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Related papers: Estimating the coronal supra-arcade downflows radi…

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Context. Supra-arcade downflows (SADs) have been frequently observed during the gradual phase of solar flares near the limb. In coronal emission lines sensitive to flaring plasmas, they appear as tadpole-like dark voids against the diffuse…

Solar and Stellar Astrophysics · Physics 2017-10-18 Xin Chen , Rui Liu , Na Deng , Haimin Wang

Despite their somewhat-frequent appearance in EUV imaging of off-limb flares, the origins of Supra-Arcade Downflows (SADs) remain a mystery. Appearing as dark, tendril-like downflows above growing flare loop arcades, SADs themselves are yet…

Solar and Stellar Astrophysics · Physics 2025-05-29 Ryan J. French , Maria D. Kazachenko , Teodora Mihailescu , Katharine K. Reeves

Supra-arcade downflows (SADs) are dark voids descending through plasma above the post-flare arcade. Although they are generally viewed as byproducts of flare reconnections in the corona, the nature of SADs is under debate. Here we…

Solar and Stellar Astrophysics · Physics 2022-12-28 Arun Kumar Awasthi , Rui Liu , Tingyu Gou

Sunward-flowing voids above post-coronal mass ejection (CME) flare arcades were first discovered using the soft X-ray telescope (SXT) aboard Yohkoh and have since been observed with TRACE (extreme ultra-violet (EUV)), SOHO/LASCO (white…

Solar and Stellar Astrophysics · Physics 2015-05-27 Sabrina L. Savage , David E. McKenzie

Sunward-flowing voids above post-coronal mass ejection flare arcades, also known as supra-arcade downflows (SADs), have characteristics consistent with post-reconnection magnetic flux tube cross-sections. Applying semi-automatic detection…

Solar and Stellar Astrophysics · Physics 2012-01-26 Sabrina Savage , David McKenzie

Following the eruption of a filament from a flaring active region, sunward-flowing voids are often seen above developing post-eruption arcades. First discovered using the soft X-ray telescope aboard Yohkoh, these supra-arcade downflows…

Solar and Stellar Astrophysics · Physics 2015-06-03 Sabrina L. Savage , David E. McKenzie , Katharine K. Reeves

Supra-arcade downflows (SADs) are dark, teardrop-shaped features descending upon flare arcades. They are thought to be the results of magnetic reconnection, but the detailed formation mechanism of SADs and their relationship to flare energy…

Solar and Stellar Astrophysics · Physics 2020-08-05 Jianchao Xue , Yang Su , Hui Li , Xiaozhou Zhao

Coronal supra-arcade downflows (SADs) are observed as dark trails descending towards hot turbulent fan shaped regions. Due to the large temperature values, and gradients in these fan regions the thermal conduction should be very efficient.…

Solar and Stellar Astrophysics · Physics 2020-04-22 E. Zurbriggen , A. Costa , A. Esquivel , M. Schneiter , M. Cécere

Supra-arcade downflows (SADs) are dark structures descending towards post-reconnection flare loops observed in extreme ultraviolet or X-ray observations and are closely related to magnetic reconnection during solar flares. Due to the lack…

Solar and Stellar Astrophysics · Physics 2022-09-14 Guangyu Tan , Yijun Hou , Hui Tian

Supra-arcade downflows (SADs) are dark voids descending towards the post-reconnection flare loops and exhibit obvious variation in properties like width. However, due to the lack of further statistical studies, the mechanism behind such…

Solar and Stellar Astrophysics · Physics 2023-05-03 Guangyu Tan , Yijun Hou , Hui Tian

Solar flares are rapid energy release phenomena that appear as bright ribbons in the chromosphere and high-temperature loops in the corona, respectively. Supra-arcade Downflows (SADs) are plasma voids that first come out above the flare…

Solar and Stellar Astrophysics · Physics 2021-07-21 Z. F. Li , X. Cheng , M. D. Ding , Katharine K. Reeves , DeOndre Kittrell , Mark Weber , David E. McKenzie

A model of supra-arcade downflows (SADs), dark low density regions also known as tadpoles that propagate sunward during solar flares, is presented. It is argued that the regions of low density are flow channels carved by sunward-directed…

Space Physics · Physics 2015-06-16 P. A. Cassak , J. F. Drake , J. T. Gosling , T. -D. Phan , M. A. Shay , L. S. Shepherd

Supra-arcade downflows (SADs) are dark, sunward-moving structures above the arcade of flare loops. Naturally they are considered to be associated with outflows resulting from magnetic reconnection at the vertical current sheet beneath the…

Solar and Stellar Astrophysics · Physics 2025-08-08 Zichao Yang , Rui Liu

Supra-arcade fans are bright, irregular regions of emission that develop during eruptive flares, above flare arcades. The underlying flare arcades are thought to be a consequence of magnetic reconnection along a current sheet in the corona.…

Solar and Stellar Astrophysics · Physics 2015-06-18 Davina Innes , Lijia Guo , Amitava Bhattacharjee , Yi-Min Huang , Don Schmit

Supra-arcade downflows (SADs) are sunward, generally dark, plasma density depletions originated above posteruption flare arcades. In this paper using 3D MHD simulations we investigate if the SAD cavities can be produced by a direct…

Solar and Stellar Astrophysics · Physics 2015-05-12 M. Cécere , E. Zurbriggen , A. Costa , M. Schneiter

Plasma loops or plumes rooted in sunspot umbrae often harbor downflows with speeds of 100 km/s. These downflows are supersonic at transition region temperatures of 0.1 MK. The source of these flows is not well understood. We aim to…

Solar and Stellar Astrophysics · Physics 2022-03-16 Hechao Chen , Hui Tian , Leping Li , Hardi Peter , Lakshmi Pradeep Chitta , Zhenyong Hou

We perform a detailed analysis of the thermal structure of the region above the post-eruption arcade for a flare that occurred on 2011 October 22. During this event, a sheet of hot plasma is visible above the flare loops in the 131 \AA\…

Solar and Stellar Astrophysics · Physics 2017-02-15 Katharine K. Reeves , Michael S. Freed , David E. McKenzie , Sabrina L. Savage

We investigate the aftermath of a giant quiescent solar filament eruption on December 24, 2023. One feature of the eruption is an extensive fan above the filament channel that is about three times as wide as similar structures that appear…

Solar and Stellar Astrophysics · Physics 2025-09-15 Xiaoyan Xie , Katharine Reeves , Chengcai Shen , Nishu Karna , Yan Xu , Christopher Moore , Crisel Suarez , Ritesh Patel , Daniel Seaton

Supra-arcade downflows (SADs) and supra-arcade downflowing loops (SADLs) descending from reconnection regions toward solar post-flare arcades seem to be two different observational signatures of retracting, isolated reconnected flux tubes…

Solar and Stellar Astrophysics · Physics 2011-06-09 Silvina E. Guidoni

We investigate a small-scale ($\approx$ 1.5 Mm along the slit), supersonic downflow of about 90 km s$^{-1}$ in the transition region above the light-bridged sunspot umbra in AR 11836. The observations were obtained with the Interface Region…

Solar and Stellar Astrophysics · Physics 2015-10-21 Thomas Straus , Bernhard Fleck , Vincenzo Andretta
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