Resistivity due to weak double layers - A model for auroral arc thickness

Details Resistivity due to weak double layers - A model for auroral arc thickness Resistivity due to weak double layers - A model for auroral arc thickness

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2159p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 21, p. 2159-2162.

Physics

4

Atmospheric Physics, Auroral Arcs, Electrical Resistivity, Thickness, Atmospheric Models, Magnetosphere-Ionosphere Coupling, Momentum Transfer, Particle Acceleration

Scientific paper

We have calculated the resistivity due to a sequence of fluctuating weak double layers aligned parallel to the ambient magnetic field line. The average response of an electron drifting through a 1D randomly oriented array of WDLs is studied using a test particle approach. The average is taken over the randomly fluctuating values of the electric field associated with the double layers. Based on our calculations, we estimate that a 350 eV electron energy the thickness of the visual auroral arc is about 2.5 km and that of the auroral fine structure as about 250 m when mapped down to the ionosphere. The significance of our calculations is discussed in the context of magnetosphere-ionosphere coupling.

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