Observed connections between apparent polar cap features and the instantaneous diffuse auroral oval

Details Observed connections between apparent polar cap features and the instantaneous diffuse auroral oval Observed connections between apparent polar cap features and the instantaneous diffuse auroral oval

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981p%26ss...29.1143m&link_type=abstract

Planetary and Space Science, vol. 29, Nov. 1981, p. 1143-1147, 1149. Natural Sciences and Engineering Research Council of Canad

Physics

26

Auroral Arcs, Diffuse Radiation, Interplanetary Magnetic Fields, Night Sky, Polar Caps, Satellite Observation, Convective Flow, Coordinate Transformations, Earth Ionosphere, Earth Magnetosphere

Scientific paper

Images of the instantaneous nightside auroral distribution reveal that at times the orientation of auroral oval arcs changes to become characteristic of polar cap arcs. These connecting arcs all terminate in the diffuse aurora in the midnight sector, and their separation from the equatorward boundary of the diffuse aurora generally increases away from the midnight termination. The occurrence of these features requires a northward interplanetary magnetic field (positive B(z)) as well as low magnetic activity. The existence of connecting arcs and the observation that they are at times the poleward boundary of weak diffuse emission indicate that the poleward boundary of auroral emissions can be significantly modified during non-substorm periods. Such a distortion implies that there can be a modification of the standard convection pattern in the magnetosphere during periods of positive B(z) to produce expanded regions of sunward convection in the high latitude ionosphere.

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