Magnetic field amplification at planetary and astrophysical high Mach-number shocks - INSPIRE

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Magnetic field amplification at planetary and astrophysical high Mach-number shocks

Artem Bohdan
(
- DESY, Zeuthen
)
,
Martin Pohl
(
- DESY, Zeuthen and
- Potsdam, Max Planck Inst.
)
,
Jacek Niemiec
(
- Cracow, INP
)
,
Paul J. Morris
(
- DESY, Zeuthen
)
,
Yosuke Matsumoto
(
- Chiba U.
)

Feb 8, 2021

8 pages

Published in:

PoS ICRC2021 (2021) 443,
Phys.Rev.Lett. 126 (2021) 9, 095101

Contribution to:

- ICRC 2021
, 443

Published: 2021
and
Published: Mar 6, 2021

e-Print:

2102.04328 [astro-ph.HE]

DOI:

Report number:

DESY-20-196

View in:

ADS Abstract Service

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Abstract: (SISSA)

Collisionless shocks are present everywhere in the universe, from the solar environment to distant supernovae. They are often associated with strong magnetic fields due to strong nonthermal radiation. However, it is still not well understood how magnetic fields are amplified at scales of the shock thickness. Here we use a set of large-scale Particle-In-Cell (PIC) simulations of non-relativistic perpendicular shocks in the high Mach number regime to clarify this issue. These shocks are Weibel-instability mediated. We present the evidence that the magnetic field is amplified in the shock transition due to the Weibel instability and the magnetic field strength strongly correlates with the Alfvénic Mach number. We propose a new explanation for this correlation. PIC simulation results can explain in-situ magnetic field measurements of Saturn's bow shock performed by the Cassini spacecraft.

Note:

Accepted to PRL. 7 pages, 4 figure

Plasma and Beam Physics

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Figures(4)

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(
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)
,
Martin Pohl
(
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- Potsdam, Max Planck Inst.
)
,
Jacek Niemiec
(
- Cracow, INP
)
,
Paul J. Morris
(
- DESY, Zeuthen
)
,
Yosuke Matsumoto
(
- Chiba U.
)

et al.

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•
e-Print:
- 2102.04328
•
DOI:
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