Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11605207y&link_type=abstract
Journal of Geophysical Research, Volume 116, Issue A5, CiteID A05207
Physics
8
Magnetospheric Physics: Substorms, Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Plasma Convection (2463)
Scientific paper
In this paper, we investigate the role of plasma sheet bubbles in the ion flux variations at geosynchronous orbit during substorm injections by using the Rice Convection Model with an equilibrated magnetic field model (RCM-E). The bubble is initiated in the near-Earth plasma sheet with a localized reduction in entropy parameter PV5/3 following a substorm growth phase. In the expansion phase, characteristic features of substorm injections are reproduced; that is, there is a prominent dispersionless flux increase for energetic protons (>40 keV) and a flux decrease for lower-energy protons near midnight geosynchronous orbit while there is dispersive flux enhancement near the dusk sector. We find that the injection boundary is well coincident with the earthward boundary of the bubble, inside which the depletion of plasma content causes the magnetic field dipolarization, and in return, the magnetic field collapse energizes particles and alters the drift paths dramatically. Our results also show that a high-PV5/3 island is pushed ahead of the fast earthward propagating bubble, and a dipolarization front forms between them. Within the high-PV5/3 island, the diamagnetic effect makes the plasma pressure increase and the strength of the magnetic field decrease to a local minimum. We suggest that plasma sheet bubbles are elementary vehicles of substorm time particle injections from the main plasma sheet to the inner magnetosphere.
Sazykin Stanislav
Toffoletto Frank R.
Wolf Richard A.
Yang Jaek-Jin
No associations
LandOfFree
RCM-E simulation of ion acceleration during an idealized plasma sheet bubble injection does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with RCM-E simulation of ion acceleration during an idealized plasma sheet bubble injection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and RCM-E simulation of ion acceleration during an idealized plasma sheet bubble injection will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-932379