Ion Charge States in Halo Coronal Mass Ejections (CMEs) Detected by ACE

Astronomy and Astrophysics – Astronomy

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Scientific paper

In this talk we describe novel insights into the mechanism(s) that
initiate coronal mass ejections, inferred from analyses of the charge state distributions of various elements detected at 1 AU by ACE. Unusually high charge states are observed in Fe, while lower Z elements such as O are substantially unaffected by the CME environment. This requires that the CME plasma be initially relatively cool, and then be simultaneously heated as it is accelerated away from the solar surface. The location, magnitude and duration of this heating, as inferred from the charge states detected, offers novel insights into the explosion mechanism(s) for these events. The combined observations of in situ CME ions and remotely sensed CME morphology and expansion by the dual spacecraft of the STEREO mission will allow such techniques to be exploited to the full.
C.E.R is supported in this work by a National Research Council Fellowship at the Naval Research Laboratory.

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