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On 2005 September 13 a filament eruption accompanied by a halo CME occurred in the most flare-productive active region NOAA 10808 in Solar Cycle 23. Using multi-wavelength observations before the filament eruption on Sep. 13th, we…

We carried out a multi-wavelength study of a CME and a medium-size 1B/C1.3 flare occurring on 12 May 1997. We present the investigation of magnetic-field variations in the NOAA Active Region 8038 which was observed on the Sun during 7--16…

Solar and Stellar Astrophysics · Physics 2011-06-15 Rajmal Jain , Arun K. Awasthi , Babita Chandel , Lokesh Bharti , Y. Hanaoka , A. L. Kiplinger

We analyze the formation mechanism of three homologous broad coronal mass ejections (CMEs) resulting from a series of solar blowout-eruption flares with successively increasing intensities (M2.0, M2.6, and X1.0). The flares originated from…

Solar and Stellar Astrophysics · Physics 2022-05-18 Suraj Sahu , Bhuwan Joshi , Alphonse C. Sterling , Prabir K. Mitra , Ronald L. Moore

NOAA Active Region (AR) 13664/8 produced the most intense geomagnetic effects since the ``Halloween'' event of 2003. The resulting extreme solar storm is believed to be the consequence of multiple interacting coronal mass ejections (CMEs).…

Solar and Stellar Astrophysics · Physics 2024-12-04 Rui Wang , Ying D. Liu , Xiaowei Zhao , Huidong Hu

We present multi-wavelength analysis of an eruption event that occurred in Active Region (AR) NOAA 11093 on 7 August 2010, using data obtained from SDO, STEREO, RHESSI and GONG H$\alpha$ network telescope. From these observations, we…

Solar and Stellar Astrophysics · Physics 2015-05-27 P. Vemareddy , R. A. Maurya , A. Ambastha

We present the results of a detailed analysis of multi-wavelength observations of a very impulsive solar flare 1B/M6.7, which occurred on 10 March, 2001 in NOAA AR 9368 (N27 W42). The observations show that the flare is very impulsive with…

We analyze two flare events which occurred in active region NOAA 501 on November 20, 2003. The H-alpha and magnetogram measurements show interaction between two filaments which produced a slowly rising flare event, corresponding to two…

Solar and Stellar Astrophysics · Physics 2015-05-13 P. Kumar , P. K. Manoharan , W. Uddin

We study a filament eruption, two-ribbon flare, and coronal mass ejection (CME) that occurred in Active Region NOAA 10898 on 6 July 2006. The filament was located South of a strong sunspot that dominated the region. In the evolution leading…

Solar and Stellar Astrophysics · Physics 2014-01-14 Tibor Török , Manuela Temmer , Gherardo Valori , Astrid Veronig , Lidia van Driel-Gesztelyi , Bojan Vršnak

We present a clear case study on the occurrence of two successive X-class flares including a decade-class flare (X9.3) and two coronal mass ejections (CMEs) triggered by shearing motion and sunspot rotation in active region NOAA 12673 on…

Solar and Stellar Astrophysics · Physics 2018-04-11 X. L. Yan , J. C. Wang , G. M. Pan , D. F. Kong , Z. K. Xue , L. H. Yang , Q. L. Li , X. S. Feng

Utilizing multiwavelength observations and magnetic field data from SDO/AIA, SDO/HMI, GOES and RHESSI, we investigate a large-scale ejective solar eruption of 2014 December 18 from active region NOAA 12241. This event produced a distinctive…

Solar and Stellar Astrophysics · Physics 2017-08-23 Navin Chandra Joshi , Alphonse C. Sterling , Ronald L. Moore , Tetsuya Magara , Young-Jae Moon

The nature of various plausible causal links between sympathetic events is still a controversial issue. In this work, we present multi-wavelength observations of sympathetic eruptions, associated flares and coronal mass ejections (CMEs)…

Solar and Stellar Astrophysics · Physics 2016-04-13 Navin Chandra Joshi , Brigitte Schmieder , Tetsuya Magara , Yang Guo , Guillaume Aulanier

From 2018 Oct 12 to 13, three successive solar eruptions (E1--E3) with B-class flares and poor white light coronal mass ejections (CMEs) occurred from the same active region NOAA AR 12724. Interestingly, the first two eruptions are…

Solar and Stellar Astrophysics · Physics 2020-05-01 Suli Ma , Huadong Chen

Solar active regions (ARs) are the main sources of flares and coronal mass ejections (CMEs). NOAA AR 12089, which emerged on 2014 June 10, produced two C-class flares accompanied by CMEs within five hours after its emergence. When producing…

Solar and Stellar Astrophysics · Physics 2024-10-02 Hanzhao Yang , Lijuan Liu

Filament eruptions often result in flares and coronal mass ejections (CMEs). Most studies attribute the filament eruptions to their instabilities or magnetic reconnection. In this study, we report a unique observation of a filament eruption…

Solar and Stellar Astrophysics · Physics 2024-05-24 Yongliang Song , Jiangtao Su , Qingmin Zhang , Mei Zhang , Yuanyong Deng , Xianyong Bai , Suo Liu , Xiao Yang , Jie Chen , Haiqing Xu , Kaifan Ji , Ziyao Hu

Solar flares and coronal mass ejections (CMEs) are closely coupled through magnetic reconnection. CMEs are usually accelerated impulsively within the low solar corona, synchronized with the impulsive flare energy release. We investigate the…

Homologous flares are flares that occur repetitively in the same active region, with similar structure and morphology. A series of at least eight homologous flares occurred in active region NOAA 11237 over 16 - 17 June 2011. A nearby…

Solar and Stellar Astrophysics · Physics 2015-09-23 Navdeep K. Panesar , Alphonse C. Sterling , Davina E. Innes , Ronald L. Moore

On 2022 March 28 two successive coronal mass ejections (CMEs) were observed by multiple spacecraft and resulted in a magnetic cloud (MC) at 1 AU. We investigate the propagation and interaction properties of the two CMEs correlated with the…

Space Physics · Physics 2024-06-21 Chong Chen , Ying D. Liu , Bei Zhu , Huidong Hu , Rui Wang

We study magnetic field evolution in AR12371 relating its successive eruptive nature. During the disk transit of seven days, the AR launched four sequential fast coronal mass ejections (CMEs) associated with long duration M-class flares.…

Solar and Stellar Astrophysics · Physics 2017-09-29 P. Vemareddy

Observations show that the mutual relationship between filament eruptions and solar flares cannot be described in terms of an unique scenario. In some cases, the eruption of a filament appears to trigger a flare, while in others the…

Solar and Stellar Astrophysics · Physics 2014-12-08 Fatima Rubio da Costa , Francesca Zuccarello , Lyndsay Fletcher , Paolo Romano , Nicolas Labrosse

On 2010 August 14, a wide-angled coronal mass ejection (CME) was observed. This solar eruption originated from a destabilized filament that connected two active regions and the unwinding of this filament gave the eruption an untwisting…

Solar and Stellar Astrophysics · Physics 2017-02-01 Elke D'Huys , Daniel B. Seaton , Anik De Groof , David Berghmans , Stefaan Poedts
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