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Building a Weakly Outgassing Comet from a Generalized Ohm's Law
Univ Colorado, LASP, Boulder, CO 80303 USA;NASA, Inst Modeling Plasma Atmospheres & Cosm Dust, SSERVI, Moffett Field, CA 94035 USA.
CNRS, LPC2E, F-45071 Orleans, France;Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Nice, France.
St Petersburg State Univ, Phys Dept, St Petersburg 198504, Russia.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0003-2926-6761
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2019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 123, no 5, article id 055101Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 123, no 5, article id 055101
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-393346DOI: 10.1103/PhysRevLett.123.055101ISI: 000479003800007OAI: oai:DiVA.org:uu-393346DiVA, id: diva2:1355187
Funder
The European Space Agency (ESA), 4000119035/16/ES/JDAvailable from: 2019-09-27 Created: 2019-09-27 Last updated: 2019-09-27Bibliographically approved

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Eriksson, Anders

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