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A successful experiment during the UK EISCAT campaign was undertaken in December 1998 in collaboration with MPI. The December campaign was to investigate the auroral absorption during E-region instability conditions. The comparison of the 2D images from IRIS and STARE (Scandinavian Twin Auroral Radar Experiment) observations during FB (Farley-Buneman) instability conditions indicated that the absorption of cosmic noise in the D-region is dramatically reduced during periods of strong electric field enhancements.

This appears to be due to the development of a strong ion-acoustic turbulence, over a very large band of wavelengths, perpendicular to the magnetic field, and a resultant screening of the penetration of both the precipitating particles and cosmic noise into the D-region. This anti-correlation of absorption with electric field has also been observed in our recent study of a CME (coronal mass ejection) event.

EISCAT measurement of electric field (red) and IRIS observation of ionospheric absorption (blue) as a function of time during the CME event on Jan. 10.1997, indicating the anti-correlation between absorption and the electric field.

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