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Context. Prominence eruptions provide key observations to understand the launch of coronal mass ejections as their cold plasma traces a part of the unstable magnetic configuration. Aims. We select a well observed case to derive…

Solar and Stellar Astrophysics · Physics 2021-03-24 Pooja Devi , Pascal Démoulin , Ramesh Chandra , Reetika Joshi , Brigitte Schmieder , Bhuwan Joshi

We report microwave spectral imaging observations of an erupting magnetic flux rope during the early impulsive phase of the X8.2-class limb flare on 2017 September 10, obtained by the Expanded Owens Valley Solar Array. A few days prior to…

Solar and Stellar Astrophysics · Physics 2020-06-10 Bin Chen , Sijie Yu , Katharine K. Reeves , Dale E. Gary

We study the energy release process of a set of 51 flares (32 confined, 19 eruptive) ranging from GOES class B3 to X17. We use H$\alpha$ filtergrams from Kanzelh\"ohe Observatory together with SDO HMI and SOHO MDI magnetograms to derive…

Solar and Stellar Astrophysics · Physics 2018-02-07 Johannes Tschernitz , Astrid M. Veronig , Julia K. Thalmann , Jürgen Hinterreiter , Werner Pötzi

Erupting magnetic flux ropes (MFRs) play a crucial role in producing solar flares. However, the formation of erupting MFRs in complex coronal magnetic configurations and their subsequent evolution in the flaring events are not fully…

Solar and Stellar Astrophysics · Physics 2023-08-30 Avijeet Prasad , Sanjay Kumar , Alphonse C. Sterling , Ronald L. Moore , Guillaume Aulanier , R. Bhattacharyya , Qiang Hu

Flare ribbons with parallel and circular morphologies are typically associated with different magnetic reconnection models, and the simultaneous observation of both types in a single event remains rare. Using multi-wavelength observations…

Solar and Stellar Astrophysics · Physics 2025-11-03 Ruifei Huang , Hao Ning , Ze Zhong , Ye Qiu , Zhenyong Hou , Yang Su , Chuan Li , Xiangliang Kong , Yao Chen

Self-organization in continuous systems is associated with dissipative processes. In particular, for magnetized plasmas, it is known as magnetic relaxation, where the magnetic energy is converted into heat and kinetic energy of flow through…

Solar and Stellar Astrophysics · Physics 2024-01-23 Satyam Agarwal , Ramit Bhattacharyya , Shangbin Yang

Theoretically, CME kinematics are related to magnetic reconnection processes in the solar corona. However, the current quantitative understanding of this relationship is based on the analysis of only a handful of events. Here we report a…

Solar and Stellar Astrophysics · Physics 2020-05-06 Chunming Zhu , Jiong Qiu , Paulett Liewer , Angelos Vourlidas , Michael Spiegel , Qiang Hu

We address a possibility of the flare process initiation and further maintenance of its energy release due to a transformation of sunspot longitudinal waves into transverse magnetic loop oscillations with initiation of reconnection. This…

Solar and Stellar Astrophysics · Physics 2015-05-20 R. Sych , M. Karlický , A. Altyntsev , J. Dudík , L. Kashapova

Using high-resolution images from 1.6 m New Solar Telescope (NST) at Big Bear Solar Observatory (BBSO), we report the direct evidence of chromospheric reconnection at the polarity inversion line (PIL) between two small opposite polarity…

Solar and Stellar Astrophysics · Physics 2015-08-19 Pankaj Kumar , Vasyl Yurchyshyn , Haimin Wang , Kyung-Suk Cho

Outflows perpendicular to the guide field are believed to be a possible signature of magnetic reconnection in the solar corona and specifically a way to detect the occurrence of ubiquitous small-angle magnetic reconnection. The aim of this…

Solar and Stellar Astrophysics · Physics 2025-03-05 G. Cozzo , P. Pagano , F. Reale , P. Testa , A. Petralia , J. Martinez-Sykora , V. Hansteen , B. De Pontieu

We analyse the observational characteristics for a set of Long Duration Events (LDE) using Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI). Excellent energy resolution (1 keV) of HXR images reconstructed with RHESSI allowed us…

Solar and Stellar Astrophysics · Physics 2015-03-19 Tomasz Mrozek , Zbigniew Koltun , Sylwester Kolomanski , Urszula Bak-Steslicka

Observational evidence is presented for the merging of a downward-propagating plasmoid with a looptop kernel during an occulted limb event on 2007 January 25. RHESSI lightcurves in the 9-18 keV energy range, as well as that of the 245 MHz…

Solar and Stellar Astrophysics · Physics 2015-05-18 Ryan O. Milligan , R. T. James McAteer , Brian R. Dennis , C. Alex Young

The commonly observed jets provide critical information on the small-scale energy release in the solar atmosphere. We report a near disk-center jet on 2010 July 20, observed by the Solar Dynamics Observatory. In this event, the standard…

Solar and Stellar Astrophysics · Physics 2015-05-28 Chang Liu , Na Deng , Rui Liu , Ignacio Ugarte-Urra , Shuo Wang , Haimin Wang

Flares are dynamic events which involve rapid changes in coronal magnetic topology end energy release. Even if they may be localized phenomena, the magnetic disturbance at their origin may propagate and be effective in a larger part of the…

Solar and Stellar Astrophysics · Physics 2010-10-18 S. Parenti , F. Reale , K. K. Reeves

We conduct a wide-band X-ray spectral analysis in the energy range of 1.5-100 keV to study the time evolution of the M7.6 class flare of 2016 July 23, with the Miniature X-ray Solar Spectrometer (MinXSS) CubeSat and the Reuven Ramaty High…

Solar and Stellar Astrophysics · Physics 2022-07-20 Shunsaku Nagasawa , Tomoko Kawate , Noriyuki Narukage , Tadayuki Takahashi , Amir Caspi , Thomas N. Woods

We firstly report the simultaneous activities of a slipping motion of flare loops and a slipping eruption of a flux rope in 131 {\AA} and 94 {\AA} channels on 2014 February 02. The east hook-like flare ribbon propagated slippingly at a…

Solar and Stellar Astrophysics · Physics 2015-06-22 Ting Li , Jun Zhang

We report on the formation of small solar flares produced by patchy magnetic reconnection between interacting magnetic loops. A three-dimensional (3D) magnetohydrodynamic (MHD) numerical experiment was performed, where a uniform magnetic…

Solar and Stellar Astrophysics · Physics 2015-06-19 V. Archontis , V. Hansteen

Solar flares are widely accepted to be powered by magnetic reconnection that involves complex dynamics in various scales. The flare supra-arcade and loop-top region, directly impacted by fast reconnection downflows, contains a wealth of…

Solar and Stellar Astrophysics · Physics 2025-05-27 Tingyu Gou , Katharine K. Reeves

Recent observations in extreme-ultraviolet (EUV) wavelengths reveal an EUV late phase in some solar flares, which is characterized by a second peak in the warm coronal emissions (about 3 MK) occurring several tens of minutes to a few hours…

Solar and Stellar Astrophysics · Physics 2023-07-19 Yuehong Chen , Yu Dai , Mingde Ding

Aims: This work aims to identify the mechanism driving pulsations in hard X-ray (HXR) and microwave emission during solar flares. Here, by using combined HXR and microwave observations from Solar Orbiter/STIX and EOVSA we investigate an…

Solar and Stellar Astrophysics · Physics 2024-05-01 Hannah Collier , Laura A. Hayes , Sijie Yu , Andrea F. Battaglia , William Ashfield , Vanessa Polito , Louise K. Harra , Säm Krucker
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