SCD News > Announcement: October 13, 2005

IMAGe/GTP joint seminar October 28: "Recent developments in Magnetic Reconnection Theory: applications to space and laboratory plasmas"

Presented by:

Amitava Bhattacharjee
Space Science Center
Institute for the Study of Earth, Oceans, and Space
University of New Hampshire

Date, time, location:

Friday, October 28, 2005
1:30 p.m.
Foothills Bldg. 2, Room 1001

Abstract

Recent developments in the theory of nonlinear collisionless reconnection hold the promise for providing solutions to some outstanding problems space and laboratory plasma physics. Examples of such problems are sawtooth oscillations in tokamaks, magnetotail substorms, and impulsive solar (or stellar) flares. In each of these phenomena, a long-standing issue has been the identification of fast reconnection rates that are insensitive to the magnitude of the plasma resistivity. Furthermore, these phenomena often exhibit a “trigger”---the magnetic field configuration evolves slowly for a long period of time, only to undergo a sudden dynamical change over a much shorter period of time.

In this talk, I will demonstrate that these phenomena can be viewed from a common theoretical perspective based on a Hall MHD reconnection model. Predictions of theory and simulation will be compared with observations. I will also report on some new developments in fully three-dimensional reconnection models of the magnetosphere and the solar corona.

For more information, contact Liz Rothney at x1351, rothney@ucar.edu