Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1027s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Sept. 1989, p. 1027-1030.
Physics
9
Geomagnetic Tail, Ion Motion, Magnetic Field Reconnection, Particle Acceleration, Helium Ions, Hydrogen Ions, Oxygen Ions, Polar Substorms, Positive Ions
Scientific paper
AMPTE/IRM measurements during a period of strong magnetic activity on April 8, 1985 exhibit a significant hardening of the energy spectra of the ion species H(+), He(2+), He(+), and O(+) following substorm expansion. In order to explain these observations in the framework of the substorm neutral line model, single-particle trajectories of H(+), He(2+), and O(+) are followed numerically in the time-dependent electric and magnetic fields obtained from a two-dimensional MHD simulation of magnetotail reconnection. Current-sheet acceleration of a suitable plasma sheet ion distribution can explain the observed ordering of the flux increase of the various species in energy per charge. Starting from a cold lobe population, however, current-sheet acceleration cannot account for the differential ion intensities observed after substorm expansion.
Moebius Eberhard
Sachsenweger D.
Scholer Manfred
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