Note on one-fluid modeling of low-frequency Alfvénic fluctuations in a solar wind plasma with multi-ion components

Journal Article · Tue Dec 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4936798· OSTI ID:22489986

Nariyuki, Y. ^[1]; Umeda, T. ^[2]; Suzuki, T. K. ^[3]; Hada, T. ^[4]

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1. Faculty of Human Development, University of Toyama, 3190, Toyama City, Toyama 930-8555 (Japan)
2. Solar-Terrestrial Environment Laboratory, Nagoya University, Nagoya, Aichi 464-8601 (Japan)
3. Department of Physics, Nagoya University, Furo-cho, Nagoya, Aichi 464-8602 (Japan)
4. Department of Earth System Science and Technology, Kyushu University, 6-1, Kasuga City, Fukuoka 816-8580 (Japan)

A simple point of view that non-zero Alfvén ratio (residual energy) appears as a consequence of one-fluid modeling of uni-directional Alfvén waves in a solar wind plasma is presented. Since relative speeds among ions are incorporated into the one-fluid model as a pressure anisotropy, the Alfvén ratio can be finite due to the decrease in the phase velocity. It is shown that a proton beam component typically found in the solar wind plasma can contribute to generating non-zero Alfvén ratio observed in the solar wind plasma. Local equilibrium velocity distribution functions of each ion component are also discussed by using maximum entropy principle.

• OSTI ID: 22489986
• Journal Information: Physics of Plasmas, Vol. 22, Issue 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ANISOTROPY
DISTRIBUTION FUNCTIONS
ENTROPY
IONS
PHASE VELOCITY
PLASMA
PROTON BEAMS
SIMULATION
SOLAR WIND