Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21b0543b&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM21B-0543
Physics
2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating
Scientific paper
In a recent auroral campaign at Churchill, Canada (69.5° invariant), we operated the University of Calgary's Portable Auroral Imager (PAI - see Trondsen and Cogger [JGR, pages 363-378, 1997]), and a new high time resolution photometer. The photometer was operated with a filter that blocked out long lived auroral emissions (eg., 557 nm and 630 nm) and took data at a rate of 1 kHz. Between 0300 and 0400 UT, corresponding to the local premidnight sector, the latitude profile of the aurora (determined from CANOPUS All-Sky Imager and Merdidian Scanning Photometer data) was characterized by very dim (several hundreds of Rayleighs), diffuse electron aurora, and correspondingly dim (~10 Rayleigh) proton aurora. At the same time, the high space and time resolution PAI data show the weak electron aurora to be structured on scales sizes of hundreds of meters. Furthermore, the high time resolution photometer recorded a sequence of 17 second period auroral pulsations spanning tens of minutes. Here, we present the pulsating aurora photometer and PAI data, within the larger scale context provided by the the CANOPUS ground-based instruments. In particular, we explore the location of this pulsating aurora relative to the larger scale proton and electron aurora.
Ball M. G.
Diep Hung
Donovan Eric
Knudsen D.
Trondsen Trond
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