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Simulating the Dynamics of Coronal Plasma Condensations

Published online by Cambridge University Press:  24 July 2018

Petra Kohutova Open the ORCID record for Petra Kohutova [Opens in a new window]  and
Erwin Verwichte Open the ORCID record for Erwin Verwichte [Opens in a new window]
Petra Kohutova
Affiliation:
Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, CV4 7AL, Coventry, UK email: [email protected]
Erwin Verwichte
Affiliation:
Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick, CV4 7AL, Coventry, UK email: [email protected]
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Abstract

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We present numerical MHD simulations of the dynamics of cool plasma condensations in a coronal loop. We address 2 mechanisms for how coronal rain leads to the excitation of coronal loop oscillations. We find that the combined effect of pressure gradients in the coronal loop plasma and magnetic tension force resulting from changes in magnetic field geometry explains observed sub-ballistic motion of coronal rain and longitudinal oscillations of the individual condensations. We also find that the condensations can excite sustained, small amplitude, vertically polarised transverse loop oscillations.

Keywords

Magnetohydrodynamics (MHD)Sun: coronaSun: oscillationsSun: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 23 - 25
Copyright
Copyright © International Astronomical Union 2018 

References

Arber, T. D., Longbottom, A. W., Gerrard, C. L. & Milne, A. M., 2001, J Comput Phys., 171, 151CrossRefGoogle Scholar
Kohutova, P. & Verwichte, E., 2016, ApJ, 827, 39Google Scholar
Kohutova, P. & Verwichte, E., 2017a, A&A, 602, A23Google Scholar
Kohutova, P. & Verwichte, E., 2017b, A&A, submittedGoogle Scholar
Verwichte, E., Antolin, P., Rowlands, G., Kohutova, P. & Neukirch, T., 2017, A&A, 598, A57Google Scholar
Verwichte, E. & Kohutova, P., 2017, A&A, 601, L2Google Scholar