Results 31 to 40 of about 3,680 (199)

Occurrence rate of stellar Type II radio bursts from a 100 star-year search for coronal mass ejections [PDF]

Astronomy & Astrophysics
Coronal mass ejections (CMEs) are major drivers of space weather in the Solar System, but their occurrence rate on other stars is unknown. A characteristic (deca-)metric radio burst with a time-frequency drift, known as a Type II radio burst, is a key observational signature of CMEs. We searched a total of 107 years of stellar data
David C. Konijn, H. K. Vedantham, Cyril Tasse, T. W. Shimwell, M. J. Hardcastle, J. R. Callingham, Ekaterina Ilin, A. Drabent, P. Zarka, F. van der Tak, Sanne Bloot   +10 more
  +6 more sources

Detection of Coronal Mass Ejections in V471 Tauri with the Hubble Space Telescope [PDF]

, 2001
V471 Tauri, an eclipsing system consisting of a hot DA white dwarf (WD) and a dK2 companion in a 12.5-hour orbit, is the prototype of the pre-cataclysmic binaries.
Arnaud M., banolu C., banolu C., D. J. Mullan, Edward M. Sion, Gould N. L., Howard E. Bond, M. Sean O’Brien, Tunca Z.   +8 more
core   +2 more sources

Unified Relationship between Cold Plasma Ejections and Flare Energies Ranging from Solar Microflares to Giant Stellar Flares

The Astrophysical Journal, 2023
We often find spectral signatures of chromospheric cold plasma ejections accompanied by flares in a wide range of spatial scales in the solar and stellar atmospheres.
Yuji Kotani, Kazunari Shibata, Takako T. Ishii, Daiki Yamasaki, Kenichi Otsuji, Kiyoshi Ichimoto, Ayumi Asai   +6 more
doaj   +1 more source

Where are the stellar coronal mass ejections?

, 2022
Stellar flares and coronal mass ejections (CMEs) can have serious effects on their surroundings: they can erode or completely destroy atmospheres of orbiting planets over time and also have high importance in stellar evolution. Most of the stellar CME detections in the literature are single events found serendipitously sparse for statistical ...
Vida, K., Kriskovics, L, Leitzinger, M., Odert, P., Greimel, R., Seli, B., Görgei, A., Kővári, Zs., Oláh, K.   +8 more
openaire   +1 more source

The effect of a stellar magnetic variation on the jet velocity [PDF]

, 2008
Stellar jets are normally constituted by chains of knots with some periodicity in their spatial distribution, corresponding to a variability of order of several years in the ejection from the protostar/disk system.
Armitage P. J., Blandford R. D., Canto J., Casse F., Fabio De Colle, Ferreira J., Gareth Murphy, José Gracia, Lovelace R. V. E., Micono M.   +9 more
core   +4 more sources

High energy laser & systems to neutralise stellar coronal mass ejections (CME) plasma

Aeronautics and Aerospace Open Access Journal
With CME plasma and shockwave travelling at 600+ km/sec, active methods such as high energy electron lasers (HEL) and mirrors are effective at making contact with ionised atoms in CME. Electrons pulsed from kW to MW laser(s) could polarise ionised atoms such as Fe16+, O7/8+, Mg, He2+,etc to fill valence pairs.
Kolemann Lutz, Terry Trevino
openalex   +2 more sources

Looking for the elusive stellar coronal mass ejections. How can LOFAR help?

, 2022
Abstract: Coronal mass ejections (CMEs) are the most explosive manifestations of stellar magnetic activity. In the solar case, CMEs and flares are associated with each other and this association increases with increasing flaring energy, reaching 100% for high energies. But does this hold true for other stars?
Antonova, Antoaneta, Avramova-Bioncheva, Antoaneta, Korhonen, Heidi, Doyle, J.G, Rigney, Jeremy, Stateva, Ivanka   +5 more
openaire   +2 more sources

Could we identify hot Ocean-Planets with CoRoT, Kepler and Doppler velocimetry? [PDF]

, 2007
Planets less massive than about 10 MEarth are expected to have no massive H-He atmosphere and a cometary composition (50% rocks, 50% water, by mass) provided they formed beyond the snowline of protoplanetary disks.
A. Léger, Alibert, Alonso, B. Chazelas, Baraffe, Baraffe, Barman, Bordé, Bouchy, C. Moutou, C. Sotin, Chassefiére, Cox, D. Despois, D. Ehrenreich, D. Mawet, Di Benedetto, Ehrenreich, F. Bouchy, F. Brachet, F. Selsis, Fortney, Grießmeier, Grießmeier, H. Lammer, J.-M. Grießmeier, J.F. Kasting, Kasting, Kervella, Khodachenko, Kuchner, Lammer, Lovis, Léger, Léger, M. Decaudin, M. Deleuil, M. Ollivier, Mayor, Moutou, O'Donovan, O. Grasset, P. Barge, P. Bordé, Pepe, Press, Protanov, Rafikov, Raymond, Raymond, Raymond, Ribas, Rouan, Santos, Sato, Terada, Tian, Valencia, Vidal-Madjar, Vidal-Madjar, Watson, Wood, Wood, Yelle   +63 more
core   +5 more sources

Solar–Stellar Connection: X-Ray Flares to Energetic (E > 10 MeV) Particle Events

The Astrophysical Journal, 2023
Energetic particle environments are an important factor for the viability of life on exoplanets surrounding flare stars. In the heliosphere, large gradual solar energetic ( E > 10 MeV) particle (SEP) events are produced by shocks from fast coronal mass ...
S. W. Kahler, A. G. Ling
doaj   +1 more source

Why coronal mass ejections are necessary for the dynamo [PDF]

, 2006
Large scale dynamo-generated fields are a combination of interlocked poloidal and toroidal fields. Such fields possess magnetic helicity that needs to be regenerated and destroyed during each cycle.
Axel Brandenburg, Brandenburg, Brandenburg, Shukurov   +3 more
core   +2 more sources