Magnetic Helicity in Sigmoids, Coronal Mass Ejections and Magnetic Clouds

Details Magnetic Helicity in Sigmoids, Coronal Mass Ejections and Magnetic Clouds Magnetic Helicity in Sigmoids, Coronal Mass Ejections and Magnetic Clouds

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..105r&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

Filaments coronal mass ejections (CMEs) and magnetic clouds (MCs) all show signatures of twisted and writhing magnetic fields. CMEs are often associated with MCs whose fields are regularly probed with sensitive magnetometers. These measurements reveal that MC fields are helical and each cloud carries magnetic helicity away from the sun. It is more difficult to determine the helicity of the corresponding features - filaments and coronal structures - on the sun. This talk will survey helicity estimates of solar features including their hemispherical distributions and evidence for writhe and twist in the fields. The distribution of magnetic helicity in the solar atmosphere may provide important clues to the workings of the solar dynamo.

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