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ASTROMULTISCALE

Multiscale dynamics of astrophysical plasmas: pressure-anisotropy-driven instabilities and large-scale dynamical processes

Total Cost €

EC-Contrib. €

Partnership

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Outcomes and
results

ASTROMULTISCALE project word cloud

Explore the words cloud of the ASTROMULTISCALE project. It provides you a very rough idea of what is the project "ASTROMULTISCALE" about.

coupling phenomena unstable marginally anticipated thermalization compression wind dynamical spontaneously kinetic description microphysics models cluster stress planetary fluids influence simulations physics particle stellar entire systematic magnetospheres saturation investigation multiscale caused answers analogous setup fluid setups numerical plasma tensor feedback possibility interactions cascade validated simulation environments galaxy deeper stable triggered framework viscous anisotropic solar viscosity opens primary plasmas mirror anisotropy waves nonlinear pressure spacecraft instabilities wave stresses turbulent winds collisionality modeling macrophysical dynamics purpose turbulence of expansion firehose microinstabilities virtual experimental questions transport regime

Project "ASTROMULTISCALE" data sheet

The following table provides information about the project.

Coordinator	THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD Organization address address: WELLINGTON SQUARE UNIVERSITY OFFICES city: OXFORD postcode: OX1 2JD website: www.ox.ac.uk contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.
Coordinator Country	United Kingdom [UK]
Project website	https://sites.google.com/view/astromultiscale
Total cost	195˙454 €
EC max contribution	195˙454 € (100%)
Programme	1. H2020-EU.1.3.2. (Nurturing excellence by means of cross-border and cross-sector mobility)
Code Call	H2020-MSCA-IF-2014
Funding Scheme	MSCA-IF-EF-ST
Starting year	2015
Duration (year-month-day)	from 2015-06-01 to 2017-05-31

Partnership

Take a look of project's partnership.

#	participants	country	role	EC contrib. [€]
1	THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD THE CHANCELLOR, MASTERS AND SCHOLARS OF THE UNIVERSITY OF OXFORD Organization address address: WELLINGTON SQUARE UNIVERSITY OFFICES city: OXFORD postcode: OX1 2JD website: www.ox.ac.uk contact info title: n.a. name: n.a. surname: n.a. function: n.a. email: n.a. telephone: n.a. fax: n.a.	UK (OXFORD)	coordinator	195˙454.00

Map

Project objective

The primary purpose of the proposed project is a deeper understanding of instabilities in plasmas and their influence on transport phenomena and large-scale dynamical processes. The studies will be focused on nonlinear regime of development of the firehose and mirror instabilities triggered by pressure anisotropy spontaneously generated in stellar-wind environments by large-scale expansion/compression effects and plasma turbulence. Recent studies of microphysics of the instabilities have provided systematic knowledge on saturation effects in nonlinear regime and related wave-particle interactions. This opens a possibility of investigation of a feedback between the microphysics and large-scale dynamics. The project is anticipated to provide answers to the questions: what is the effective collisionality of a pressure-anisotropic plasma that is unstable or marginally stable to the firehose and mirror instabilities and how does it change the effective pressure tensor (viscous stress) used in fluid description of plasmas?

Results of the project are expected to be important for general plasma physics as related to the problem of multiscale phenomena in plasmas and coupling between microphysics and macrophysical processes. In particular, the results can help in better understanding of the dynamics of galaxy cluster plasmas, dynamical processes in stellar winds and planetary magnetospheres.

The studies will be done by numerical simulations using state-of-the-art kinetic and fluid models of plasma dynamics. A numerical setup will be developed analogous to experimental setups used for classical viscosity measurements in fluids. This virtual setup will be used to measure stresses caused by development of instabilities in plasmas. A related problem of thermalization of microinstabilities into kinetic waves cascade will be also investigated. The entire modeling framework will be validated by comparison of simulation results with spacecraft measurements in turbulent solar wind.

Publications

List of publications.
year	authors and title	journal	last update
2016	P. Helander, M. Strumik, A. A. Schekochihin Constraints on dynamo action in plasmas published pages: , ISSN: 0022-3778, DOI: 10.1017/S0022377816000982	Journal of Plasma Physics 82/06	2019-07-23
2017	Marek Strumik, Krzysztof Stasiewicz Multidimensional Hall magnetohydrodynamics with isotropic or anisotropic thermal pressure: Numerical scheme and its validation using solitary waves published pages: 846-862, ISSN: 0021-9991, DOI: 10.1016/j.jcp.2016.10.058	Journal of Computational Physics 330	2019-07-23

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