence field and the enveloping or background field or (b) between twisted or braided flux tubes within the prominence. The observations provide insight into the geometry of such reconnection events in the corona and have implications for the structure of the prominence magnetic field and the instability that is responsible for the eruption of prominences and coronal mass ejections.
KeywordThe Sun Solar activity Solar prominences
WOS IDIOP:0004-637X-899-1-ab9cad
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.CAS Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China,
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3.School of Physics and Materials Science, Anhui University, Hefei 230601, People’s Republic of China
4.Lockheed Martin Solar and Astrophysics Laboratory, Palo Alto, CA 94304, USA
5.Institute of Physics and Astronomy, University of Potsdam, Potsdam D-14476, Germany
6.School of Mathematics and Statistics, University of St Andrews, St. Andrews, Fife KY16 9SS, UK
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Chen,Huadong,Zhang,Jun,De Pontieu,Bart,et al. Coronal Mini-jets in an Activated Solar Tornado-like Prominence[J]. The Astrophysical Journal,2020,899(1).
APA Chen,Huadong,Zhang,Jun,De Pontieu,Bart,Ma,Suli,Kliem,Bernhard,&Priest,Eric.(2020).Coronal Mini-jets in an Activated Solar Tornado-like Prominence.The Astrophysical Journal,899(1).
MLA Chen,Huadong,et al."Coronal Mini-jets in an Activated Solar Tornado-like Prominence".The Astrophysical Journal 899.1(2020).
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