Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..177s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 3, p. 177-180.
Physics
22
Adiabatic Conditions, Atmospheric Electricity, Earth Magnetosphere, Magnetic Storms, Particle Trajectories, Storm Surges, Electric Fields, Hydrogen Ions, Ion Distribution, Oxygen Ions, Space Plasmas
Scientific paper
It is proposed that the nightside boundary between adiabatic and nonadiabatic regimes produced by convection surges separates two regions of substantially energized magnetospheric plasmas. It is shown that in regions where nonadiabaticity holds, pitch angle distributions are characterized by strong nearly field-perpendicular component. Strongly field-aligned distributions characterize the regions of adiabatic behavior. Injected plasmas are characterized by magnetic field-aligned ion distributions for energies below a few keV. Thus, unless additional processes are included, the proposed boundary between adiabatic and nonadiabatic behaviors cannot be interpreted as the substorm 'injection boundary'. The near-earth injected plasmas appear to be governed by adiabatic behavior.
Mauk Barry H.
Meng Ching I.
Sanchez Ennio R.
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