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Flares are intense explosions on the solar and stellar surfaces, and solar flares are sometimes accompanied by filament or prominence eruptions. Recently, a large filament eruption associated with a superflare on a solar-type star EK Dra…

太阳与恒星天体物理 · 物理学 2024-01-10 Kai Ikuta , Kazunari Shibata

Solar flares are caused by magnetic eruptions in active regions (ARs) on the surface of the sun. These events can have significant impacts on human activity, many of which can be mitigated with enough advance warning from good forecasts. To…

太阳与恒星天体物理 · 物理学 2023-09-18 Varad Deshmukh , Thomas Berger , James Meiss , Elizabeth Bradley

Solar flare forecasting mainly relies on photospheric magnetograms and associated physical features to predict forthcoming flares. However, it is believed that flare initiation mechanisms often originate in the chromosphere and the lower…

太阳与恒星天体物理 · 物理学 2024-10-22 Grégoire Francisco , Sabrina Guastavino , Teresa Barata , João Fernandes , Dario Del Moro

In this paper, we revisit the problem of clustering 1318 new variable stars found in the Milky way. Our recent work distinguishes these stars based on their light curves which are univariate series of brightness from the stars observed at…

应用统计 · 统计学 2022-02-23 Soumita Modak , Tanuka Chattopadhyay , Asis Kumar Chattopadhyay

New instrumental and telescopes covering the optical and ultra-violet spectral regions have revealed a range of small-scale dynamic features, many which may be related. For example, the range of spicule-like features hints towards a…

太阳与恒星天体物理 · 物理学 2023-08-02 Nived Vilangot Nhalil , Juie Shetye , J. Gerry Doyle

We study intensity variations, as measured by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory (SDO), in a solar coronal arcade using a newly developed analysis procedure that employs spatio-temporal…

太阳与恒星天体物理 · 物理学 2019-07-24 Farhad Allian , Rekha Jain , B. W Hindman

A method for real-time solar flare detection and characterization using ground-based Very Low Frequency (VLF, 15-45 kHz) data is presented. The D-region, the ionosphere's lowest region, is monitored by VLF waves propagating in the…

天体物理仪器与方法 · 物理学 2026-05-13 Pauline Teysseyre , Carine Briand , Morris Cohen

We analyse the spatial distribution and vertical stratification of the physical parameters of the solar atmosphere when an X-class flare occurs. We made use of observations acquired by the Interferometric Bidimensional Spectropolarimeter…

太阳与恒星天体物理 · 物理学 2024-06-19 F. Ferrente , C. Quintero Noda , F. Zuccarello , S. L. Guglielmino

Context. Accurate detections of frequent small-scale extreme ultraviolet (EUV) brightenings are essential to the investigation of the physical processes heating the corona. Aims. We detected small-scale brightenings, termed campfires, using…

Neutrinos generated during solar flares remain elusive. However, after $50$ years of discussion and search, the potential knowledge unleashed by their discovery keeps the search crucial. Neutrinos associated with solar flares provide…

太阳与恒星天体物理 · 物理学 2020-10-12 K. Okamoto , Y. Nakano , S. Masuda , Y. Itow , M. Miyake , T. Terasawa , S. Ito , M. Nakahata

Solar flares - bursts of high-energy radiation responsible for severe space-weather effects - are a consequence of the occasional destabilization of magnetic fields rooted in active regions (ARs). The complexity of AR evolution is a barrier…

太阳与恒星天体物理 · 物理学 2019-05-27 Dattaraj B. Dhuri , Shravan M. Hanasoge , Mark C. M. Cheung

We developed a solar flare prediction model using a deep neural network (DNN), named Deep Flare Net (DeFN). The model can calculate the probability of flares occurring in the following 24 h in each active region, which is used to determine…

太阳与恒星天体物理 · 物理学 2018-05-23 Naoto Nishizuka , Komei Sugiura , Yuki Kubo , Mitsue Den , Mamoru Ishii

Solar flares are major space weather events that result from the explosive conversion of stored magnetic energy into bulk motion, plasma heating, and particle acceleration. While the standard flare model has proven highly successful in…

太阳与恒星天体物理 · 物理学 2025-10-09 Joel T. Dahlin , Spiro K. Antiochos , Peter F. Wyper , Jiong Qiu , C. Richard DeVore

The chromospheric response to the input of flare energy is marked by extended extreme ultraviolet (EUV) ribbons and hard X-ray (HXR) footpoints. These are usually explained as the result of heating and bremsstrahlung emission from…

太阳与恒星天体物理 · 物理学 2016-01-20 Paulo J. A. Simões , David R. Graham , Lyndsay Fletcher

While solar flares are primarily associated with enhanced ultraviolet and X-ray emission, a subset of flares exhibit significant continuum brightening in visible light and are classified as white-light flares (WLFs). Despite extensive…

太阳与恒星天体物理 · 物理学 2026-01-01 Samuel Granovsky , Alexander G. Kosovichev , Irina N. Kitiashvili , Alan A. Wray

Solar flares are explosive releases of magnetic energy stored in the solar corona, driven by magnetic reconnection. These events accelerate electrons, generating hard X-ray emissions and often display Quasi Periodic Pulsations (QPPs) across…

太阳与恒星天体物理 · 物理学 2025-11-25 Luiz A. C. A. Schiavo , Natasha L. S. Jeffrey , Gert J. J. Botha , James A. McLaughlin

We consider the problem of automatically (and robustly) isolating and extracting information about waves and oscillations observed in EUV image sequences of the solar corona with a view to near real-time application to data from the…

天体物理学 · 物理学 2009-11-13 Scott W. McIntosh , Bart De Pontieu , Steven Tomczyk

Time series of photospheric magnetic parameters of solar active regions (ARs) are used to answer whether scaling properties of fluctuations embedded in such time series help to distinguish between flare-quiet and flaring ARs. We examine a…

太阳与恒星天体物理 · 物理学 2020-10-21 Eo-Jin Lee , Sung-Hong Park , Yong-Jae Moon

We investigate the characteristics of the solar flares complex network. The limited predictability, non-linearity, and self-organized criticality of the flares allow us to study systems of flares in the field of the complex systems. Both…

太阳与恒星天体物理 · 物理学 2017-10-04 Akbar Gheibi , Hossein Safari , Mohsen Javaherian

The slowly positively drifting bursts (SPDBs) are rarely observed in radio emission of solar flares. To understand how the SPDBs are generated, we studied the radio observations at 600--5000 MHz together with the imaging observations made…

太阳与恒星天体物理 · 物理学 2024-08-23 Alena Zemanová , Marian Karlický , Jana Kašparová , Jaroslav Dudík , Ján Rybák