Aspects of an Extended-Tail Theorem Supported by two Zero-IMF Computer Simulation Studies

Details Aspects of an Extended-Tail Theorem Supported by two Zero-IMF Computer Simulation Studies Aspects of an Extended-Tail Theorem Supported by two Zero-IMF Computer Simulation Studies

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0594w&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0594

Physics

2744 Magnetotail

Scientific paper

Two relatively recent zero-IMF MHD computer simulation studies have confirmed that in the absence of an IMF the magnetosphere would still have a very long tail (over 100 RE according to Kageyama et al, JGR, p 3922, 1992, and over 300 RE according to Sonnerup et al, JGR, p 29,419, 2001). These studies strongly imply that flux transfer back into the tail is accomplished by field-line rotation back along the equatorial flanks rather than up over the polar cap as assumed in the Dungey 'reconnection' hypothesis. Finally, it is suggested that during this transfer of flux back into the tail during the pre-substorm buildup, field lines cross regions of normally field-free space where the consequent rapid rise in field strength will Betatron-accelerate solar-wind plasma there to plasma-sheet and auroral energies (cf. Kageyama et al, their Plate 1 and Figure 6- this energy input occurred at t = 1.52 hours, well before the beginning of the sub-storm 'main-phase' plasmoid event at 2.03 hours).

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