50 citations · 410 across the 26 of their papers we have counts for
27 papers
PIC simulations of nonrelativistic high-Mach-number oblique shocks propagating in a turbulent medium
Karol Fulat, Eloise Moore, Mahmoud Alawashra +4
Collisionless shocks are common in astrophysical systems and stand as sites of particle acceleration. While particles at perpendicular shocks may not return to the upstream region,…
Radiative signatures of electron-ion shocks in BL Lac type objects
A. Arbet-Engels, A. Bohdan, F. Rieger +2
Shocks are promising sites of particle acceleration in extragalactic jets. In electron-ion shocks, electrons can be heated up to large Lorentz factors, making them an attractive sc…
Hillas meets Eddington: The case for blazars as ultra-high-energy neutrino sources
Xavier Rodrigues, Frank Rieger, Artem Bohdan +1
Blazars are promising high-energy neutrino source candidates. However, leptohadronic models face challenges in describing neutrino emission within a viable energy budget, and their…
Neural Networks for the Analysis of Traced Particles in Kinetic Plasma Simulations
Gabriel Torralba Paz, Artem Bohdan, Jacek Niemiec
Cosmic-ray acceleration processes in astrophysical plasmas are often investigated with fully-kinetic or hybrid kinetic numerical simulations, which enable us to describe a detailed…
Electrostatic Waves and Electron Holes in Simulations of Low-Mach Quasi-Perpendicular Shocks
Artem Bohdan, Aaron Tran, Lorenzo Sironi +1
Collisionless low Mach number shocks are abundant in astrophysical and space plasma environments, exhibiting complex wave activity and wave-particle interactions. In this paper, we…
Diffusive shock acceleration in relativistic, oblique shocks
Allard Jan van Marle, Artem Bohdan, Anabella Araudo +2
Cosmic rays are charged particles that are accelerated to relativistic speeds by astrophysical shocks. Numerical models have been successful in confirming the acceleration process…
Kinetic simulations of non-relativistic high-Mach-number perpendicular shocks propagating in a turbulent medium
Karol Fulat, Artem Bohdan, Gabriel Torralba Paz +1
Strong non-relativistic shocks are known to accelerate particles up to relativistic energies. However, for Diffusive Shock Acceleration electrons must have a highly suprathermal en…
Prediction and Anomaly Detection of accelerated particles in PIC simulations using neural networks
Gabriel Torralba Paz, Artem Bohdan, Jacek Niemiec
Acceleration processes that occur in astrophysical plasmas produce cosmic rays that are observed on Earth. To study particle acceleration, fully-kinetic particle-in-cell (PIC) simu…
Using PIC and PIC-MHD to investigate cosmic ray acceleration in mildly relativistic shocks
Artem Bohdan, Anabella Araudo, Allard Jan van Marle +2
Astrophysical shocks create cosmic rays by accelerating charged particles to relativistic speeds. However, the relative contribution of various types of shocks to the cosmic ray sp…
Electron-Ion Temperature Ratio in Astrophysical Shocks
John C. Raymond, Parviz Ghavamian, Artem Bohdan +9
Collisionless shock waves in supernova remnants and the solar wind heat electrons less effectively than they heat ions, as is predicted by kinetic simulations. However, the values…
Pre-acceleration in the Electron Foreshock II: Oblique Whistler Waves
Paul J. Morris, Artem Bohdan, Martin S. Weidl +3
Thermal electrons have gyroradii many orders of magnitude smaller than the finite width of a shock, thus need to be pre-accelerated before they can cross it and be accelerated by d…
Electron acceleration at supernova remnants
Artem Bohdan
Supernova remnants (SNRs) are believed to produce the majority of galactic cosmic rays (CRs). SNRs harbor non-relativistic collisionless shocks responsible for acceleration of CRs…
Nonthermal Electron Acceleration at Collisionless Quasi-perpendicular Shocks
T. Amano, Y. Matsumoto, A. Bohdan +6
Shock waves propagating in collisionless heliospheric and astrophysical plasmas have been studied extensively over the decades. One prime motivation is to understand the nonthermal…
Pre-acceleration in the Electron Foreshock I: Electron Acoustic Waves
Paul J. Morris, Artem Bohdan, Martin S. Weidl +1
To undergo diffusive shock acceleration, electrons need to be pre-accelerated to increase their energies by several orders of magnitude, else their gyro-radii are smaller than the…
The electron foreshock at high-Mach-number nonrelativistic oblique shocks
Artem Bohdan, Martin S. Weidl, Paul J. Morris +1
In the Universe matter outside of stars and compact objects is mostly composed of collisionless plasma. The interaction of a supersonic plasma flow with an obstacle results in coll…
Diffusive shock acceleration at oblique high Mach number shocks
Allard Jan van Marle, Artem Bohdan, Paul J. Morris +2
The current paradigm of cosmic ray (CR) origin states that the most part of galactic CRs is produced by supernova remnants. The interaction of supernova ejecta with the interstella…
Magnetic field amplification by the Weibel instability at planetary and astrophysical high-Mach-number shocks
Artem Bohdan, Martin Pohl, Jacek Niemiec +5
Collisionless shocks are ubiquitous in the Universe and often associated with strong magnetic field. Here we use large-scale particle-in-cell simulations of non-relativistic perpen…
Mildly relativistic magnetized shocks in electron-ion plasmas -- II. Particle acceleration and heating
Arianna Ligorini, Jacek Niemiec, Oleh Kobzar +7
Particle acceleration and heating at mildly relativistic magnetized shocks in electron-ion plasma are investigated with unprecedentedly high-resolution two-dimensional particle-in-…
Mildly relativistic magnetized shocks in electron-ion plasmas I. Electromagnetic shock structure
Arianna Ligorini, Jacek Niemiec, Oleh Kobzar +8
Mildly relativistic shocks in magnetized electron-ion plasmas are investigated with 2D kinetic particle-in-cell simulations of unprecedentedly high resolution and large scale for c…
Kinetic simulation of nonrelativistic perpendicular shocks of young supernova remnants. IV. Electron heating
Artem Bohdan, Martin Pohl, Jacek Niemiec +4
High Mach number collisionless shocks are found in planetary systems and supernova remnants (SNRs). Electrons are heated at these shocks to the temperature well above the Rankine-H…
Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. III. Magnetic reconnection
Artem Bohdan, Martin Pohl, Jacek Niemiec +4
Fully kinetic two-dimensional particle-in-cell simulations are used to study electron acceleration at high-Mach-number nonrelativistic perpendicular shocks. SNR shocks are mediated…
Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. II. Influence of shock-surfing acceleration on downstream electron spectra
Artem Bohdan, Jacek Niemiec, Martin Pohl +3
We explore electron pre-acceleration at high Mach-number nonrelativistic perpendicular shocks at, e.g., young supernova remnants, which are a prerequisite of further acceleration t…
Kinetic simulations of nonrelativistic perpendicular shocks of young supernova remnants. I. Electron shock-surfing acceleration
Artem Bohdan, Jacek Niemiec, Martin Pohl +3
Electron injection at high Mach-number nonrelativistic perpendicular shocks is studied here for parameters that are applicable to young SNR shocks. Using high-resolution large-scal…
Revisit of non-linear Landau damping for electrostatic instability driven by blazar-induced pair beams
S. Vafin, P. J. Deka, M. Pohl +1
We revisit the effect of non-linear Landau (NL) damping on the electrostatic instability of blazar-induced pair beams, using a realistic pair-beam distribution. We employ a simplif…