Magnetic field evolution during prominence eruptions and two-ribbon flares |
| |
| Authors: | E R Priest T G Forbes |
| |
| Institution: | (1) Space Science Center, Science Engineering Research Building, 03824 Durham, NH, U.S.A.;(2) Present address: Mathematical Sciences Dept., KY16 9SS North Haugh, St Andrews, Scotland |
| |
| Abstract: | Simple models for the MHD eruption of a solar prominence are presented, in which the prominence is treated as a twisted magnetic flux tube that is being repelled from the solar surface by magnetic pressure forces. The effects of different physical assumptions to deal with this magneto-hydrodynamically complex phenomenon are evaluated, such as holding constant the prominence current, radius, flux or twist or modelling the prominence as a current sheet. Including a background magnetic field allows the prominence to be in equilibrium initially with an Inverse Polarity and then to erupt due to magnetic non-equilibrium when the background magnetic field is too small or the prominence twist is too great. The electric field at the neutral point below the prominence rapidly increases to a maximum value and then declines. Including the effect of gravity also allows an equilibrium with Normal Polarity to exist. Finally, an ideal MHD solution is found which incorporates self-consistently a current sheet below the prominence and which implies that a prominence will still erupt and form a current sheet even if no reconnection occurs. When reconnection is allowed it is, therefore, driven by the eruption. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
