272 citations · 1k across the 21 of their papers we have counts for
21 papers
Particle Acceleration in Stratified 2D MRI Turbulence: From Reconnection to First- and Second-Order Fermi and Shear Acceleration
Astor Sandoval, Mario Riquelme, Jorge Cuadra
Low-luminosity accretion disks around black holes are weakly collisional, potentially enabling nonthermal particle acceleration. Local two-dimensional particle-in-cell simulations…
Transport of electrons in tangled magnetic fields
Daniel Verscharen, Natasha Jeffrey, Anton Artemyev +6
Cosmic magnetic fields are typically inhomogeneous and often highly tangled due to large-scale plasma flows, turbulence, and instabilities. If the variations in the magnetic field…
Double Power-law Electron Spectra in Solar Flares Due to Temperature Anisotropy Instabilities
Martín Astete, Mario Riquelme, Daniel Verscharen
Despite extensive observational and theoretical efforts, the physical processes responsible for shaping the diversity of accelerated electron spectra observed in solar flares remai…
Secondary Whistler and Ion-cyclotron Instabilities driven by Mirror Modes in Galaxy Clusters
Francisco Ley, Ellen G. Zweibel, Drake Miller +1
Electron cyclotron waves (whistlers), are commonly observed in plasmas near Earth and the solar wind. In the presence of nonlinear mirror modes, bursts of whistlers, usually called…
Particle-in-cell Simulations of the Magnetorotational Instability in Stratified Shearing Boxes
Astor Sandoval, Mario Riquelme, Anatoly Spitkovsky +1
The magnetorotational instability (MRI) plays a crucial role in regulating the accretion efficiency in astrophysical accretion disks. In low-luminosity disks around black holes, su…
Electron Re-acceleration via Ion Cyclotron Waves in the Intracluster Medium
Aaron Tran, Lorenzo Sironi, Francisco Ley +2
In galaxy clusters, the intracluster medium (ICM) is expected to host a diffuse, long-lived, and invisible population of "fossil" cosmic-ray electrons (CRe) with 1-100 MeV energies…
A Heating Mechanism via Magnetic Pumping in the Intracluster Medium
Francisco Ley, Ellen G. Zweibel, Mario Riquelme +3
Turbulence driven by AGN activity, cluster mergers and galaxy motion constitutes an attractive energy source for heating the intracluster medium (ICM). How this energy dissipates i…
Stochastic Electron Acceleration by Temperature Anisotropy Instabilities Under Solar Flare Plasma Conditions
Mario Riquelme, Alvaro Osorio, Daniel Verscharen +1
Using 2D particle-in-cell (PIC) plasma simulations we study electron acceleration by temperature anisotropy instabilities, assuming conditions typical of above-the-loop-top (ALT) s…
Stochastic Ion Acceleration by the Ion-cyclotron Instability in a Growing Magnetic Field
Francisco Ley, Mario Riquelme, Lorenzo Sironi +2
Using 1D and 2D particle-in-cell (PIC) simulations of a plasma with a growing magnetic field , we show that ions can be stochastically accelerated by the ion-cyclotron (IC…
Stochastic Electron Acceleration by the Whistler Instability in a Growing Magnetic Field
Mario Riquelme, Alvaro Osorio, Eliot Quataert
We use 2D particle-in-cell (PIC) simulations to study the effect of the saturated whistler instability on the viscous heating and nonthermal acceleration of electrons in a shearing…
PIC Simulations of Velocity-Space Instabilities in a Decreasing Magnetic Field: Viscosity and Thermal Conduction
Mario Riquelme, Eliot Quataert, Daniel Verscharen
We use particle-in-cell (PIC) simulations of a collisionless, electron-ion plasma with a decreasing background magnetic field, , to study the effect of velocity-space instabilit…
The microphysics of collisionless shock waves
A. Marcowith, A. Bret, A. Bykov +12
Collisionless shocks, that is shocks mediated by electromagnetic processes, are customary in space physics and in astrophysics. They are to be found in a great variety of objects a…
PIC Simulations of the Effect of Velocity Space Instabilities on Electron Viscosity and Thermal Conduction
Mario Riquelme, Eliot Quataert, Daniel Verscharen
In low-collisionality plasmas, velocity-space instabilities are a key mechanism providing an effective collisionality for the plasma. We use particle-in-cell (PIC) simulations to s…
PIC Simulations of Continuously Driven Mirror and Ion Cyclotron Instabilities in High Beta Astrophysical and Heliospheric Plasmas
Mario Riquelme, Eliot Quataert, Daniel Verscharen
We use particle-in-cell (PIC) simulations to study the nonlinear evolution of ion velocity space instabilities in an idealized problem in which a background velocity shear continuo…
Local 2D Particle-in-cell simulations of the collisionless MRI
Mario A. Riquelme, Eliot Quataert, Prateek Sharma +1
The magnetorotational instability (MRI) is a crucial mechanism of angular momentum transport in a variety of astrophysical accretion disks. In systems accreting at well below the E…
Electron Injection by Whistler Waves in Non-relativistic Shocks
Mario A. Riquelme, Anatoly Spitkovsky
Electron acceleration to non-thermal, ultra-relativistic energies (~ 10-100 TeV) is revealed by radio and X-ray observations of shocks in young supernova remnants (SNRs). The diffu…
Magnetic Amplification by Magnetized Cosmic Rays in SNR Shocks
Mario A. Riquelme, Anatoly Spitkovsky
(Abridged) X-ray observations of synchrotron rims in supernova remnant (SNR) shocks show evidence of strong magnetic field amplification (a factor of ~100 between the upstream and…
Non-linear Study of Bell's Cosmic Ray Current-driven Instability
Mario A. Riquelme, Anatoly Spitkovsky
The cosmic ray current-driven (CRCD) instability, predicted by Bell (2004), consists of non-resonant, growing plasma waves driven by the electric current of cosmic rays (CRs) that…
Lower Metal Enrichment of Virialized Gas in Minihalos
Renyue Cen, Mario A. Riquelme
We differentiate between the metal enrichment of the gas in virialized minihalos and that of the intergalactic medium at high redshift, pertinent to cosmological reionization, with…
Separating the Weak Lensing and Kinetic SZ Effects from CMB Temperature Maps
Mario A. Riquelme, David N. Spergel
A new generation of CMB experiments will soon make sensitive high resolution maps of the microwave sky. At angular scales less than 10 arcminutes, most CMB anisotropies are g…
Neutrino emission rates in highly magnetized neutron stars revisited
Mario Riquelme, Andreas Reisenegger, Olivier Espinosa +1
Magnetars are a subclass of neutron stars whose intense soft-gamma-ray bursts and quiescent X-ray emission are believed to be powered by the decay of a strong internal magnetic fie…