Seminars

Lecturer: Jörgen Vedin (Dept. of Physics, Umeå University)
Date: 2007-05-15 10:00
Place: Aniara

Numerical modeling of auroral processes

Jörgen Vedin
Dept. of Physics
Umeå University
Forskarskolan

One of the most conspicuous problems in space physics for the last decades has been to theoretically describe how the large parallel electric fields on auroral field lines can be generated. There is strong observational evidence of such electric fields, and stationary theory supports the need for electric fields accelerating electrons to the ionosphere where they generate auroras. However, dynamic models have not been able to reproduce these electric fields. I will present a newly developed model of the auroral current circuit that produces large parallel electric fields balanced by strong electron pressure gradients. The chain of processes that results in these electric fields is discussed and some selected results of the model are presented.



Created 2007-05-07 12:11:17 by Mats Holmström
Last changed 2007-05-07 12:12:15 by Mats Holmström