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Dear Colleagues,

Astrophysical space plasmas exhibit extremely complex dynamics that are characterized by turbulence and nonlinear processes. This is especially true for plasma in the solar, heliospheric, magnetospheric, and ionospheric regions. The complexity of the dynamics of such plasma systems can be revealed by using unconventional methods based on information theory methods and dynamical systems, as has become clear over the past two decades.

The purpose of this Special Issue is to collect studies on solar, heliospheric, and space plasma dynamics using methods developed within the framework of information theory and dynamical systems. Studies using the previously described techniques and approaches on phenomena in solar, heliospheric, magnetospheric, and ionospheric plasmas, as well as more broadly on space physics, such as Sun–Earth interaction processes, are welcome. In particular, works dealing with the investigation of heliospheric and magnetospheric plasma turbulence from MHD to kinetic scales using information entropy measure approaches are highly encouraged.

Prof. Dr. Giuseppe Consolini
Dr. Paola De Michelis
Guest Editors

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Keywords

space plasma dynamics
solar plasma dynamics
information theory
dynamic systems
turbulence
sun–earth relationship
magnetospheric and ionospheric plasma dynamics

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11 pages, 2998 KiB

Open AccessArticle

Simulations of the Characteristics of the Entropy Mode in Dipole-Magnetic-Confined Plasmas

by Liang Qian, Zhibin Wang, Jian Chen, Aohua Mao, Yi Yv, Qiuyue Nie and Xiaogang Wang

Entropy 2023, 25(11), 1481; https://doi.org/10.3390/e25111481 - 26 Oct 2023

Viewed by 901

Abstract

Plasmas confined in a dipole magnetic field widely exist in both space and laboratories, and this kind of plasma draws much attention from researchers both in plasma physics and in space science. In this paper, the characteristics of the collisionless electrostatic instability of the entropy mode in a dipole-magnetic-confined plasma are simulated with the linear gyrokinetic model. It is found that the entropy mode can be generated in dipole-magnetic-confined plasmas, and there are two typical stages of the entropy mode, with another transitional stage at different values of η. The main instability changes from the ion diamagnetic drift to the electronic diamagnetic drift as η becomes larger. In addition, the MHD mode predicts that the most stable point is at η~2/3 when k_⊥ρ_i << 1. However, we find that η and k_⊥ρ_i are coupled with each other, and the most stable point of the mode moves gradually to η~1 as k_⊥ρ_i increases. There is a peak value for the entropy mode growth rate around k_⊥ρ_i~1.0, and more complicated modes are induced so that the dispersion relation has been changed when the driving force of the plasma pressure gradient effect is obvious. For example, the characteristics of the interchange-like modes gradually emerge when the driving effect of the plasma pressure becomes stronger. Further investigations should be taken to reveal the characteristics of the entropy mode in magnetospheric plasmas. Full article

(This article belongs to the Special Issue Applications of Information Theory in Solar and Space Plasma Physics)

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