Počet záznamů: 1  

Magneto-static Modeling of the Mixed Plasma Beta Solar Atmosphere Based on Sunrise/IMaX Data

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    0455505 - ASÚ 2016 RIV US eng J - Článek v odborném periodiku
    Wiegelmann, T. - Neukirch, A.J. - Nickeler, Dieter Horst - Solanki, S.K. - Martinez Pillet, V. - Borrero, J.M.
    Magneto-static Modeling of the Mixed Plasma Beta Solar Atmosphere Based on Sunrise/IMaX Data.
    Astrophysical Journal. Roč. 815, č. 1 (2015), 10/1-10/6. ISSN 0004-637X. E-ISSN 1538-4357
    Grant CEP: GA ČR GA13-24782S
    Institucionální podpora: RVO:67985815
    Klíčová slova: numerical methods * Sun chromosphere * Sun corona
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Impakt faktor: 5.909, rok: 2015

    Our aim is to model the three-dimensional magnetic field structure of the upper solar atmosphere, including regions of non-negligible plasma beta. We use high-resolution photospheric magnetic field measurements from SUNRISE/IMaX as the boundary condition for a magneto-static magnetic field model. The high resolution of IMaX allows us to resolve the interface region between the photosphere and corona, but modeling this region is challenging for the following reasons. While the coronal magnetic field is thought to be force-free (the Lorentz force vanishes), this is not the case in the mixed plasma β environment in the photosphere and lower chromosphere. In our model, pressure gradients and gravity forces are self-consistently taken into account and compensate for the non-vanishing Lorentz force. Above a certain height (about 2 Mm) the non-magnetic forces become very weak and consequently the magnetic field becomes almost force-free. Here, we apply a linear approach where the electric current density consists of a superposition of a field-line parallel current and a current perpendicular to the Sun's gravity field. We illustrate the prospects and limitations of this approach and give an outlook for an extension toward a nonlinear model.
    Trvalý link: http://hdl.handle.net/11104/0256086

     
     
Počet záznamů: 1  

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