Helicity of Magnetic Clouds and Their Associated Active Regions

Details Helicity of Magnetic Clouds and Their Associated Active Regions Helicity of Magnetic Clouds and Their Associated Active Regions

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..132l&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

Magnetic clouds are closely associated with Coronal Mass Ejections (CMEs). Most CMEs are associated with active regions. What is the relationship between the topology of these clouds and the associated active region? For our purposes magnetic clouds can be modeled adequately by a cylindrical force-free magnetic configuration (Lepping 1990). We have modeled the magnetic field topology of 14 magnetic clouds and their associated active regions to determine values of the force-free field parameter for both as well as total currents and fluxes. We find that the number of turns of the magnetic field in the full length of the cloud is typically an order of magnitude greater than the same quantity in the associated active region. This finding compels us to reject models of flux rope formation that do not invoke magnetic reconnection and helicity conservation.

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