Plasma instabilities in the lower E-region observed during the DYANA campaign

Details Plasma instabilities in the lower E-region observed during the DYANA campaign Plasma instabilities in the lower E-region observed during the DYANA campaign

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56.1853b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 13-14, p. 1,853-1,870

Computer Science

Sound

7

E Region, Electric Fields, Electron Energy, Magnetohydrodynamic Stability, Mesosphere, Plasma Waves, Thermosphere, Wave Propagation, Magnetic Fields, Meteorological Radar, Sounding Rockets, Winter

Scientific paper

During the DYnamics Adapted Network for the Atmosphere (DYANA) campaign a number of instrument sounding rockets were launched from Andoya Rocket Range (ARR) in Norway (69 deg N) to study the dynamics of the mesosphere and lower thermosphere during winter conditions. The EISCAT UHF radar in Tromso, located 130 km to the east of ARR, was used to map the electric field and the wind field in the same heigh region. During some of the launches, plasma irregularities with scales in the range from a few meters to tens of meters were observed. We focus our attention on an event which took place on 8/9 March 1990. Two instrumented payloads code-named DAT-73 and DAT-76 were flown 92 min apart during different levels of disturbance in the E-region. We have studied the plasma fluctuations observed during these flights in terms of the modified two-stream gradient-drift instabilities using linear fluid theory. The observed height extent of the disturbed region is in excellent agreement with theoretical predictions based upon measurements of background plasma parameters. We also find that the instability is much stronger during the first part of the event as a consequence of larger drift velocities. This is evident by the large plasma fluctuations measured in situ as well as the electron density gradients and recombinational damping. During the flight of DAT-73, the plasma waves must propagate in a direction different from 90 deg with respect to the magnetic field, while the DAT-76 observations can be explained by plasma waves propagating normal to the magnetic field.

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