Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1685s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1685
Mathematics
Logic
2744 Magnetotail, 2790 Substorms
Scientific paper
Substorms at Earth and CMEs on the Sun are relatively accessible examples of the explosive energy conversion phenomenon in the heliosphere. This talk reports on a project to determine whether these two examples might have an underlying common cause. There are two generic types of onset mechanisms: microscale instability and macroscale instability. The microscale option takes the form, for example, of a sudden onset of rapid magnetic reconnection and receives considerable attention by the substorm community. The macroscale option takes the form, for example, of a sudden onset of rapid expulsion when the threshold for a non-equilibrium, macro-instability is exceeded. This option appears more commonly in CME research. The two options have clear phenomenological signatures: in the former, rapid reconnection precedes expulsion; in the latter, expulsion precedes rapid reconnection. The latter scenario has been shown to operate in numerical MHD models of CME onset. Here we report on what MHD models say about the relative timing of rapid reconnection and plasmoid expulsion in the geotail.
Kuznetsova Masha
Siscoe George L.
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