A uniform belt of diffuse auroral emission seen by the ISIS-2 scanning photometer

Details A uniform belt of diffuse auroral emission seen by the ISIS-2 scanning photometer A uniform belt of diffuse auroral emission seen by the ISIS-2 scanning photometer

May 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21..799l&link_type=abstract

Planetary and Space Science, Volume 21, Issue 5, p. 799-799.

Physics

17

Scientific paper

One of the most striking and persistent features in high latitude regions as seen by the ISIS-2 scanning auroral photometer is a fairly uniform belt of diffuse auroral emission extending along the auroral oval. Indications are that this region follows, contributes to, and may in a sense actually define the auroral oval during quiet times. The diffuse belt is sharply defined at its equatorward edge, which is located at an invariant latitude of about 65° in the midnight sector during relatively low magnetic activity (Kp = 1-3). The poleward edge of the region is not as sharply defined but is typically at about 68°. Discrete auroras (arcs and bands) are located, in general, near the poleward boundary of the diffuse aurora. The position of the belt appears to be relatively unaffected by the occurrence of individual substorms, even when discrete forms have moved well poleward. Representative intensities at 5577 Å are 1-2 kR (corrected for albedo) at quiet times and may reach 5 kR during an auroral substorm. It appears that the mantle aurora and proton aurora constitute this diffuse aurora in the midnight sector. Precipitating protons and electrons both contribute to the emissions in this region.

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