Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3707102y&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 7, CiteID L07102
Physics
7
Magnetospheric Physics: Substorms, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Plasma Sheet
Scientific paper
We present a superposed epoch study to examine the entropy parameter PV5/3, for isolated substorms, pseudobreakups and convection bays observed by Geotail in the near-Earth plasma sheet, by using a flux-tube-volume formula with coefficients adjusted to fit magnetic field models for a variety of conditions. It is found that the changes of PV5/3 for these three types of events are distinct: (1) for substorms, PV5/3 increases continuously during the growth phase, decreases after dipolarization, and maintains a low value of ˜0.08 nPa(RE/nT)5/3; (2) for pseudobreakups, PV5/3 changes in a way similar to substorms, but decreases more moderately and then gradually increases; (3) for convection bays, PV5/3 takes a nearly constant value of 0.06 nPa(RE/nT)5/3. These results suggest that the characteristics of the processes that violate conservation of PV5/3 play a central role in the temporal and spatial reduction of PV5/3 and thus determine the earthward plasma transport during active times.
Erickson Gary M.
Toffoletto Frank R.
Wolf Richard A.
Yang Jaek-Jin
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