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Flare occurrence on the Sun is highly variable, exhibiting both short term variation due to the emergence and evolution of active regions, and long-term variation from the solar cycle. On solar-like stars, much larger stellar flares…

Solar and Stellar Astrophysics · Physics 2023-01-04 James Crowley , Michael S. Wheatland , Kai Yang

The accurate forecasting of solar flares is considered a key goal within the solar physics and space weather communities. There is significant potential for flare prediction to be improved by incorporating topological fluxes of magnetogram…

Solar and Stellar Astrophysics · Physics 2024-12-06 Thomas Williams , Christopher B. Prior , David MacTaggart

The solar group at the National Astronomical Observatory of Japan is conducting synoptic solar observations with the Solar Flare Telescope. While it is a part of a long-term solar monitoring, contributing to the study of solar dynamo…

Solar and Stellar Astrophysics · Physics 2020-09-29 Yoichiro Hanaoka , Takashi Sakurai , Ken'ichi Otsuji , Isao Suzuki , Satoshi Morita

Filaments are very common physical phenomena on the Sun and are often taken as important proxies of solar magnetic activities. The study of filaments has become a hot topic in the space weather research. For a more comprehensive…

This study progresses solar flare prediction research by presenting a full-disk deep-learning model to forecast $\geq$M-class solar flares and evaluating its efficacy on both central (within $\pm$70$^\circ$) and near-limb (beyond…

Solar and Stellar Astrophysics · Physics 2023-08-31 Chetraj Pandey , Anli Ji , Trisha Nandakumar , Rafal A. Angryk , Berkay Aydin

Solar flare X-ray emission results from rapidly increasing temperatures and emission measures in flaring active region loops. To date, observations from the X-Ray Sensor (XRS) onboard the Geostationary Operational Environmental Satellite…

Solar and Stellar Astrophysics · Physics 2013-03-07 Daniel F. Ryan , Ryan O. Milligan , Peter T. Gallagher , Brian R. Dennis , A. Kim Tolbert , Richard A. Schwartz , C. Alex Young

The coming years will see routine use of solar data of unprecedented spatial and spectral resolution, time cadence, and completeness in the wavelength domain. To capitalize on the soon to be available radio facilities such as the expanded…

Solar and Stellar Astrophysics · Physics 2015-05-20 Gregory D. Fleishman , Gelu M. Nita , Dale E. Gary

Strong solar magnetic fields are the energy source of intense flares and energetic coronal mass ejections of space weather importance. The key issue is the difficulty in predicting the occurrence time and location of strong solar eruptions,…

Solar and Stellar Astrophysics · Physics 2023-07-04 P. K. Manoharan , C. J. Salter , S. M. White , P. Perillat , F. Fernandez , B. Perera , A. Venkataraman , C. Brum

The dynamo theory has always been one of the biggest mysteries in stellar physics. One key reason for its uncertainty is poor knowledge of the dynamo process on stars except the Sun. The most important observation feature of solar dynamo is…

Solar and Stellar Astrophysics · Physics 2025-03-05 Huiqin Yang , Xin Cheng , Jifeng Liu , Shuai Liu , Zhanhao Zhao , Guiping Zhou , Yijun Hou , Changliang Gao , Zexi Niu

Solar flares occur due to the sudden release of energy stored in active-region magnetic fields. To date, the pre-cursors to flaring are still not fully understood, although there is evidence that flaring is related to changes in the…

Solar and Stellar Astrophysics · Physics 2012-02-01 Sophie A. Murray , D. Shaun Bloomfield , Peter T. Gallagher

Stellar flares are abundant in space photometric light curves. As they are now available in large enough numbers, the statistical study of their overall temporal morphology is timely. We use light curves from the Transiting Exoplanet Survey…

Solar and Stellar Astrophysics · Physics 2025-02-12 Bálint Seli , Krisztián Vida , Katalin Oláh , Anna Görgei , Szabolcs Soós , András Pál , Levente Kriskovics , Zsolt Kővári

Most flares on the Sun occur at random, but there is a small percentage of "sympathetic flaring" -- the triggering of one flare by another. Previously there had been no widespread confirmation of sympathetic flares on other stars. In this…

Solar and Stellar Astrophysics · Physics 2026-02-25 Veronica Pratt , Jason R. Reeves , David V. Martin , Andy B. Zhang , Andrew Korkus , S. Edelman

Multivariate time series classification is increasingly investigated in space weather research as a means to predict intense solar flare events, which can cause widespread disruptions across modern technological systems. Magnetic field…

Machine Learning · Computer Science 2025-11-18 Onur Vural , Shah Muhammad Hamdi , Soukaina Filali Boubrahimi

We conduct a post hoc analysis of solar flare predictions made by a Long Short Term Memory (LSTM) model employing data in the form of Space-weather HMI Active Region Patches (SHARP) parameters calculated from data in proximity to the…

Solar and Stellar Astrophysics · Physics 2020-03-11 Hu Sun , Ward Manchester , Zhenbang Jiao , Xiantong Wang , Yang Chen

Starspots and flares are indicators of stellar magnetic activity that can both be studied in greater detail by utilizing the long-term, space-based archive of the Kepler satellite. Here, we aim to investigate a subset of the Kepler archive…

Solar and Stellar Astrophysics · Physics 2018-11-28 Rachael M. Roettenbacher , Krisztián Vida

The application of machine learning in solar physics has the potential to greatly enhance our understanding of the complex processes that take place in the atmosphere of the Sun. By using techniques such as deep learning, we are now in the…

Solar and Stellar Astrophysics · Physics 2023-06-28 A. Asensio Ramos , M. C. M. Cheung , I. Chifu , R. Gafeira

Solar flares and CMEs have a broad range of magnitudes. This review discusses the possibility of "extreme events," defined as those with magnitudes greater than have been seen in the existing historical record. For most quantitative…

Solar and Stellar Astrophysics · Physics 2015-09-02 Hugh S. Hudson

In this study we determine scaling relationships of observed solar flares that can be used to predict upper limits of the GOES-class magnitude of solar flares. The flare prediction scheme is based on the scaling of the slowly-varying…

Solar and Stellar Astrophysics · Physics 2020-07-15 Markus J. Aschwanden
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