Results 101 to 110 of about 3,680 (199)

Sun-as-a-star Observations of Obscuration Dimmings Caused by Filament Eruptions

The Astrophysical Journal
Filament eruptions often lead to coronal mass ejections (CMEs) on the Sun and are one of the most energetic eruptive phenomena in the atmospheres of other late-type stars.
Yu Xu, Hui Tian, Astrid M. Veronig, Karin Dissauer   +3 more
doaj   +1 more source

Astro2020 Science White Paper: Triggered High-Priority Observations of Dynamic Solar System Phenomena [PDF]

, 2019
Unexpected dynamic phenomena have surprised solar system observers in the past and have led to important discoveries about solar system workings. Observations at the initial stages of these events provide crucial information on the physical processes at ...
Bell, James F., Benecchi, Susan, Cartwright, Richard, Chanover, Nancy, Conrad, Al, de Kleer, Katherine, de Pater, Imke, Fry, Patrick, Gaidos, Eric, Giles, Rohini, Greathouse, Thomas, Hammel, Heidi, Hendrix, Amanda, Holler, Bryan, Lucas, Michael, Luszcz-Cook, Statia, Mandt, Kathleen, Meech, Karen, Milam, Stefanie, Nixon, Conor, Orton, Glenn, Otarola, Angel, Pinilla-Alonso, Noemi, Retherford, Kurt, Rivkin, Andy, Sayanagi, Kunio, Schwamb, Megan E., Simon, Amy, Tiscareno, Matthew, Trilling, David, Veillet, Christian, Verbiscer, Anne, Wong, Michael H.   +32 more
core   +1 more source

X-Ray, UV, and Optical Observations of Proxima Centauri’s Stellar Cycle

The Astrophysical Journal
Proxima Cen (GJ 551; dM5.5e) is one of only about a dozen fully convective stars known to have a stellar cycle, and the only one to have long-term X-ray monitoring.
Bradford J. Wargelin, Steven H. Saar, Zackery A. Irving, Jonathan D. Slavin, Peter Ratzlaff, José-Dias do Nascimento Jr   +5 more
doaj   +1 more source

Major scientific challenges and opportunities in understanding magnetic reconnection and related explosive phenomena throughout the universe [PDF]

, 2019
This is a group white paper of 100 authors (each with explicit permission via email) from 51 institutions on the topic of magnetic reconnection which is relevant to 6 thematic areas.
Alt, A., Antiochos, S., Ji, Hantao, Opher, Merav   +3 more
core  

High-time-cadence Spectroscopy and Photometry of Stellar Flares on M-dwarf YZ Canis Minoris with Seimei Telescope and TESS. II. Statistical Properties of Blue/Red Asymmetries in the Hα Line

The Astrophysical Journal
M-dwarfs frequently produce flares, and their associated coronal mass ejections (CMEs) may threaten the habitability of close-in exoplanets. M-dwarf flares sometimes show prominence eruption signatures, observed as blue/red asymmetries in the H α line ...
Yuto Kajikiya, Kosuke Namekata, Yuta Notsu, Kai Ikuta, Hiroyuki Maehara, Bunei Sato, Daisaku Nogami   +6 more
doaj   +1 more source

High-time-cadence Spectroscopy and Photometry of Stellar Flares on M dwarf YZ Canis Minoris with the Seimei Telescope and TESS. I. Discovery of Rapid and Short-duration Prominence Eruptions

The Astrophysical Journal
M dwarfs show frequent flares and associated coronal mass ejections (CMEs) may significantly impact close-in habitable planets. M dwarf flares sometimes show blue/red asymmetries in the H α line profile, suggesting prominence eruptions as an early stage ...
Yuto Kajikiya, Kosuke Namekata, Yuta Notsu, Hiroyuki Maehara, Bunei Sato, Daisaku Nogami   +5 more
doaj   +1 more source

Stellar Transformer Concepts: Solar Induction Driver of Natural Disasters Forecasting with Geophysical Intelligence [PDF]

Journal of Systemics, Cybernetics and Informatics, 2018
Understanding how Stellar Transformer Induction concepts explain Space Weather and Cosmic Ray links to our Solar System Endogenous Energy, Magnetic Moment, and Plasma Core Planetary Electronics with Geophysical Intelligence has become paramount for ...
Bruce Leybourne
doaj  

History of two mass loss processes in VY CMa. [PDF]

Proc Int Astron Union, 2023
Quintana-Lacaci G, Velilla L, Fonfría JP, Cernicharo J, Castro-Carrizo A, Agúndez M, Decin L.   +6 more
europepmc   +1 more source

Universal Constants in Self-organized Criticality Systems

The Astrophysical Journal
The occurrence frequency distributions of fluxes ( F ) and fluences or energies ( E ) observed in the majority (in 18 out of 23 cases) of astrophysical phenomena are found to be consistent with the predictions of the fractal-diffusive self-organized ...
Markus J. Aschwanden
doaj   +1 more source

Solar Particle Acceleration

Astronomy
High-energy particles may be accelerated widely in stellar coronae; probably by the same processes we find in the Sun. Here, we have learned of two physical mechanisms that dominate the acceleration of solar energetic particles (SEPs).
Donald V. Reames
doaj   +1 more source