Dayside optical observations of high latitude plasma structures

Details Dayside optical observations of high latitude plasma structures Dayside optical observations of high latitude plasma structures

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa52a0390p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA52A-0390

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection, 2467 Plasma Temperature And Density, 2475 Polar Cap Ionosphere, 2724 Magnetopause, Cusp, And Boundary Layers

Scientific paper

All-sky imagers were operated at Qaanaaq and Nord Greenland in conjunction with the EISCAT Svalbard Radar during the Millenium Polar Max campaign in January 2001. On 20 Jan 2001 a number of polar cap patches were observed forming near the cusp between Svalbard and Nord and then convecting antisunward into the central polar cap. The optical signature of these density enhancements over Nord took the appearance of elongated fingers of brighter airglow injected longitudinally from the east into the cusp region after which they convected steadily antisunward and crossed into the Qaanaaq field of view. Image data from Qaanaaq showed the longitudinal continuation of the features well beyond the apparent edges in the Nord data, suggesting that the patches were produced nearly simultaneously over several hours of magnetic local time. Ionosonde, TEC, and scintillation data confirmed that the optical patches were associated with electron density enhancements and elevated levels of scintillation, although levels of structuring varied significantly from patch to patch.

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