Observation of a thin Es-layer by the EISCAT radar

Details Observation of a thin Es-layer by the EISCAT radar Observation of a thin Es-layer by the EISCAT radar

Dec 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33.1407t&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 33, Dec. 1985, p. 1407-1416.

Computer Science

17

Auroral Arcs, Eiscat Radar System (Europe), Radar Tracking, Sporadic E Layer, Incoherent Scatter Radar

Scientific paper

High resolution E-region measurements carried out on Nov. 16, 1983, using the EISCAT incoherent scatter radar are presented. The experiment was monostatic with a vertical radar beam, and it was based on a Barker-coded four-pulse code on one frequency channel and Barker-coded single pulses on three channels. The basic integration time was 15 s and the spatial resolution 450 m. The results reveals a short-lived but intense thin sporadic E-layer at 18:00-18:06 U.T. at an altitude of about 106 km. Both before and during the event, downward ion velocities of the order of 100 m/s are observed above this height. A convergent null in the vertical ion speed is occasionally seen at the layer altitude. The layer occurrence is associated with auroral arcs drifting across the radar beam. Simultaneous observations of the STARE radar show an ionospheric electric field of 25-30 mV/m. The field always has a westward component, which is in accordance with the observed downward plasma flow. Most of the time when the layer is intense, the field points into the NW-sector. Theoretically, this field direction should create convergent vertical plasma motion. Therefore it is suggested that the observed Es layer is created by the action of the auroral electric field rather than by the wind shear mechanism.

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