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A stringent limit on the amplitude of alfvénic perturbations in high-beta low-collisionality plasmas

Abstract:

It is shown that low-collisionality plasmas cannot support linearly polarized shear-Alfvén fluctuations above a critical amplitude δB⊥/B0 ∼ B-1/2, where β is the ratio of thermal to magnetic pressure. Above this cutoff, a developing fluctuation will generate a pressure anisotropy that is sufficient to destabilize itself through the parallel firehose instability. This causes the wave frequency to approach zero, interrupting the fluctuation before any oscillation. The magnetic field lines rapid...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Publisher's version

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Publisher copy:
10.3847/2041-8205/830/2/L25

Authors


Quataert, E More by this author
More by this author
Institution:
University of Oxford
Department:
Merton College
Publisher:
IOP Publishing Publisher's website
Journal:
Astrophysical Journal Letters Journal website
Volume:
830
Issue:
2
Pages:
L25
Publication date:
2016-10-12
Acceptance date:
2016-09-16
DOI:
EISSN:
2041-8213
ISSN:
2041-8205
Pubs id:
pubs:657929
URN:
uri:a2251b70-9065-4f27-bebc-552d7d268f04
UUID:
uuid:a2251b70-9065-4f27-bebc-552d7d268f04
Local pid:
pubs:657929

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