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December 22, 2009 Chromospheric Magnetic Reconnection caused by Photospheric

Summary: December 22, 2009
Chromospheric Magnetic Reconnection caused by Photospheric
Flux Emergence: Implications for Jet-like Events Formation
J. Y. Ding1,2, M. S. Madjarska1, J. G. Doyle1, and Q. M. Lu2
Armagh Observatory, College Hill, Armagh BT61 9DG, N. Ireland
e-mail: jyd@arm.ac.uk
School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
Preprint online version: December 22, 2009
Magnetic reconnection in the low atmosphere, e.g. chromosphere, is investigated in various physical environments. Its implications
for the origination of explosive events (small­scale jets) are discussed. A 2.5-dimensional resistive magnetohydrodynamic (MHD)
model in Cartesian coordinates is used. It is found that the temperature and velocity of the outflow jets as a result of magnetic
reconnection are strongly dependent on the physical environments, e.g. the magnitude of the magnetic field strength and the plasma
density. If the magnetic field strength is weak and the density is high, the temperature of the jets is very low (104
K) as well as its
velocity (40 km s-1
). However, if environments with stronger magnetic field strength (20 G) and smaller density (electron density
Ne = 2 × 1010


Source: Armagh Observatory


Collections: Physics