Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Benáček, Jan"'
Autor:
Benáček, Jan, Timokhin, Andrey, Muñoz, Patricio A., Jessner, Axel, Rievajová, Tatiana, Pohl, Martin, Büchner, Jörg
Publikováno v:
A&A 691, A137 (2024)
Pair cascades in polar cap regions of neutron stars are considered to be an essential process in various models of coherent radio emissions of pulsars. The cascades produce pair plasma bunch discharges in quasi-periodic spark events. The cascade prop
Externí odkaz:
http://arxiv.org/abs/2405.20866
Publikováno v:
Astronomy & Astrophysics 683, A69, 2024
Coherent radiation of pulsars, magnetars, and fast radio bursts could, in theory, be interpreted as radiation from solitons and soliton-like waves. The solitons are meant to contain a large number of electric charges confined on long time-scales and
Externí odkaz:
http://arxiv.org/abs/2309.15613
Autor:
Benáček, Jan, Karlický, Marian
Publikováno v:
Ben\'a\v{c}ek, J., Karlick\'y, M. Zebra Stripes with High Gyro-Harmonic Numbers. Solar Physics, 297, 103 (2022)
Solar radio zebras are used in the determination of the plasma density and magnetic field in solar flare plasmas. Analyzing observed zebra stripes and assuming their generation by the double-plasma resonance (DPR) instability, high values of the gyro
Externí odkaz:
http://arxiv.org/abs/2208.10131
Publikováno v:
A&A 675, A42 (2023)
Linear acceleration emission is one of the mechanisms that might explain intense coherent emissions of radio pulsars. This mechanism is not well understood, however, because the effects of collective plasma response and nonlinear plasma evolution on
Externí odkaz:
http://arxiv.org/abs/2111.05262
Magnetic reconnection in solar flares can efficiently generate non-thermal electron beams. The energetic electrons can, in turn, cause radio waves through microscopic plasma instabilities as they propagate through the ambient plasma along the magneti
Externí odkaz:
http://arxiv.org/abs/2107.13746
Electromagnetic waves due to electron-positron clouds (bunches), created by cascading processes in pulsar magnetospheres, have been proposed to explain the pulsar radio emission. In order to verify this hypothesis, we utilized for the first time Part
Externí odkaz:
http://arxiv.org/abs/2106.13525
Publikováno v:
The Astrophysical Journal, Volume 910, Number 2, 2021
Narrowband spikes are observed in solar flares for several decades. However, their exact origin is still discussed. To contribute to understanding of these spikes, we analyze the narrowband spikes observed in the 800-2000 MHz range during the impulsi
Externí odkaz:
http://arxiv.org/abs/2104.01345
Publikováno v:
ApJ, 915, 127 (2021)
A number of possible pulsar radio emission mechanisms are based on streaming instabilities in relativistically hot electron-positron pair plasmas. At saturation the unstable waves can form, in principle, stable solitary waves which could emit the obs
Externí odkaz:
http://arxiv.org/abs/2101.03083
Publikováno v:
A&A 649, A145 (2021)
Several important mechanisms that explain the coherent pulsar radio emission rely on streaming (or beam) instabilities of the relativistic pair plasma in a pulsar magnetosphere. However, it is still not clear whether a streaming instability by itself
Externí odkaz:
http://arxiv.org/abs/2011.07377
Autor:
Benáček, Jan, Karlický, Marian
Publikováno v:
The Astrophysical Journal, Volume 896, Number 1, 2020
The X-ray emission of coronal flare sources can be explained considering the kappa electron distribution. Motivated by this fact, we study the problem of how hot plasma with the kappa distribution of electrons is confined in these sources. For compar
Externí odkaz:
http://arxiv.org/abs/2006.04479