The Parametric Instability of Alfven Waves: Effects of Temperature Anisotropy
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F17%3A00484356" target="_blank" >RIV/67985815:_____/17:00484356 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.3847/1538-4357/aa9bef" target="_blank" >http://dx.doi.org/10.3847/1538-4357/aa9bef</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/1538-4357/aa9bef" target="_blank" >10.3847/1538-4357/aa9bef</a>
Alternative languages
Result language
angličtina
Original language name
The Parametric Instability of Alfven Waves: Effects of Temperature Anisotropy
Original language description
We study the stability of large-amplitude, circularly polarized Alfven waves in an anisotropic plasma described by the double-adiabatic/CGL closure, and in particular the effect of a background thermal pressure anisotropy on the well-known properties of Alfven wave parametric decay in magnetohydrodynamics ( MHD). Anisotropy allows instability over a much wider range of values of parallel plasma beta (beta(parallel to)) when xi= p(0 perpendicular to)/p(0 parallel to) > 1. When the pressure anisotropy exceeds a critical value, xi >= xi* with xi*similar or equal to 2.7, there is a new regime in which the parametric instability is no longer quenched at high beta(parallel to), and in the limit beta(parallel to) >> 1, the growth rate becomes independent of beta(parallel to). In the opposite case of xi < xi*, the instability is strongly suppressed with increasing parallel plasma beta, similarly to the MHD case. We analyze marginal stability conditions for parametric decay in the (xi, beta(parallel to)) parameter space and discuss possible implications for Alfvenic turbulence in the solar wind.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/GA15-10057S" target="_blank" >GA15-10057S: Solar wind ions: correlations, constraints, and causality</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astrophysical Journal
ISSN
0004-637X
e-ISSN
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Volume of the periodical
851
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
9
Pages from-to
"99/1"-"99/9"
UT code for WoS article
000418350300002
EID of the result in the Scopus database
2-s2.0-85039749425