Imaging the polar cap red-line shelf

Details Imaging the polar cap red-line shelf Imaging the polar cap red-line shelf

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11c0445j&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11C-0445

Other

2455 Particle Precipitation, 2475 Polar Cap Ionosphere, 2736 Magnetosphere/Ionosphere Interactions, 2776 Polar Cap Phenomena

Scientific paper

Sensitive all-sky imager (ASI) data from Rankin Inlet (PACE 73 N) can detect relatively weak red-line (630.0nm) emissions. These emissions are typically absent above a poleward boundary, rising to several hundred Rayleighs at lower latitudes. This ``shelf'' has been previously observed in meridian scanning photometer data. Blanchard et al. [JGR 1995] found that it corresponded to a boundary in the soft electron precipitation, at least in the evening sector. Others (e.g. Wanliss et al. [JGR 2000]) have consequently used the red-line shelf, as detected by MSPs, as a proxy for the polar cap boundary. However, ASI data clearly show that the red-line boundary is often dynamic and may be inclined with respect to L-shells. This talk will provide examples of ASI data, compared with coincident MSP observations and satellite overflights, in order to address the problem of identifing the polar cap boundary from ground-based optical data.

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