Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2869m&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 18, p. 2869-2872
Physics
8
Ionosphere: Auroral Ionosphere, Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Energetic Particles, Precipitating, Magnetospheric Physics: Numerical Modeling
Scientific paper
Recent observations by the FAST satellite have identified numerous occurrences in the downward auroral current region of fast solitary structures with a characteristic size of a few local Debye lengths. We utilize a 2.5D electrostatic particle-in-cell code to investigate the generation of such structures by the interaction of narrow energetic electron beams with a gravitationally-bound exponential atmosphere. Cold, narrow electron beams are injected from both the high-altitude and low-altitude edges of the simulation domain. Both upward and downward-going beams experience a strong beam-plasma instability yielding net positive potential structures. These structures, seen to be holes in electron phase space, then accelerate or decelerate along the density gradient. For the up-going beams, the potential structures escape from the initial region of intense interaction, after which they propagate surprisingly far. The down-going structures accelerate but become degraded and break up due to the finer scales present in the increased density region. The gradient-dependent acceleration therefore selects upward-going structures as likely to be more robust in the auroral region.
Coroniti Ferdinan V.
Mandrake Lukas
Pritchett Philip L.
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