Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31c..03c&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM31C-03
Physics
2455 Particle Precipitation, 2704 Auroral Phenomena (2407)
Scientific paper
Simultaneous FUV-wavelength imaging of the northern and southern auroral regions was carried out in 1986, respectively, with the Dynamics Explorer 1 and Viking spacecraft. Viking provided images in a 2-D CCD format at an average sample period of a minute, whereas a DE-1 image was assembled in up to 12 minutes via a spin-scan technique. Collaborative scheduling of in-flight imaging operations enhanced the opportunity for simultaneous observations, with 62 imaging intervals successfully identified in post-flight analysis. Initial quantitative analysis includes one special case of simultaneous imaging of the Northern Hemisphere from both platforms to assist in response cross calibration. Numerous cases exist for which well-defined low- and/or high-latitude boundaries are present (i.e., strong latitudinal spatial gradients in brightness) for quantitative evaluation of positional measurements and magnetic mapping in a domain where strong magnetic conjugacy is expected. The mapping is also tested quantitatively with increasing latitude of observation using the Tsyganenko 1987 model with the 1985 IGRF internal field updated to imaging dates. The results of these mappings are presented for a high-latitude geomagnetic environment that varies from quiescent to active. A companion paper extends the analysis into the realm of non-conjugate phenomena asymmetric about the magnetic poles and also to examples for which there is simply no correspondence between auroral features in the two hemispheres.
Craven John D.
Murphree John S.
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