Interfacing MHD Single Fluid and Kinetic Exospheric Solar Wind Models and Comparing Their Energetics

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http://hdl.handle.net/10138/307524

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Moschou , S-P , Pierrard , V , Keppens , R & Pomoell , J 2017 , ' Interfacing MHD Single Fluid and Kinetic Exospheric Solar Wind Models and Comparing Their Energetics ' , Solar Physics , vol. 292 , no. 9 , 139 . https://doi.org/10.1007/s11207-017-1164-6

Title: Interfacing MHD Single Fluid and Kinetic Exospheric Solar Wind Models and Comparing Their Energetics
Author: Moschou, Sofia-Paraskevi; Pierrard, Viviane; Keppens, Rony; Pomoell, Jens
Other contributor: University of Helsinki, Department of Physics

Date: 2017-09
Language: eng
Number of pages: 25
Belongs to series: Solar Physics
ISSN: 0038-0938
DOI: https://doi.org/10.1007/s11207-017-1164-6
URI: http://hdl.handle.net/10138/307524
Abstract: An exospheric kinetic solar wind model is interfaced with an observation-driven single-fluid magnetohydrodynamic (MHD) model. Initially, a photospheric magnetogram serves as observational input in the fluid approach to extrapolate the heliospheric magnetic field. Then semi-empirical coronal models are used for estimating the plasma characteristics up to a heliocentric distance of 0.1 AU. From there on, a full MHD model that computes the three-dimensional time-dependent evolution of the solar wind macroscopic variables up to the orbit of Earth is used. After interfacing the density and velocity at the inner MHD boundary, we compare our results with those of a kinetic exospheric solar wind model based on the assumption of Maxwell and Kappa velocity distribution functions for protons and electrons, respectively, as well as with in situ observations at 1 AU. This provides insight into more physically detailed processes, such as coronal heating and solar wind acceleration, which naturally arise from including suprathermal electrons in the model. We are interested in the profile of the solar wind speed and density at 1 AU, in characterizing the slow and fast source regions of the wind, and in comparing MHD with exospheric models in similar conditions. We calculate the energetics of both models from low to high heliocentric distances.
Subject: Solar wind
dynamics
Magnetic fields
Plasma
MHD
kinetic
CORONAL MASS EJECTIONS
MAGNETIC-FIELD
3-DIMENSIONAL PROPAGATION
ION-EXOSPHERE
TEMPERATURE
EXPANSION
FLOW
STREAMER
ENERGY
SPEED
115 Astronomy, Space science
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