Results 71 to 80 of about 53,020 (220)

X-ray emission from solar neighbourhood flare stars [PDF]

Symposium - International Astronomical Union, 1990
A brief summary is given of a comprehensive analysis of EXOSAT observations of solar neighbourhood flare stars. Special attention is devoted to the discussion of quiescent X-ray emission and time variability.
R. Pallavicini, L. Stella, G. Tagliaferri   +2 more
openaire   +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

Searching for Rapid Pulsations in Solar Flare X-Ray Data

The Astrophysical Journal
Most studies of quasiperiodic pulsations (QPPs) in solar flares have identified characteristic periods in the 5–300 s range. Due to observational limitations, there have been few attempts to probe the
Andrew R. Inglis, Laura A. Hayes
doaj   +1 more source

Why Autonomous Vehicles Are Not Ready Yet: A Multi‐Disciplinary Review of Problems, Attempted Solutions, and Future Directions

Journal of Field Robotics, Volume 43, Issue 3, Page 2254-2341, May 2026.
ABSTRACT Personal autonomous vehicles can sense their surrounding environment, plan their route, and drive with little or no involvement of human drivers. Despite the latest technological advancements and the hopeful announcements made by leading entrepreneurs, to date no personal vehicle is approved for road circulation in a “fully” or “semi ...
Xingshuai Dong, Massimiliano Cappuccio, Fady Alnajjar, Luqman Ali, Hamad Al Jassmi, Essam Debie, Milad Ghasrikhouzani, Alessandro Lanteri, Tate McGregor, Oleksandra Molloy, Alice Plebe, Michael Regan, Eduardo Sandoval, Dongmo Zhang   +13 more
wiley   +1 more source

Constraining the Mass Loss and the Kinetic Energy of Stellar Coronal Mass Ejections with Solar Far-ultraviolet Flares

The Astrophysical Journal
Stellar eruptive events, such as flares and coronal mass ejections (CMEs), can affect planetary habitability by disturbing the stability of their atmospheres.
Nuri Park, Evgenya L. Shkolnik, Joe Llama   +2 more
doaj   +1 more source

Study of Positive Lightning Discharges in WWLLN Data Using Extremely Low Frequency Electromagnetic Wave Measurements

Earth and Space Science, Volume 13, Issue 5, May 2026.
Abstract An automatic procedure for identification of VLF detected lightning discharges in Extremely Low Frequency (ELF) measurements is presented to enable large scale analysis of global lightning and ELF propagation properties which are determined by the lower ionosphere.
Z. Nieckarz, M. Ostrowski, M. Gołkowski, J. Lichtenberger, J. Mlynarczyk, J. Kubisz, A. Michalec   +6 more
wiley   +1 more source

Soft X‐Ray Emission From Saturn's Magnetosheath II: Solar Wind Driving

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Saturn's magnetosphere is dominated by Enceladus‐sourced neutrals, which spread throughout the system into the magnetosheath. The neutrals can charge exchange with highly charged solar wind ions, causing soft X‐ray emission (<2 ${< } 2$ keV) upon de‐excitation of the ion.
D. Naylor, L. C. Ray, P. C. Rogan, W. R. Dunn, H. T. Smith   +4 more
wiley   +1 more source

Electrons and X-Ray Emission of Solar Flares [PDF]

Symposium - International Astronomical Union, 1990
A statistical analysis of solar flare X-rays and interplanetary particle fluxes, measured onboard VENERA-13, 14 Spacecraft, was performed. The correlation of fluences for different manifestations of solar flares is strong, especially for fast electrons and hard and soft X-ray emissions. Frequency dependence on fluence value ϵi for practically all Kinds
openaire   +1 more source

High-resolution X-ray spectra of solar flares. VI - Impulsive soft X-ray flares

The Astrophysical Journal, 1982
Doschek et al. (1980) and Feldman et al. (1980) have discussed high-resolution soft X-ray spectra of solar flares. The present investigation is concerned with the characteristics of the impulsive events as observed in soft X rays and the cooling of the flare plasma in terms of energy loss processes.
U. Feldman, G. A. Doschek, R. W. Kreplin
openaire   +1 more source

Height and Energy Evolution of X-Ray Double Sources in a Solar Flare

The Astrophysical Journal
In the standard model, magnetic reconnection at a vertical current sheet above the flare arcade is key to explaining many aspects of solar eruptions. The supra-arcade region is where the vertical current sheet is supposedly located, and X-ray/extreme ...
Hanya Pan, Astrid M. Veronig, Rui Liu
doaj   +1 more source