Building a weakly outgassing comet from a generalized Ohm’s law

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Title: Building a weakly outgassing comet from a generalized Ohm’s law
Authors: Deca, J
Henri, P
Divin, A
Eriksson, A
Galand, M
Beth, A
Ostaszewski, K
Horányi, M
Item Type: Journal Article
Abstract: When a weakly outgassing comet is sufficiently close to the Sun, the formation of an ionized coma results in solar wind mass loading and magnetic field draping around its nucleus. Using a 3D fully kinetic approach, we distill the components of a generalized Ohm’s law and the effective electron equation of state directly from the self-consistently simulated electron dynamics and identify the driving physics in the various regions of the cometary plasma environment. Using the example of space plasmas, in particular multispecies cometary plasmas, we show how the description for the complex kinetic electron dynamics can be simplified through a simple effective closure, and identify where an isotropic single-electron fluid Ohm’s law approximation can be used, and where it fails.
Issue Date: 1-Aug-2019
Date of Acceptance: 13-Jun-2019
URI: http://hdl.handle.net/10044/1/72728
DOI: https://doi.org/10.1103/PhysRevLett.123.055101
ISSN: 0031-9007
Publisher: American Physical Society (APS)
Start Page: 055101-1
End Page: 055101-7
Journal / Book Title: Physical Review Letters
Volume: 123
Issue: 5
Copyright Statement: © 2019 American Physical Society.
Sponsor/Funder: Imperial College Trust
Science and Technology Facilities Council (STFC)
Science and Technology Facilities Council (STFC)
Funder's Grant Number: N/A
ST/K001051/1
ST/N000692/1
Keywords: 02 Physical Sciences
General Physics
Publication Status: Published
Article Number: 055101
Online Publication Date: 2019-08-01
Appears in Collections:Space and Atmospheric Physics
Physics



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