Results 121 to 130 of about 6,507,263 (232)

Are the recently observed soft gamma-ray bursts from stellar super flares? [PDF]

, 1963
The discovery of soft gamma ray bursts has led to the speculation that these bursts are caused by the bremsstrahlung of electrons accelerated to high energies in a stellar flare event.
Stecker, F. W., Frost, K. J.
core  

Unexpected X-ray flares

, 2016
Two sources of highly energetic flares have been discovered in archival X-ray data of 70 nearby galaxies. These flares have an undetermined origin and might represent previously unknown astrophysical phenomena.
Sergio Campana, CAMPANA, Sergio
core   +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   +3 more sources

Gamma-Ray Burst Timing: Decoding the Hidden Slow Jets in GRB 060729

The Astrophysical Journal Letters
Gamma-ray bursts (GRBs) are luminous stellar explosions characterized by the ejection of relativistic jets. This work proposes a novel paradigm to study these GRB jets. By analyzing the timing information of prompt pulses and X-ray flares, in conjunction
Jin-Jun Geng, Ding-Fang Hu, Hao-Xuan Gao, Yi-Fang Liang, Yan-Long Hua, Guo-Rui Zhang, Tian-Rui Sun, Bing Li, Yuan-Qi Liu, Fan Xu, Chen Deng, Chen-Ran Hu, Ming Xu, Yong-Feng Huang, Miao-Miao Zhang, Min Fang, Jing-Zhi Yan, Tao An, Xue-Feng Wu   +18 more
doaj   +1 more source

Unmanned Aerial Systems for Corrosion Detection: Multi‐Sensor Technologies, Challenges, and Opportunities for Next‐Generation Inspection

Quality and Reliability Engineering International, Volume 42, Issue 6, Page 3565-3583, October 2026.
ABSTRACT Corrosion remains a critical threat to the integrity and service life of infrastructure in industries such as oil, gas, construction, renewable energy, and transportation. Traditional inspection methods, being labor‐intensive, hazardous, and often subjective, fall short in addressing modern inspection demands.
Alhossein Alharbi, Yunes Alqudsi, Alhasan Ali Alharbi, Mohammed Basheer Mohiuddin   +3 more
wiley   +1 more source

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

Multiwavelength Campaign Observations of a Young Solar-type Star, EK Draconis. III. Comparison between Starspot Mapping, Zeeman Doppler Imaging, and Multiwavelength Variability

The Astrophysical Journal
Recent simultaneous multiwavelength observations of a nearby young solar-type star EK Draconis (EK Dra) in the optical, H α spectrum, and X-ray, have provided evidence for stellar prominence eruptions associated with superflares.
Kai Ikuta, Kosuke Namekata, Pascal Petit, Vladimir S. Airapetian, Hiroyuki Maehara, Yuta Notsu, Aline A. Vidotto, Keith Gendreau, Sandra V. Jeffers, Stephen Marsden, Julien Morin, Coralie Neiner, Rishi R. Paudel, Daisaku Nogami, Kazunari Shibata   +14 more
doaj   +1 more source

The high energy X-ray probe (HEX-P): Resolving the nature of Sgr A* flares, compact object binaries and diffuse X-ray emission in the Galactic center and beyond

Frontiers in Astronomy and Space Sciences
HEX-P is a probe-class mission concept that will combine high spatial resolution X-ray imaging (<10″ FWHM) and broad spectral coverage (0.2–80 keV) with an effective area far superior to current facilities’ (including XMM-Newton and NuSTAR).
Kaya Mori, Gabriele Ponti, Gabriele Ponti, Matteo Bachetti, Arash Bodaghee, Jonathan Grindlay, Jaesub Hong, Roman Krivonos, Ekaterina Kuznetsova, Shifra Mandel, Antonio Rodriguez, Giovanni Stel, Shuo Zhang, Tong Bao, Franz Bauer, Maïca Clavel, Benjamin Coughenour, Javier A. García, Julian Gerber, Brian Grefenstette, Amruta Jaodand, Bret Lehmer, Kristin Madsen, Melania Nynka, Peter Predehl, Ciro Salcedo, Daniel Stern, John Tomsick   +27 more
doaj   +1 more source

Quark-Nova Explosion inside a Collapsar: Application to Gamma Ray Bursts

Advances in Astronomy, 2009
If a quark-nova occurs inside a collapsar, the interaction between the quark-nova ejecta (relativistic iron-rich chunks) and the collapsar envelope leads to features indicative of those observed in Gamma Ray Bursts.
Rachid Ouyed, Denis Leahy, Jan Staff, Brian Niebergal   +3 more
doaj   +1 more source

Sensitization of OSL Signals in Quartz and Provenance Implications: Insights From Multi‐Spectroscopic Analysis of Quartz From Multiple Geological Settings

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 10, October 2026.
Abstract Quartz optically stimulated luminescence (OSL) sensitivity and electron spin resonance (ESR) signals have been empirically proposed as indicators of sediment provenance. OSL sensitivity is defined as luminescence produced per unit dose (Gray: Gy) per unit mass (mg).
Monika Devi, Serban‐Constantin Grecu, Zsejke‐Réka Tóth, Daniela Constantin, Daniela Brezeanu, Anca Barla, Ion Nesterovschi, Simona Cinta‐Pinzaru, Mihai N. Ducea, Stephen J. Mojzsis, Alida Timar   +10 more
wiley   +1 more source