Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh23b1837g&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH23B-1837
Astronomy and Astrophysics
Astrophysics
[7513] Solar Physics, Astrophysics, And Astronomy / Coronal Mass Ejections
Scientific paper
We present a novel analysis of the expansion properties of Coronal Mass Ejections (CMEs) in the inner corona. This methodology uses measurements of ionic charge states of C, O, Si, and Fe from the Advanced Composition Explorer (ACE) and interprets them in the context of a quantitative ionization model. All observed charge state distributions exhibit signatures of substantial heating, yet to varying degrees, reflecting peculiar properties of the frozen-in ions despite a common expansion profile. For example, the vast majority of ICMEs exhibit bi-modal Fe charge state distributions. Using a plasma heating and expansion model, in-situ charge states are translated into constraints on the heating and expansion profiles of the CME plasma. We find that CMEs are first heated up to ~3 MK near the Sun and with a maximum electron density between ~5e9 and 8.5e9 cm^-3 then followed by rapid expansion and cooling, These CMEs exhibit frozen-in charge states qualitatively and quantitatively consistent with our observations.
Antiochos Spiro K.
Gruesbeck Jacob R.
Lepri Susan T.
Zurbuchen Thomas
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