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| Titel |
Effects of various velocity drivers on MHD wave propagation in the partially ionized solar atmosphere from 2D multi-fluid simulations |
| VerfasserIn |
Yana Maneva, Alejandro Alvarez Laguna, Andrea Lani, Stefaan Poedts |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250152174
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| Publikation (Nr.) |
 EGU/EGU2017-16982.pdf |
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| Zusammenfassung |
| Partial ionization effects related to electron-neutral and ion-neutral interactions play an
important role in the weakly ionized solar chromosphere, where the number density of
neutrals vastly exceeds the number density of protons. The interactions between the
magnetized plasma and the neutral particles can significantly change the resistivity of the
plasma and lead to additional heating. Such multi-species interactions cannot be described
within the simple MHD single fluid models and the non-equilibrium partial ionization
effects cannot be properly captured even when generalized MHD models including
Ambipolar diffusion terms are taken into account. A more detailed approach to
describe these processes in the solar chromosphere is to use multi-fluid numerical
simulations where the neutrals and the plasma species are described as separate
fluids, coupled through the chemical reactions, additional currents, friction and
resistivity terms. In this study we have elaborate on our previous results and perform 2D
two-fluid simulations with an electron-proton fluid and a separate neutral fluid using
an improved model where the density and temperature dependence of the plasma
viscosities and heat conduction for the neutrals is assumed. Previously we have
investigated the chromospheric propagation of fast and slow waves generated by
a fixed photospheric foot-point velocity driver. In this study we have varied the
velocity driver’s frequency and location. We have also distinguished between the
types of drivers which excite pure slow/Alfvén waves or a mixture of slow and
fast waves. Finally, we have studied the non-uniform heating caused by the waves. |
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