Results 51 to 60 of about 859 (172)

Variability and Spectra of AGN in the EUV and the Relation to Other Bands [PDF]

International Astronomical Union Colloquium, 1996
Data from several collaborations will be shown which demonstrate the utility of EUVE observations. For Mk 478, a Seyfert 1 galaxy, the rapidly variable EUV flux is shown to have a steep, featureless continuum. The EUV data are combined with UV and optical data to form an overall spectrum that is consistent with an accretion disk model; slight ...
openaire   +1 more source

Photoelectron pitch angle distribution near Mars and implications on cross terminator magnetic field connectivity

Earth and Planetary Physics, 2020
The photoelectron peak at 22–27 eV, a distinctive feature of the energetic electron distribution in the dayside Martian ionosphere, is a useful diagnostic of solar extreme ultraviolet (EUV) and X-ray ionization as well as of large-scale transport along ...
YuTian Cao, Jun Cui, XiaoShu Wu, JiaHao Zhong   +3 more
doaj   +1 more source

Advancing Heliophysics and Space Weather Modeling Through Open Science

Space Weather, Volume 24, Issue 6, June 2026.
Abstract We present a community‐wide effort to develop a strategy and action plan to advance heliophysics and space weather modeling through open science. While open science has the potential to enhance the quality and pace of scientific discovery, its application to scientific modeling requires more careful consideration regarding open data and open ...
C. Corti, M. M. Kuznetsova, M. A. Reiss, J. Yue, J. Karpen, C. N. Arge, F. Bacchini, C. Bard, S. Bruinsma, R. M. Caplan, L. K. S. Daldorff, P. J. Deka, C. R. DeVore, S. Elvidge, N. Ganushkina, J. D. Huba, B. V. Jackson, V. Jordanova, J. A. Linker, H. Liu, J. G. Luhmann, S. Markidis, P. Mayank, V. Merkin, N. Moens, D. Odstrcil, Y. A. Omelchenko, M. Palmroth, S. Poedts, A. J. Ridley, Y. Shou, V. Tenishev, D. R. Themens, G. Toth, W. Wang, R.‐P. Wilhelm, M. A. Young, B. Cecconi, M.‐Y. Chou, D. De Zeeuw, G. L. Delzanno, C. Didigu, M. El Alaoui, S. Fung, J. Green, Z. Huang, L. K. Jian, L. J. Landwer, M. Lesko, P. MacNeice, A. Masson, M. L. Mays, P. M. Mehta, M. S. Miesch, E. Palmerio, M. Petrenko, E. Provornikova, L. Rastätter, L. Rusaitis, N. Sachdeva, E. Samara, D. Sur, A. Taktakishvili, J. Topper, T. Tsui, C. Verbeke, J. Wang, C. Wiegand, M. Wiltberger, Y. Zheng, M. M. Bisi, M. K. Georgoulis, T. Kodikara, T. Pulkkinen, A. Chartier, D. da Silva, A. Faturahman, K. Garcia‐Sage, D. Kondrashov, V. E. Ledvina, W. Liu, C. Pandey, E. Resnick, C. Shi, R. S. Weigel, K. Whitman, I. Zakharenkova, K. Zhang   +87 more
wiley   +1 more source

EUV Spectra of Solar Flares from the EUV Spectroheliograph SPIRIT aboard CORONAS-F satellite

, 2015
We present detailed EUV spectra of 4 large solar flares: M5.6, X1.3, X3.4, and X17 classes in the spectral ranges 176-207 Å and 280-330 Å. These spectra were obtained {by the slitless} spectroheliograph SPIRIT aboard the CORONAS-F satellite. To our knowledge these are the first detailed EUV spectra of large flares obtained with spectral resolution of $\
Shestov, Sergey, Reva, Anton, Kuzin, Sergey   +2 more
openaire   +2 more sources

The Unusual UV Spectra of EUV-Discovered AM Herculis Stars [PDF]

International Astronomical Union Colloquium, 1996
International Ultraviolet Explorer observations of the ROSATWFC-discovered AM Hers RE2107–05, RE1938–46, RE1833–74, RE1149+28, and RE0751+14 reveal UV spectra (1200 – 2000 Å) which are unique when compared with previously studied systems. Specifically, the intensities of individual emission lines due to CIV, CII, N V, HeII, and Si IV, are 2 – 4 times ...
Adrienne E. Herzog, Steve B. Howell, Keith O. Mason   +2 more
openaire   +1 more source

JWST Detects Neon Line Variability in a Protoplanetary Disk

The Astrophysical Journal Letters, 2023
We report the first detection of variability in the mid-infrared neon line emission of a protoplanetary disk by comparing a JWST Mid-InfraRed Instrument Medium Resolution Spectrometer spectrum of SZ Cha taken in 2023 with a Spitzer Infrared Spectrograph ...
C. C. Espaillat, T. Thanathibodee, C. V. Pittman, J. A. Sturm, M. K. McClure, N. Calvet, F. M. Walter, R. Franco-Hernández, J. Muzerolle Page   +8 more
doaj   +1 more source

What Observations Would an Energetic Neutral Atom Imager Have Made During the Voyager 2 Flyby of Uranus?

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract We present large‐scale simulations of energetic neutral atom (ENA) emissions at Uranus from a spacecraft viewpoint. Models of magnetic field, extended hydrogen exosphere, moon‐sourced neutral tori, and proton radiation belt are implemented into a simulator to evaluate the production of ENAs for L $L$ = 1–15.
D. Santos‐Costa, N. André
wiley   +1 more source

Ionospheric response to solar EUV variations: Preliminary results [PDF]

Advances in Radio Science, 2018
We investigate the ionospheric response to solar Extreme Ultraviolet (EUV) variations using different proxies, based on solar EUV spectra observed from the Solar Extreme Ultraviolet Experiment (SEE) onboard the Thermosphere Ionosphere Mesosphere ...
R. Vaishnav, C. Jacobi, J. Berdermann, E. Schmölter, M. Codrescu   +4 more
doaj   +1 more source

Temporal Variability of Saturn's H2 Dayglow and Northern Aurora Observed by Hisaki and Cassini

Journal of Geophysical Research: Space Physics, Volume 131, Issue 6, June 2026.
Abstract Ultraviolet (UV) emissions from molecular hydrogen in Saturn's atmosphere consist of bright auroral emission over the poles and disk‐wide airglow. The dayside disk emits substantial intensities (dayglow) previously detected by various instruments.
L. S. Clare, S. V. Badman, T. Kimura, F. Tsuchiya, H. Tadokoro, C. Tao, Y. Kasaba, A. Bader, S. W. Farr, J. Kinrade, K. Yoshioka, A. Yamazaki, G. Murakami, I. Yoshikawa, H. Kita   +14 more
wiley   +1 more source

Characterization of charge state distributions in Near-Infrared Laser-Driven tin plasmas for efficient EUV generation

Results in Physics
In this paper, the charge state distributions of extreme ultraviolet (EUV) light source plasmas produced by near-infrared-wavelength lasers are systematically characterized.
Jang Hyeob Sohn, Hyun-Kyung Chung, Hyungyu Yu, Inki Jeong, Sang June Hahn, Young-Gui Yoon, Hyyong Suk, Byoung Ick Cho   +7 more
doaj   +1 more source