Abstracts submitted by pascal demoulin
Quantitative links between CMEs and magnetic clouds
P. Démoulin
Paris Observatory, LESIA
Magnetic clouds, and more generally 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 magnetic clouds, 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. This approach is rewarding since it brings new constraints on the CME process. |
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