July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Magnetic field amplification by high Alfven Mach number shocks in partially ionized plasmas

Aug 4, 2015, 4:00 PM
Amazon Foyer (World Forum)

Amazon Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 201
Poster contribution CR-TH Poster 3 CR


Yutaka Ohira (Aoyama Gakuin University)


The interstellar medium and ejecta of supernova are not always completely ionized. Such partially ionized plasmas are though to be unsuitable for cosmic ray acceleration. In order to study shock structures of collisionless shocks in partially ionized plasmas, we perform two-dimensional hybrid simulations. We find that large density fluctuations and large magnetic fields fluctuations are generated both in the upstream and downstream regions for high Alfven Mach number shocks. For the shock velocity Vs = 1333 km/s = 57 Va, the strong turbulence is generated in the downstream region by the upstream density fluctuations and the downstream magnetic field is amplified over 30 times the initial upstream magnetic fields. In addition, we find that the velocity distribution of downstream hydrogen atoms has three components for Vs = 1333 km/s. Observed shock structures suggest that diffusive shock acceleration can operate at perpendicular shocks propagating into partially ionized plasmas in real three-dimensional systems. If possible, we will present results of three-dimensional simulations.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 708

Primary author

Yutaka Ohira (Aoyama Gakuin University)

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