902 citations · 3.2k across the 78 of their papers we have counts for
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Self-discharge by streaming cosmic rays
Yutaka Ohira
A new nonthermal phenomenon caused by streaming cosmic rays (CRs) in the universe is proposed. The streaming CRs drive the return current of thermal electrons to compensate for the…
Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
Hiromasa Suzuki, Aya Bamba, Ryo Yamazaki +1
Supernova remnants (SNRs) are thought to be the most promising sources of Galactic cosmic rays. One of the principal questions is whether they are accelerating particles up to the…
Identification of electrostatic two-stream instabilities associated with a laser-driven collisionless shock in a multicomponent plasma
Youichi Sakawa, Yutaka Ohira, Rajesh Kumar +3
Electrostatic two-stream instabilities play essential roles in an electrostatic collisionless shock formation. They are a key dissipation mechanism and result in ion heating and ac…
Escape of cosmic rays from perpendicular shocks in the interstellar magnetic field
Shoma F. Kamijima, Yutaka Ohira
We investigate the escape process from a perpendicular shock region of a spherical shock in the interstellar medium (ISM). The diffusive shock acceleration in the perpendicular sho…
Magnetic field generation by charge exchange in a supernova remnant in the early universe
Shuhei Kashiwamura, Yutaka Ohira
We present new generation mechanisms of magnetic fields in supernova remnant shocks propagating to partially ionized plasmas in the early universe. Upstream plasmas are dissipated…
The Biermann battery driven by a streaming plasma
Yutaka Ohira
The Biermann battery is a promising generation mechanism of a seed magnetic field in the universe. We propose a new driving mechanism for the Biermann battery in an inhomogeneous p…
Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A
Yuri Sato, Kaori Obayashi, Ryo Yamazaki +2
Recently, ground-based Imaging Atmospheric Cherenkov Telescopes have reported the detection of very-high-energy (VHE) gamma-rays from some gamma-ray bursts (GRBs). One of them, GRB…