Results 11 to 20 of about 78,498 (257)

Synchrotron Firehose Instability

The Astrophysical Journal, 2023
We demonstrate using linear theory and particle-in-cell (PIC) simulations that a synchrotron-cooling collisionless plasma acquires pressure anisotropy and, if the plasma beta is sufficiently high, becomes unstable to the firehose instability, in a ...
Vladimir Zhdankin, Matthew W. Kunz, Dmitri A. Uzdensky   +2 more
doaj   +1 more source

High-Frequency Dynamics of Active Region Moss as Observed by IRIS

Frontiers in Astronomy and Space Sciences, 2019
The high temporal, spatial and spectral resolution of Interface Region Imaging Spectrograph (IRIS) has provided new insights into the understanding of different small-scale processes occurring at the chromospheric and transition region (TR) heights.
Nancy Narang, Vaibhav Pant, Dipankar Banerjee, Tom Van Doorsselaere   +3 more
doaj   +1 more source

Exact Calculation of Nonideal Fields Demonstrates Their Dominance of Injection in Relativistic Reconnection

The Astrophysical Journal Letters, 2023
Magnetic reconnection is an important source of energetic particles in systems ranging from astrophysics to the laboratory. The large separation of spatiotemporal scales involved makes it critical to determine the minimum physical model containing the ...
Samuel R. Totorica, Seiji Zenitani, Shuichi Matsukiyo, Mami Machida, Kazuhiro Sekiguchi, Amitava Bhattacharjee   +5 more
doaj   +1 more source

Optimized gyrosynchrotron algorithms and fast codes [PDF]

, 2010
Gyrosynchrotron (GS) emission of charged particles spiraling in magnetic fields plays an exceptionally important role in astrophysics. In particular, this mechanism makes a dominant contribution to the continuum solar and stellar radio emissions. However,
Alexey A. Kuznetsov, Eidman, Eidman, Gregory D. Fleishman, Klein, Melrose   +5 more
core   +1 more source

Dense astrophysical plasmas [PDF]

Journal of Physics: Condensed Matter, 2002
We briefly examine the properties of dense plasmas characteristic of the atmospheres of neutron stars and of the interior of massive white dwarfs. These astrophysical bodies are natural laboratories to study respectively the problem of pressure ionization of hydrogen in a strong magnetic field and the crystallization of the quantum one-component-plasma
Chabrier, G., Douchin, F., Potekhin, A. Y.   +2 more
openaire   +2 more sources

Amplitudes and Energy Fluxes of Simulated Decayless Kink Oscillations

Frontiers in Astronomy and Space Sciences, 2019
Recent observations with the Atmospheric Imaging Assembly (AIA) instrument on the SDO spacecraft have revealed the existence of decayless coronal kink oscillations.
Konstantinos Karampelas, Tom Van Doorsselaere, David J. Pascoe, Mingzhe Guo, Mingzhe Guo, Patrick Antolin   +5 more
doaj   +1 more source

Multithermal Jet Formation Triggered by Flux Emergence

The Astrophysical Journal Letters, 2023
Flux emergence is responsible for various solar eruptions. Combining observation and simulations, we investigate the influence of flux emergence at one footpoint of an arcade on coronal rain as well as induced eruptions.
Xiaohong Li, Rony Keppens, Yuhao Zhou
doaj   +1 more source

Comment on "Head-on collision of electron acoustic solitary waves in a plasma with nonextensive hot electrons" [PDF]

, 2012
In a recent paper "Head-on collision of electron acoustic solitary waves in a plasma with nonextensive hot electrons" [Astrophys. Space Sci. 338, 271-278 (2012)] Eslami, Mottaghizadeh and Pakzad deal with the problem of the head-on collisions between two
Frank Verheest, H. Demiray, P. Eslami, P. Eslami   +3 more
core   +3 more sources

Modelling the total solar eclipse in 2024 with COCONUT

Astronomy & Astrophysics
Context. Coronal modelling is crucial for a better understanding of solar physics and heliophysics. Accurate plasma conditions at the outer boundary of a solar corona lead to more precise space weather predictions.
Baratashvili T., Wang H. P., Sorokina D., Lani A., Poedts S.   +4 more
doaj   +1 more source

The Wisconsin Plasma Astrophysics Laboratory

, 2015
The Wisconsin Plasma Astrophysics Laboratory (WiPAL) is a flexible user facility designed to study a range of astrophysically relevant plasma processes as well as novel geometries that mimic astrophysical systems. A multi-cusp magnetic bucket constructed
Brookhart, M., Clark, M., Cooper, C. M., Desangles, V., Egedal, J., Endrizzi, D., Flanagan, K., Forest, C. B., Khalzov, I. V., Li, H., Miesch, M., Milhone, J., Nornberg, M., Olson, J., Peterson, E., Roesler, F., Schekochihin, A., Schmitz, O., Siller, R., Spitkovsky, A., Stemo, A., Wallace, J., Weisberg, D., Zweibel, E.   +23 more
core   +1 more source