Strong double layer in the downward current region.

Details Strong double layer in the downward current region. Strong double layer in the downward current region.

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm21a0768a&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM21A-0768

Physics

2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2451 Particle Acceleration, 2483 Wave/Particle Interactions, 2712 Electric Fields (2411)

Scientific paper

A direct observation of a strong double layer has been recorded in detail by the FAST satellite in the downward current region of the aurora. This presentation concentrates on a particular compelling example in which both the electric field and particle measurements clearly illustrate the detail characteristics of the double layer. Electrons with initial energies of about 50 eV are observed to be accelerated through the double layer into a beam of more than 750 eV. This beam is rapidly plateaued by intense wave turbulence into a extended power law distribution. This process forms accelerated `flat-top' electron distributions, which are represented of energized distributions in the downward current region. Ions are also observed to be accelerated by the double layer in the opposite direction of the electron beam. Ion conics on the low potential side of the double layer are trapped between the double layer and their mirror points. The double layer is observed to move up the magnetic field line, in the direction of the electron beam. In front of it, an ion population moves with the speed of the double layer suggesting an overshoot in the potential ramp. The intense wave turbulence on the high potential side is seen to transform into electron phase-space holes far away from the double layer.

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