Observational Evidence of Wave Turbulence That Can Support Field-Aligned Electric Fields in the Downward Birkeland Current Region

Details Observational Evidence of Wave Turbulence That Can Support Field-Aligned Electric Fields in the Downward Birkeland Current Region Observational Evidence of Wave Turbulence That Can Support Field-Aligned Electric Fields in the Downward Birkeland Current Region

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm21a1886l&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM21A-1886

Physics

[2483] Ionosphere / Wave/Particle Interactions, [2704] Magnetospheric Physics / Auroral Phenomena, [2712] Magnetospheric Physics / Electric Fields, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems

Scientific paper

Recently, we have demonstrated that the long-range parallel electric fields in the downward current region of the aurora are supported by a combination of pressure gradients, mirror force, and anomalous heating (but not anomalous resistivity) due to wave turbulence [1-4]. In this paper, we show examples of auroral passes from the FAST satellite where electrostatic ion cyclotron waves contribute substantially to this turbulence even when other wave modes are present. We show that, by using satellite data as a boundary condition for the model and making a few reasonable assumptions about the distribution of wave activity with altitude, we can predict the parallel electric fields over a range of thousands of kilometers, from the estimated average location of the double layer to altitudes where the dipole approximation starts to break down. [1] J. R. Jasperse et al. (2006), Phys. Plasmas 13, 072903. [2] J. R. Jasperse et al. (2006), Phys. Plasmas 13, 112902. [3] J. R. Jasperse et al. (2010), Phys. Plasmas 17, 062903. [4] J. R. Jasperse et al. (2010), Phys. Plasmas 17, 062904.

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