University of Maryland
Atlantic Building, Room 2400
4:30 PM Monday, September 24, 2012
Coffee, Tea & Snacks 4:15-4:30 PM

Daniel B. Berdichevsky
Independent Scholar
Force Balance in the Evolution of a Class of ICMEs

The observation of: (a) coronal mass ejections (CMEs), and (b) in-situ of plasma and magnetic field properties during the 23th solar minimum with multiple spacecraft instruments allowed the identification of a class of CMEs that seems to travel away from the Sun in a way that is consistent with uniform motion. Here we present a possible explanation of these observations for a class of CMEs. We do that in the formalism of the magnetohydrodynamics (MHD). The implications for this assumption provide a simple connection between the poloidal magnetic field of the CME with its mass. In finding this novel solution, the shape of the CME is derived, showing a deviation from the simple circular cross-section for the magnetic flux-rope (FR) expansion free of interactions derived in Berdichevsky, Lepping and Farrugia, PR E67, 2003. Finally we present three applications of this model showing that it provide predictions of the mass of CMEs from mean density plasma measurements in the path of the CME, see also Berdichevsky, Solar Phys., accepted, 2012.

Sponsored by: Department of Physics and the Institute for Physical Science and Technology, University of Maryland. For information call Catha Stewart at (301) 405-4811 or go to the UMD Space Physics group seminar web site.

There is free parking after 4:00 PM in lot B (the big parking garage across the street from the ATL building). There are a limited number of spaces in lot Q next to the new ATL wing with free parking after 4PM even when there is a basketball game on campus.