Physics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979p%26ss...27..997s&link_type=abstract
Planetary and Space Science, vol. 27, July 1979, p. 997-1000.
Physics
5
Auroras, Geomagnetic Latitude, Magnetic Storms, Magnetospheric Instability, Polar Caps, Ring Currents, Geomagnetic Tail, Magnetic Flux, Polar Substorms
Scientific paper
It is observed that in the course of at least one major magnetic storm, during aurorally quiet pauses, the poleward limit of auroral activity is shifted 10-15 degrees equatorward of its typical non-storm-time limit. The storm-time ring current will contribute to the equatorward shift by expanding the size of the magnetosphere, causing an increase in the magnetic flux in the tail that maps into the aurorally inactive polar cap. A new model of the ring current is used to estimate the size of the ring current effect on the shift in the poleward limit. One calculated example that is probably representative gives a shift of between 5 and 10 degrees corresponding to a ring current index in the range from -300 to -600 nT.
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