4 papers
Impact of Cosmic Ray Distribution on the Growth and Saturation of Bell Instability
Saikat Das, Siddhartha Gupta, Prateek Sharma
Cosmic rays (CRs) streaming in weakly magnetized plasmas can drive large-amplitude magnetic fluctuations via nonresonant streaming instability (NRSI), or Bell instability. Using on…
Speed-dependent Threshold for Electron Injection into Diffusive Shock Acceleration
Siddhartha Gupta, Damiano Caprioli, Anatoly Spitkovsky
Finding the injection threshold for diffusive shock acceleration (DSA) of electrons in collisionless shocks has been a longstanding unsolved problem. Using first-principles kinetic…
Understanding Streaming Instabilities in the Limit of High Cosmic Ray Current Density
Emily Lichko, Damiano Caprioli, Benedikt Schroer +1
A critical component of particle acceleration in astrophysical shocks is the non-resonant (Bell) instability, where the streaming of cosmic rays (CRs) leads to the amplification of…
Nonthermal Signatures of Radiative Supernova Remnants II: The Impact of Cosmic Rays and Magnetic Fields
Rebecca Diesing, Siddhartha Gupta
Near the ends of their lives, supernova remnants (SNRs) enter a "radiative phase," when efficient cooling of the postshock gas slows expansion. Understanding SNR evolution at this…