Results 21 to 30 of about 3,640 (192)

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

Solar Coronal Mass Ejections Plasma Diagnostics Expressed as Potential Stellar CME Signatures

The Astronomical Journal, 2022
Abstract Solar coronal mass ejections (CMEs) have a strong association with solar flares that is not fully understood. This characteristic of our Sun’s magnetic activity may also occur on other stars, but the lack of successfully detected stellar CMEs makes it difficult to perform statistical studies that might show a similar association
Maurice L. Wilson, John C. Raymond
openaire   +1 more source

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

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

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

The quest for stellar coronal mass ejections in late-type stars [PDF]

Astronomy & Astrophysics, 2019
International ...
Vida, Krisztián, Leitzinger, Martin, Kriskovics, Levente, Seli, Bálint, Odert, Petra, Kovács, Orsolya Eszter, Korhonen, Heidi, van Driel-Gesztelyi, Lidia   +7 more
openaire   +6 more sources

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

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

Simulating the Space Weather in the AU Mic System: Stellar Winds and Extreme Coronal Mass Ejections

The Astrophysical Journal, 2022
Abstract Two close-in planets have been recently found around the M-dwarf flare star AU Microscopii (AU Mic). These Neptune-sized planets (AU Mic b and c) seem to be located very close to the so-called “evaporation valley” in the exoplanet population, making this system an important target for studying atmospheric loss on exoplanets ...
Julián D. Alvarado-Gómez, Ofer Cohen, Jeremy J. Drake, Federico Fraschetti, Katja Poppenhaeger, Cecilia Garraffo, Judy Chebly, Ekaterina Ilin, Laura Harbach, Oleg Kochukhov   +9 more
openaire   +4 more sources

Constraining the Physical Properties of Stellar Coronal Mass Ejections with Coronal Dimming: Application to Far-ultraviolet Data of ϵ Eridani

The Astrophysical Journal, 2022
Abstract Coronal mass ejections (CMEs) are a prominent contributor to solar system space weather and might have impacted the Sun’s early angular momentum evolution. A signal diagnostic of CMEs on the Sun is coronal dimming: a drop in coronal emission, tied to the mass of the CME, that is the direct result of removing emitting plasma from
R. O. Parke Loyd, James Paul Mason, Meng Jin, Evgenya L. Shkolnik, Kevin France, Allison Youngblood, Jackie Villadsen, Christian Schneider, Adam C. Schneider, Joe Llama, Tahina Ramiaramanantsoa, Tyler Richey-Yowell   +11 more
openaire   +2 more sources