CDAW 9 analysis of magnetospheric events on May 3, 1986 - Event C

Details CDAW 9 analysis of magnetospheric events on May 3, 1986 - Event C CDAW 9 analysis of magnetospheric events on May 3, 1986 - Event C

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3815b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A3, p. 3815-3834.

Physics

66

Auroras, Magnetospheric Instability, Polar Substorms, Dynamics Explorer 1 Satellite, High Temperature Plasmas, Magnetic Signatures, Solar Wind

Scientific paper

An intense geomagnetic substorm event on May 3, 1986, occurring toward the end of a strong storm period, is studied. The auroral electrojet indices and global imaging data from both the Northern and Southern Hemispheres clearly revealed the growth phase and expansion phase development for a substorm with an onset at 0111 UT. An ideally located constellation of four spacecraft allowed detailed observation of the substorm growth phase in the near-tail region. A realistic time-evolving magnetic field model provided a global representation of the field configuration throughout the growth and early expansion phase of the substorm. Evidence of a narrowly localized substorm onset region in the near-earth tail is found. This region spread rapidly eastward and poleward after the 0111 UT onset. The results are consistent with a model of late growth phase formation of a magnetic neutral line. This reconnection region caused plasma sheet current diversion before the substorm onset and eventually led to cross-tail current disruption at the time of the substorm onset.

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