Analytical three-dimensional magnetohydrostatic equilibrium solutions for magnetic field extrapolation allowing a transition from non-force-free to force-free magnetic fields
| Autor: | Thomas Neukirch, Thomas Wiegelmann |
|---|---|
| Přispěvatelé: | Science & Technology Facilities Council, University of St Andrews. Applied Mathematics |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010504 meteorology & atmospheric sciences
Extrapolation FOS: Physical sciences Model parameters 7. Clean energy 01 natural sciences 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics QB Astronomy Magnetic fields photosphere QA Mathematics QA 010303 astronomy & astrophysics Chromosphere Solar and Stellar Astrophysics (astro-ph.SR) QC 0105 earth and related environmental sciences QB Physics Photosphere Magnetic fields models Magnetic fields corona Astronomy and Astrophysics Magnetic fields chromosphere 3rd-DAS Solar atmosphere Special class Corona Magnetic field Computational physics QC Physics Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Physics::Space Physics |
| Popis: | For the extrapolation of magnetic fields into the solar corona from measurements taken in the photosphere (or chromosphere) force-free magnetic fields are typically used. This does not take into account that the lower layers of the solar atmosphere are not force-free. While some numerical extrapolation methods using magnetohydrostatic magnetic fields have been suggested, a complementary and numerically comparatively cheap method is to use analytical magnetohydrostatic equilibria to extrapolate the magnetic field. In this paper, we present a new family of solutions for a special class of analytical three-dimensional magnetohydrostatic equilibria, which can be of use for such magnetic field extrapolation. The new solutions allow for the more flexible modelling of a transition from non-force-free to (linear) force-free magnetic fields. In particular, the height and width of the region where this transition takes place can be specified by choosing appropriate model parameters. 21 pages, 9 figures, accepted for publication in Solar Physics |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|