Evaluation of the High Latitude Magnetic Conjugacy of Auroral Features Based on DE-1 and Viking Data

Details Evaluation of the High Latitude Magnetic Conjugacy of Auroral Features Based on DE-1 and Viking Data Evaluation of the High Latitude Magnetic Conjugacy of Auroral Features Based on DE-1 and Viking Data

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0808m&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0808

Physics

2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions, 2788 Storms And Substorms

Scientific paper

Magnetic Conjugacy studies are of general interest because of their implications concerning the processes that electrically couple the magnetosphere and ionosphere. Early optical studies of auroral conjugacy from the ground and aircraft have shown the general similarity in spatial and temporal development in the Northern and Southern hemispheres, with good conjugacy at minimum activity that decreased with increasing activity. However, few opportunities for simultaneous large-scale imaging in both hemispheres have been available for study. One significant opportunity occurred in 1986 with the overlap in the DE-1 and Viking programs when DE-1 was able to observe the southern hemisphere while Viking was observing the Northern hemisphere. From 48 days of imaging during the March-October time period when coincidences occurred, the morphology of high latitude features during all ranges of activity have been analyzed and when possible compared to IMF data. Four major categorizations seem to occur : 1) clearly conjugate features implying similar topologies and precipitation patterns; 2) conjugate features implying similar topologies, but with distinct differences in precipitation characteristics; 3) features that occur in both hemispheres but at different MLT; and 4) features that appear in only one hemisphere. In this latter category the focus is on large scale (> 500 km) features for which no identifiable counterpoint could be found. The foundation analysis of simultaneous observations is discussed in a companion paper.

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