Frontiers in Astronomy and Space Sciences | |
Temperature Anisotropy Instabilities Stimulated by the Solar Wind Suprathermal Populations | |
Astronomy and Space Sciences | |
Marian Lazar1  Stefaan Poedts2  R.A. López3  Horst Fichtner4  Peter Haesung Yoon5  Shaaban Mohammed Shaaban6  | |
[1] Centre for Mathematical Plasma-Astrophysics, KU Leuven, Leuven, Belgium;Institut für Theoretische Physik IV, Ruhr-Universität Bochum, Bochum, Germany;Centre for Mathematical Plasma-Astrophysics, KU Leuven, Leuven, Belgium;Institute of Physics, University of Maria Curie-Skłodowska, Lublin, Poland;Departamento de Física, Universidad de Santiago de Chile, Santiago, Chile;Institut für Theoretische Physik IV, Ruhr-Universität Bochum, Bochum, Germany;Institute for Physical Science and Technology, University of Maryland, College Park, MD, United States;Theoretical Physics Research Group, Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt; | |
关键词: instabilities; solar wind; temperature; suprathermal particles; particle velocity distribution; | |
DOI : 10.3389/fspas.2021.777559 | |
received in 2021-09-15, accepted in 2021-12-14, 发布年份 2022 | |
来源: Frontiers | |
【 摘 要 】
This review paper compiles recent results obtained by the present group of authors describing the effects of suprathermal populations present in space plasmas (up to a few keVs) on temperature anisotropy instabilities. Of particular interest are the electromagnetic cyclotron and firehose excitations, which play a major role in limiting temperature anisotropy, resulting, for instance, from the adiabatic expansion of the solar wind. Relying on a rigorous modeling and interpretation of the observed velocity distributions, both theoretical models and numerical simulations indicate a systematic stimulation of these excitations in the presence of suprathermal populations of electrons or protons. Moreover, the enhanced fluctuations react back on particles, and determine a faster and deeper relaxation of their anisotropy. The present comparative analysis suggests that previous studies, considering only quasi-thermal low-energy populations, may have significantly underestimated these excitations and their implications in various applications in space plasmas.
【 授权许可】
Unknown
Copyright © 2022 Lazar, López, Shaaban, Poedts, Yoon and Fichtner.
【 预 览 】
Files | Size | Format | View |
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RO202310100078902ZK.pdf | 3008KB | download |