Large-scale high-latitude dayside auroral emissions

Details Large-scale high-latitude dayside auroral emissions Large-scale high-latitude dayside auroral emissions

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.2345m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, March 1, 1990, p. 2345-2354. Research supported by NSERC.

Physics

36

Auroras, Dayglow, Geomagnetic Tail, Interplanetary Magnetic Fields, Ultraviolet Radiation, Flux Transfer Events, Kelvin-Helmholtz Instability, Magnetosheath, Polar Regions, Temporal Distribution

Scientific paper

Observations made with the Viking UV imager reveal that on the dayside of the auroral distribution there often occur emission features poleward of the normal continuous auroral distribution when the IMF is northward and in an away garden hose configuration. The position of these features, the strong IMF dependence, and the observation that large-scale polar arcs are seen to frequently connect to these dayside features suggest that these auroral emission features are the result of processes occurring on the front surface of the magnetotail. This is consistent with the discovery that these features seem to exist predominantly when the IMF B(y) component is positive, B(x) negative, and B(z) is northward, which implies that merging on the front surface of the magnetotail is involved in producing these emissions. Evidence is presented which distinctly links the location of merging lines due to dipole tilt and magnetic activity with the location of this high-latitude dayside features.

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