Our work “A Possible Mechanism for ‘Late Phase’ in Stellar White-Light Flares”, led by @KaiYang_42, has been accepted for publication! This is probably the most interesting project I’ve ever been a part of. You can now read it at: . A thread: (1/10)arxiv.org/abs/2310.19316 Kepler/TESS have found thousands of “super flares” on cool stars 100-10000x brighter than solar counterparts. The physics are thought to be the same: sudden release of magnetic energy. Super-flaring stars just have stronger magnetic fields and thus brighter flares. (2/10)

Our paper on solar near-surface meridional flow, led by @astrosushant, is now in press! By carefully removing active regions and their surroundings in helioseismic flow maps, we uncover a 3-component structure of this large-scale flow (1/5). arxiv.org/abs/2304.02158 The 1st component is a constant background flow, which is retrieved from long-term averaging of the non-active regions. The 2nd component is the two-band converging flow toward the activity belt. You can see these inflows clearly in the butterfly diagram below. (2/5)

Our group will be presenting five papers at AGU! Come and chat with us, either virtually or in Chicago! A 🧵 (1/7) Kai Yang (SH12D-1484) will report our progress on developing DL inversion algorithms for DKIST (funded by NSF/AAG). Kai has led the effort of creating a large library of MURaM simulation and synthetic Stokes profiles. Model training is underway. All data will be public! (2/7)

Paper Monday! I’m pleased to share our new work “Torus-stable zone above starspots”, an attempt to explain the “missing stellar CME conundrum”. It is accepted to MNRAS and now out on arXiv (arxiv.org/abs/2111.03665). A 🧵 (1/11) Super flares are frequently observed on cool stars, but stellar CMEs are rarely reported. This is surprising, because the flare-CME association rate increases with flare energy on the Sun. Almost all X-class solar flares are accompanied by a CME. (2/11)

Paper day! Led by IfA student Jonathan Lee, our work on the evolution of “bald patch” magnetic topology during a large solar flare is accepted to ApJL and now out on arXiv! (arxiv.org/abs/2111.00336) A 🧵. (1/7) Bald patch is a magnetic feature where U-shaped field lines turn tangent to the photosphere. When combined with shear, they suggest the presence of a low-lying magnetic flux rope. The field lines are thought to be loosely anchored in the photosphere. (2/7)

Our group will be presenting six papers at AGU! Come and chat with us, either virtually or in New Orleans! A 🧵 (1/8) Sushant Mahajan (SH54A-04) will discuss photospheric flows toward active regions based on time-distance helioseismology. We hope to parameterize them in a spatiotemporally resolved fashion for surface flux transport models. (2/8)

The second paper is from Anthony Pineci (arxiv.org/abs/2103.08887). We applied deep learning methods to infer AIA EUV He II 304 A intensity from SOLIS He I 10830 A equivalent width. EUV emission drives exoplanet atmosphere escape, but 1/6 can only be observed in space. On the other hand, the He I infrared line is physically associated the He II line, and is accessible from the ground. Its formation mechanism is complicated though, so a simple regression won’t work. 2/6

We have two student papers out on arXiv today! The first is from Anna Payne (arxiv.org/abs/2103.09087). We studied EUV dimming associated with flux emergence, which is termed “emerging dimming”. We used AIA and HMI data to probe its origin. 1/5 The dimming occurs only in 171 A, and coincides with brightening in 211 A. We performed DEM analysis on 18 events. The amount of sub-MK plasma decreases, and the 1-2 MK plasma increases. The changes are correlated over 8 orders of magnitude! 2/5