FIP Fractionation: Theory |
| |
Authors: | Jean-Claude Hénoux |
| |
Institution: | (1) Observatoire de Paris, DASOP/LPSH(URA2080), 92195 Meudon Principal Cedex, France |
| |
Abstract: | In this review, the main models of ion-neutral frationation leading to an enhancement of the low FIP to high FIP abundance
ratio in the corona or in the solar wind, are presented. Models based on diffusion parallel to the magnetic field are discussed;
they are highly dependent on the boundary conditions. The magnetic field, that naturally separates ions from neutrals moving
perpendicular to the field lines direction, when the ion-neutral frequency becomes lower than the ion gyrofrequency, is expected
to play an active role in the ion-neutral separation. It is then suggested that ion-neutral fractionation is linked to the
formation of the solar chromosphere, i.e. in magnetic flux-tubes at a temperature between 4000 and 6000 K.
This revised version was published online in June 2006 with corrections to the Cover Date. |
| |
Keywords: | Element Abundances FIP effect |
本文献已被 SpringerLink 等数据库收录! |
|