Physics – Plasma Physics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...103.9299p&link_type=abstract
Journal of Geophysical Research, Volume 103, Issue A5, p. 9299-9308
Physics
Plasma Physics
18
Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Space Plasma Physics: Magnetic Reconnection
Scientific paper
Magnetosheath plasma injection events are frequently observed in the dayside oval. From the time dispersion characteristics of the injected magnetosheath ions it is possible to deduce the injection time of magnetosheath electrons. It is shown by means of specific examples taken from the Swedish Viking spacecraft data set, that this electron injection time occurs together with the generation of burst of broadband electrostatic noise (BEN). The overall duration of the BEN emissions lasts typically of the order of 1 min, probably representing the total duration of the injection events. This is within the same time domain as that inferred for flux transfer events (FTE). On a shorter timescale, BEN consists of a succession of very impulsive bursts which last a few seconds; this reveals the characteristic timescales of the elementary injection process. The BEN emissions appear to be the ``messengers'' of the reconnection process occurring along the magnetic field lines which are connected to the reconnection sites. The information is transmitted via solitary waves, probably of electron-acoustic type, and consisting of isolated potential wells. From the observations, the overall extension of the injection region at the magnetopause is estimated to be of the size of a large fraction of an Earth radius. However, plasma injection appears as a noncontinuous process that takes place in narrow spatially localized regions of the size of merely more than an ion gyroradius at the magnetopause.
Pottelette Raymond
Treumann Rudolf A.
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