Helicity Build-up and the Role of CMEs

Details Helicity Build-up and the Role of CMEs Helicity Build-up and the Role of CMEs

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.6503r&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #65.03; Bulletin of the American Astronomical Society, Vol. 34, p.751

Physics

Scientific paper

Coronal mass ejections are often associated with interplanetary magnetic clouds, whose fields are regularly probed with sensitive magnetometers. The measurements reveal that magnetic cloud fields are helical, and each cloud carries helicity away from the sun. There is no known mechanism for returning helicity to the sun. This talk will survey the possible solar sources of magnetic helicity. Included are fieldline footpoint motions, effects of Coriolis forces, effects of convection, shear associated with differential rotation, and, of course, the internal dynamo. Besides the survey of possible mechanisms for helicity generation, we will consider the global view of the flow of helicity from the sun into interplanetary space. This work is supported by the NASA Solar and Heliospheric Physics Program under grant NAG5-7921.

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