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Pascal Demoulin   Submitted: 2007-09-21 09:55

Magnetic clouds (MCs), and more generally interplanetary coronal mass ejections (ICMEs), are believed to be the interplanetary counterparts of CMEs. The link has usually been shown by taking into account the CME launch position on the Sun, the expected time delay and by comparing the orientation of the coronal and interplanetary magnetic field. Making such a link more quantitative is challenging since it requires the relation of very different kinds of magnetic field measurements: (i) photospheric magnetic maps, which are observed from a distant vantage point (remote sensing) and (ii) in situ measurements of MCs, which provide precise, directly measured, magnetic field data merely from one-dimensional linear samples. The association between events in these different domains can be made using adequate coronal and MC models. Then, global quantities like magnetic fluxes and helicity can be derived and compared. All the associations criteria are reviewed, with a description of the general trends found. A special focus is given on the cases which do not follow the earlier derived mean laws since interesting physics is usually associated to them.

Authors: P. Demoulin
Projects: None

Publication Status: submitted to Annales Geophysicae (review)
Last Modified: 2007-09-24 04:02
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