Boundary layer plasmas as a source for high-latitude, early afternoon, auroral arcs

Details Boundary layer plasmas as a source for high-latitude, early afternoon, auroral arcs Boundary layer plasmas as a source for high-latitude, early afternoon, auroral arcs

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1389l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Dec. 1985, p. 1389-1406.

Computer Science

44

Auroral Arcs, Boundary Layer Plasmas, Noon, Plasma Diagnostics, Satellite Observation, Field Aligned Currents, Magnetosheath, Noaa Satellites, Polar Regions, Prognoz Satellites, Tiros Satellites

Scientific paper

Simultaneous measurements of hot boundary layer plasma from Prognoz-7 and particle precipitation from the TIROS/NOAA satellite in nearly magnetically conjugate regions have been used to study the dynamo process responsible for the formation of high latitude, early afternoon, auroral arcs. Characteristic for the Prognoz-7 observations in the dayside boundary layer at high latitudes is the frequent occurrence of regions with injected magnetosheath plasma embedded in a 'halo' of antisunward flowing magnetosphere plasma. The injected magnetosheath plasma have several features which indicate that it also acts as a local source of EMF in the boundary layer. The process resembles that of a local MHD dynamo driven by the excess drift velocity of the injected magnetosheath plasma relative to the background magnetospheric plasma. The dynamo region is capable of driving field-aligned currents that couple to the ionsphere, where the upward current is associated with the high altitude auroral arcs. It is demonstrated the large-scale morphology as well as the detailed data intercomparison between Prognoz-7 and TIROS-N both agree well with a local injection of magnetosheath plasma into the dayside boundary layer as the main dynamo process powering the high-latitude, early afternoon, auroral arcs.

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