Dayside proton aurora associated with magnetic impulse events: South Pole observations

Details Dayside proton aurora associated with magnetic impulse events: South Pole observations Dayside proton aurora associated with magnetic impulse events: South Pole observations

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11504301e&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A4, CiteID A04301

Physics

1

Ionosphere: Auroral Ionosphere (2704), Magnetospheric Physics: Magnetosphere: Outer, Magnetospheric Physics: Magnetopause And Boundary Layers, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

We present, for the first time, auroral hydrogen emission at 486.1 nm (proton aurora) associated with a magnetic impulse event (MIE) or a traveling convection vortex (TCV). The MIE (or TCV) is a transient phenomenon (˜5-15 min) characterized by a large amplitude (>50 nT) in the magnetic field disturbance occurring at 70°-80° magnetic latitudes (MLATs). Optical observations at the South Pole Station (-74.3° MLAT) showed a clear spot-like brightening of proton auroral emissions associated with MIEs. These spots of the proton aurora were ˜300-500 km in length and ˜150-200 km in width at an altitude of 150 km and lasted for ˜1-2 minutes. The spot drifted antisunward with a speed of ˜3-5 km/s but did not always drift. Quasi-stable spots coincided with poleward moving multiple arcs at 630.0 nm. There was no clear one-to-one correspondence between the spots and the power of the ground magnetic field in the Pc1 range. The variety of proton auroral emissions associated with MIEs may be a visible manifestation of the variety of processes that take place near the region generating a pair of field-aligned currents that drives MIEs.

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