Time-Dependent Two-Fluid Magnetohydrodynamic Model and Simulation of the Chromosphere
The Sun’s chromosphere is a highly dynamic, partially ionized region where spicules (hot jets of plasma) form. Here we present a two-fluid MHD model to study the chromosphere, which includes ion–neutral interaction and frictional heating. Our simulation recovers a magnetic-canopy shape that forms quickly, but it is also quickly disrupted by the formation of a jet. Our simulation produces a shock self-consistently, where the jet is driven by the frictional heating, which is much greater than the ohmic heating. Thus, our simulation demonstrates that the jet could be driven purely by thermal effects due to ion–neutral collisions and not by magnetic reconnection. We plan to improve the model to include photo-chemical effects and radiation.
KeywordsChromosphere, Models Jets
We thank an unknown referee for useful comments and suggestions. O. Cohen was supported by NASA Living with a Star grant number NNX16AC11G. J. Tu and P. Song were supported by NSF grants AGS-1702134 and AGS-1559717.
Disclosure of Potential Conflicts of Interest
The authors declare that they have no conflicts of interest.
- De Pontieu, B., McIntosh, S., Hansteen, V.H., Carlsson, M., Schrijver, C.J., Tarbell, T.D., Title, A.M., Shine, R.A., Suematsu, Y., Tsuneta, S., Katsukawa, Y., Ichimoto, K., Shimizu, T., Nagata, S.: 2007, A tale of two spicules: the impact of spicules on the magnetic chromosphere. Publ. Astron. Soc. Japan 59, S655. DOI. ADS. CrossRefGoogle Scholar
- Fox, N.J., Velli, M.C., Bale, S.D., Decker, R., Driesman, A., Howard, R.A., Kasper, J.C., Kinnison, J., Kusterer, M., Lario, D., Lockwood, M.K., McComas, D.J., Raouafi, N.E., Szabo, A.: 2016, The solar probe plus mission: humanity’s first visit to our star. Space Sci. Rev. 204, 7. DOI. ADS. ADSCrossRefGoogle Scholar
- Leake, J.E., DeVore, C.R., Thayer, J.P., Burns, A.G., Crowley, G., Gilbert, H.R., Huba, J.D., Krall, J., Linton, M.G., Lukin, V.S., Wang, W.: 2014, Ionized plasma and neutral gas coupling in the sun’s chromosphere and Earth’s ionosphere/thermosphere. Space Sci. Rev. 184, 107. DOI. ADSCrossRefGoogle Scholar
- Martinez-Sykora, J., De Pontieu, B., Carlsson, M., Hansteen, V.H., Nóbrega-Siverio, D., Gudiksen, B.V.: 2017, Two-dimensional radiative magnetohydrodynamic simulations of partial ionization in the chromosphere. II. Dynamics and energetics of the low solar atmosphere. Astrophys. J. 847, 36. ADSCrossRefGoogle Scholar
- Sanderson, C., Curtin, R.: 2016, Armadillo: a template-based C++ library for linear algebra. arma.sourceforge.net.