Ge. Bond et al., SPATIAL OBSERVATIONS BY THE CUTLASS COHERENT SCATTER RADAR OF IONOSPHERIC MODIFICATION BY HIGH-POWER RADIO-WAVES, Annales geophysicae, 15(11), 1997, pp. 1412-1421
Results are presented from an experimental campaign in April 1996, in
which the new CUTLASS (Co-operative UK twin-located Auroral Sounding S
ystem) coherent scatter radar was employed to observe artificial field
aligned irregularities (FAI) generated by the EISCAT (European Incohe
rent SCATter) heating facility at Tromso, Norway. The distribution of
backscatter intensity from within the heated region has been investiga
ted both in azimuth and range with the Finland component of CUTLASS, a
nd the first observations of artificial irregularities by the Iceland
radar are also presented. The heated region has been measured to exten
d over a horizontal distance of 170 +/- 50 km, which by comparison wit
h a model of the healer beam pattern corresponds to a threshold electr
ic field for FAT of between 0.1 and 0.01 V/m. Differences between fiel
d-aligned and vertical propagation heating are also presented.