A Drift-Kinetic Method for Obtaining Gradients in Plasma Properties From Single-Point Distribution Function Data

被引：2

作者：

Wetherton, B. A. ^{[1
]}

Egedal, J. ^{[1
]}

Montag, P. K. ^{[1
]}

Le, A. ^{[2
]}

Daughton, W. S. ^{[2
]}

机构：

[1] Univ Wisconsin, Dept Phys, 1150 Univ Ave, Madison, WI 53706 USA

[2] Los Alamos Natl Lab, Los Alamos, NM USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2020年 / 125卷 / 08期

关键词：

agyrotropy; drift kinetics; gradients; magnetic reconnection; magnetized;

D O I：

10.1029/2020JA027965

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper, we derive a new drift-kinetic method for estimating gradients in the plasma properties through a velocity space distribution at a single point. The gradients are intrinsically related to agyrotropic features of the distribution function. This method predicts the gradients in the magnetized distribution function and can predict gradients of arbitrary moments of the gyrotropic background distribution function. The method allows for estimates on density and pressure gradients on the scale of a Larmor radius, proving to resolve smaller scales than any method currently available to spacecraft. The model is verified with a set of fully kinetic VPIC particle-in-cell simulations.

引用

页数：10

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