Results 131 to 140 of about 17,719 (230)

AD Leo from X-Rays to Radio: Are Flares Responsible for the Heating of Stellar Coronae?

, 2000
In spring 1999, a long coordinated observing campaign was performed on the flare star AD Leo, including {\it EUVE}, {\it BeppoSAX}, the {\it VLA}, and optical telescopes. The campaign covered a total of 44 days. We obtained high-quality light curves displaying ongoing variability on various timescales, raising interesting questions on the role of flare-
Guedel, M., Audard, M., Guinan, E. F., Drake, J. J., Kashyap, V. L., Mewe, R., Alekseev, I. Y.   +6 more
openaire   +2 more sources

Solar Energetic Particle Forecasting With Multi‐Task Deep Learning: SEPNET

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Solar energetic particle (SEP) events pose severe threats to spacecraft, astronaut safety, and aviation operations. Accurate SEP forecasting remains a critical challenge in space weather research as a result of their complex origins and highly variable propagation.
Yian Yu, Yang Chen, Lulu Zhao, Kathryn Whitman, Ward Manchester, Tamas Gombosi   +5 more
wiley   +1 more source

A Search for Star-Disk Interaction Among the Strongest X-ray Flaring Stars in the Orion Nebula Cluster

, 2010
The Chandra Orion Ultradeep Project observed hundreds of young, low-mass stars undergoing highly energetic X-ray flare events. The 32 most powerful cases have been modeled with the result that the magnetic structures responsible for these flares can be ...
Alicia N. Aarnio, Barsony, Camenzind, Carpenter, Cohen, Collier Cameron, Collier Cameron, Cousins, Cranmer, Da Rio, D’Alessio, Eisner, Eisner, Ercolano, Espaillat, Favata, Findeisen, Getman, Getman, Getman, Getman, Hartmann, Hauschildt, Hayashi, Hillenbrand, Isella, Keivan G. Stassun, Lada, Makidon, Najita, Press, Reale, Rebull, Rebull, Robberto, Robitaille, Robitaille, Sean P. Matt, Skrutskie, Stark, Stassun, Stassun, Uzdensky, Whitney, Whitney   +44 more
core   +1 more source

X-Ray Flares of Sun-Like Young Stellar Objects and Their Effects on Protoplanetary Disks

, 2005
Astronomical observations of flares from analogs of the early Sun have the potential to give critical insights into the high energy irradiation environment of protoplanetary disks. Solar-mass young stellar objects are significantly more X-ray luminous than the typical low-mass T Tauri star.
Glassgold, A. E., Feigelson, E. D., Momtmerle, T., Wolk, S.   +3 more
openaire   +2 more sources

Solar Energetic Particle Prediction in the Inner Heliosphere Using Deep Learning and PSP/IS⊙IS Data

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 3, June 2026.
Abstract Solar events, such as coronal mass ejections and solar flares, accelerate large numbers of energetic charged particles, producing solar energetic particle (SEP) events that can harm astronauts, damage satellites, and potentially damage infrastructure on Earth.
Tate Hutchins, Spiridon Kasapis, Hameedullah Farooki, Manuel E. Cuesta, Lengying Khoo, Sungmin Pak, Robert Czarnota, Jamie Rankin, Jamey Szalay, Zigong Xu, Georgios Livadiotis, Nikolaos Sarlis, David McComas   +12 more
wiley   +1 more source

High-velocity Blue-shifted Fe xxv Heα Line during a Superflare of the RS Canum Venaticorum–type Star IM Peg

The Astrophysical Journal Letters
The Monitor of All-sky X-ray Image (MAXI) detected a superflare, releasing 5 × 10 ^37 erg in 2−10 keV, of the RS CVn-type star IM Peg at 10:41 UT on 2023 July 23 with its Gas Slit Camera (2−30 keV).
Shun Inoue, Wataru Buz Iwakiri, Teruaki Enoto, Hiroyuki Uchida, Miki Kurihara, Masahiro Tsujimoto, Yuta Notsu, Kenji Hamaguchi, Keith Gendreau, Zaven Arzoumanian, Takeshi Go Tsuru   +10 more
doaj   +1 more source

LEO‐DOS Absorbed Dose Observations During the May 2024 Geomagnetic Superstorm

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract The Low‐Earth Orbit Space Radiation Dosimeter (LEO‐DOS) onboard Next‐Generation Satellite II (NEXTSat‐2) measured absorbed dose rate variations during the May 2024 geomagnetic superstorm. The observations show deep storm‐time penetration of solar energetic particle (SEP) spanning L ≈ 2–10, a pronounced enhancement near L ≈ 3 consistent with ...
Jongil Jung, Young‐Sil Kwak, Uk‐Won Nam, Suyeon Oh, Won‐Kee Park, Sukwon Youn, Jaeyoung Kwak, Jongdae Sohn, Bongkon Moon, Jaejin Lee, Sunghwan Kim, Sung‐Joon Ye   +11 more
wiley   +1 more source

An X-ray Survey of the Most Energetic Stellar Flares

An X-ray Survey of the Most Energetic Stellar Flares
【学位授与の要件】中央大学学位規則第4条第1項 【論文審査委員主査】坪井　陽子（中央大学理工学部教授） 【論文審査委員副査】中村　真（中央大学理工学部教授）、東條　賢（中央大学理工学部教授）、梅田　和昇（中央大学理工学部教授）、柴田　一成（同志社大学大学院理工学研究科客員教授） application ...
openaire   +1 more source

Spectral Analysis of the X-Ray Flares in the 2023 Outburst of the New Black Binary Transient Swift J1727.8–1613 Observed with Insight-HXMT

The Astrophysical Journal
The new black hole transient Swift J1727.8–1613 exhibited a series of X-ray flares during its 2023 outburst extensively observed with Insight-HXMT. We analyze the spectra of the flaring period using a series of models consisting of a multicolor disk and ...
Jia-Ying Cao, Jin-Yuan Liao, Shuang-Nan Zhang, Hua Feng, Jin-Lu Qu, Liang Zhang, He-Xin Liu, Wei Yu, Qing-Chang Zhao, Jing-Qiang Peng, Ming-Yu Ge, Lian Tao, Yan-Jun Xu, Shu Zhang, Zi-Xu Yang   +14 more
doaj   +1 more source

Impulsive solar X-ray bursts. 4: Polarization, directivity and spectrum of the reflected and total bremsstrahlung radiation from a beam of electrons directed toward the photosphere [PDF]

A Monte Carlo method is described for evaluation of the spectrum, directivity and polarization of X-rays diffusely reflected from stellar photospheres. the accuracy of the technique is evaluated through comparison with analytic results.
Langer, S. H., Petrosian, V.
core   +1 more source