MHD and kinetic aspects in solar wind modeling
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Discipline
Physical sciences
Subject
Boundary conditions
Distribution functions
Kinetics
Magnetohydrodynamics
Magnetoplasma
Sun
Wind
Heliocentric distances
Kinetic description
Kinetic treatment
Macroscopic variables
Plasma characteristics
Solar wind acceleration
Solar wind parameters
Suprathermal electrons
Solar wind
Audience
Scientific
Date
2016Metadata
Show full item recordDescription
We present solar wind modeling efforts with both magnetohydrodynamic (MHD) and kinetic treatments. An observation-driven MHD model is used to constrain a kinetic solar wind model with anisotropic kappa velocity distribution functions (VDF) for the electrons. Photospheric magnetograms serve as observational input in semi-empirical coronal models for estimating the plasma characteristics up to a heliocentric distance of 0.1AU. A full MHD model is employed for computing the three-dimensional evolution of the solar wind macroscopic variables up to 2AU. The results of the MHD model obtained at 0.1AU serve to constrain the parameters used in an exospheric kinetic solar wind model. The assumption of Maxwell and kappa VDF at the exobase, for protons and electrons respectively, is used to determine the solar wind solution using appropriate boundary conditions, estimated to obtain the best comparison with available observations at the Earth. The kinetic description sheds light on processes such as coronal heating and solar wind acceleration, that naturally appear by inclusion of suprathermal electrons in the model. We are focusing on the profile and variation of solar wind parameters, such as the solar wind speed, temperature and density at 1 AU, on characterizing the slow and fast source regions of the wind and on comparing its features with results of exospheric models in similar conditions. In order to compare MHD and kinetic approaches with observations, we start from similar boundary conditions at the 0.1AU and propagate the global kinetic solution up to 2AU.
Citation
Moschou, S.P.; Pierrard, V.; Keppens, R.; Pomoell, J. (2016). MHD and kinetic aspects in solar wind modeling. (Mantica, P., Ed.), EPS 2016 43rd European Physical Society Conference on Plasma Physics, Vol. 40A, 433-436,Identifiers
isbn: 978-1-5108-2947-3
scopus: 2-s2.0-85013922522
Type
Conference
Peer-Review
No
Language
eng