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Rayleigh–Taylor instability in partially ionized prominence plasma

Published online by Cambridge University Press:  06 January 2014

E. Khomenko ,
A. Díaz ,
A. de Vicente ,
M. Collados  and
M. Luna
E. Khomenko
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain email: khomenko@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain
A. Díaz
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain email: khomenko@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain
A. de Vicente
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain email: khomenko@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain
M. Collados
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain email: khomenko@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain
M. Luna
Affiliation:
Instituto de Astrofísica de Canarias, 38205 La Laguna, Tenerife, Spain email: khomenko@iac.es Departamento de Astrofísica, Universidad de La Laguna, 38205, La Laguna, Tenerife, Spain
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Abstract

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We study Rayleigh–Taylor instability (RTI) at the coronal–prominence boundary by means of 2.5D numerical simulations in a single-fluid MHD approach including a generalized Ohm's law. The initial configuration includes a homogeneous magnetic field forming an angle with the direction in which the plasma is perturbed. For each field inclination we compare two simulations, one for the pure MHD case, and one including the ambipolar diffusion in the Ohm's law, otherwise identical. We find that the configuration containing neutral atoms is always unstable. The growth rate of the small-scale modes in the non-linear regime is larger than in the purely MHD case.

Keywords

InstabilitiesNumerical simulationsChromosphereMagnetic fieldsProminences
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S300: Nature of Prominences and their role in Space Weather , June 2013 , pp. 90 - 93
Copyright
Copyright © International Astronomical Union 2013 

References

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