Incoherent scatter radar observations of the cusp acceleration region and cusp field-aligned currents

Details Incoherent scatter radar observations of the cusp acceleration region and cusp field-aligned currents Incoherent scatter radar observations of the cusp acceleration region and cusp field-aligned currents

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10326721n&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A11, p. 26721-26730

Physics

8

Ionosphere: Electric Fields, Ionosphere: Ionosphere/Magnetosphere Interactions, Ionosphere: Plasma Temperature And Density, Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers

Scientific paper

Incoherent scatter radar measurements are used to study the E region and lower F region in the cusp proper. At the equatorward edge of the cusp a region of enhanced ionization is found, indicating precipitation of either electrons of about 1 keV energy or protons of about 3 keV. The signature is found at the same altitude, around 150 km, as the maximum of the solar EUV produced ionization, but is clearly recognizable. The position and likely proton energies indicate that this is probably the ionospheric signature of the cusp acceleration region. Regions of low electron densities are also found in the same altitude region, which may be explained by downward field-aligned currents causing depletions in the E and lower F region. First-order estimates show that dense field-aligned currents are needed to cause the observed depletions, possibly as dense as 30 μA/m2. The ionization in the cusp acceleration region, and the depletion caused by downward field-aligned currents both influence the Pedersen conductivity of the ionosphere, and the resulting conductivity gradients strongly influence the small-scale field-aligned currents flowing in the cusp region.

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