Drifting field-aligned density structures in the night-side polar cap

Details Drifting field-aligned density structures in the night-side polar cap Drifting field-aligned density structures in the night-side polar cap

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3206106s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 6, CiteID L06106

Physics

1

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Plasma Convection (2463), Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Polar Cap Phenomena, Radio Science: Magnetospheric Physics (2700)

Scientific paper

Spatio-temporal properties of density irregularities in the night-side polar cap are inferred from multi-point observations of auroral hiss at a radial distance of 5 Earth radii. In this case study, we use high resolution data of the wave instruments onboard the four Cluster spacecraft to estimate the local plasma density, obtaining values close to 1 cm-3 with density depletions decreasing down to 0.15 cm-3. Combined analysis in different points in space conclusively shows for the first time that these density structures are field-aligned and that they predominantly drift in the anti-sunward direction at speeds of a few km/s. This corresponds to a dawn-to-dusk convection electric field of approximately 1 mV/m. The transverse dimension of the observed density depletions, mapped down to the ionospheric heights, is of the order of a few tens of km. Their lifetime is probably longer than tens of seconds.

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