Results 81 to 90 of about 240,141 (195)

Comparative Analysis of Ion and Electron Contributions to Ionospheric Ionization at Auroral and Subauroral Latitudes

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Electron and proton precipitation into the nightside ionosphere is a key process in magnetosphere–ionosphere coupling. Although auroral electron precipitation at ∼0.1 ${\sim} 0.1$–10 keV is traditionally considered the main driver of auroral emissions, recent studies show that >30 ${ >} 30$ keV electrons and protons can significantly ...
S. R. Kamaletdinov, A. V. Artemyev, Y. Shen, X.‐J. Zhang, Y. Nishimura, J. Liang, V. Angelopoulos, Y. Miyoshi, K. Keika, K. Asamura, A. Bhatt, S. Kasahara, Y. Kasahara, S. Matsuda, T. Hori, A. Matsuoka, M. Teramoto, K. Yamamoto, S. Yokota, A. Shinbori, F. Tsuchiya, A. Kumamoto, I. Shinohara   +22 more
wiley   +1 more source

A Cooler Look at the Environment of Cygnus X-1: Searching for Dynamical Interactions within Cold Molecular Gas

The Astrophysical Journal
We present IRAM 30 m observations aimed at identifying potential outflow–interstellar medium interaction sites in the vicinity of the black hole X-ray binary Cygnus X-1, which displays persistent relativistic jets and a prominent stellar wind. Using this
Pau Bosch-Cabot, Alexandra J. Tetarenko, Valentí Bosch-Ramon, James C. A. Miller-Jones, David Russell, Sara E. Motta, Pikky Atri, María Díaz-Trigo, Isabella Mariani, Steve Prabu   +9 more
doaj   +1 more source

Microscopic Processes in Global Relativistic Jets Containing Helical Magnetic Fields: Dependence on Jet Radius

Galaxies, 2017
In this study, we investigate the interaction of jets with their environment at a microscopic level, which is a key open question in the study of relativistic jets.
Ken-Ichi Nishikawa, Yosuke Mizuno, Jose L. Gómez, Ioana Duţan, Athina Meli, Charley White, Jacek Niemiec, Oleh Kobzar, Martin Pohl, Asaf Pe’er, Jacob Trier Frederiksen, Åke Nordlund, Helene Sol, Philip E. Hardee, Dieter H. Hartmann   +14 more
doaj   +1 more source

Reanalysis of SKR Source Crossed by Cassini: Loss Cone Electrons as a Secondary Source of Free Energy

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Saturn's Kilometric Radiation (SKR) is a powerful non‐thermal radio auroral emission produced by the Cyclotron Maser Instability (CMI), which generates waves close to the local cyclotron frequency in a highly magnetized plasma from mildly relativistic electrons.
B. Collet, L. Lamy, Y. Kasaba, N. Andre
wiley   +1 more source

Interfaces in Numerical Relativistic hydrodynamics

, 2010
This thesis investigates numerical techniques for modelling sharp interfacesbetween relativistic fluids. The motivation for this work lies in obtaining accuratemodels of neutron star interiors for use in multidimensional simulationsin general relativity.
Millmore, Stephen Timothy
core   +1 more source

Characterization of the Western Pictor A Hotspot in Hard X-Rays with NuSTAR

The Astrophysical Journal
The origin of X-ray emission from the resolved kiloparsec-scale jets and hotspots of many active galactic nuclei remains uncertain, particularly where the X-ray emission is separate from the radio-optical synchrotron component.
Aamil Shaik, Eileen T. Meyer, Karthik Reddy, Sibasish Laha, Markos Georganopoulos   +4 more
doaj   +1 more source

Spiky Bursts of Energetic Electron Beams Upstream of Nonstationary Quasi‐Perpendicular Shocks

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Energetic electron beams play a crucial role in collisionless shocks by driving upstream plasma waves and providing seed populations for diffusive shock acceleration. However, the processes responsible for their generation at quasi‐perpendicular shocks remain poorly understood.
Ao Guo, Quanming Lu, San Lu, Shutao Yao, Xinliang Gao   +4 more
wiley   +1 more source

Radiation from accelerated particles in relativistic jets with shocks, shear-flow, and reconnection

EPJ Web of Conferences, 2013
We have investigated particle acceleration and shock structure associated with an unmagnetized relativistic jet propagating into an unmagnetized plasma for electron-positron and electron-ion plasmas.
Nishikawa K.-I., Hardee P., Mizuno Y., Duţan I., Zhang B., Medvedev M, Choi E.J., Min K. W., Niemiec J., Nordlund Å., Frederiksen J., Sol H., Pohl M., Hartmann D. H., Marscher A., Gómez J. L.   +15 more
doaj   +1 more source

Statistical Study of Betatron and Fermi Electron Acceleration at Dipolarization Fronts

Geophysical Research Letters, Volume 53, Issue 15, 16 August 2026.
Abstract Magnetic reconnection jets in Earth's magnetotail are regions of electron heating and acceleration. They are often associated with dipolarization fronts (DFs), which are characterized by sharp increases in the northward magnetic field component Bz ${B}_{z}$.
A. Kolokotronis, D. B. Graham, Yu. V. Khotyaintsev, C. Norgren, K. Steinvall, L. Richard   +5 more
wiley   +1 more source

Quasiperiodic Polarized Emissions from Kink Structure in Magnetized Relativistic Jets

The Astrophysical Journal
Recent polarimetric observations of blazars indicate the development of current-driven (CD) kink instability after passing the recollimation shocks in the relativistic jets and association with quasiperiodic oscillations (QPOs).
Xu-Fan Hu, Hong-Xuan Jiang, Yosuke Mizuno, Christian M. Fromm, Bhargav Vaidya   +4 more
doaj   +1 more source