Abstract
Measurements carried out with the SOUSY radar system to the south-east of a jet stream during a night in November 1981 are described. Particular attention is paid to the association between power and spectral width of echoes returned from the vicinity of the tropopause located near 12 km. A negative association is found between power and spectral width of echoes from 150 m height channels between 10.65 km and 11.70 km, both with the radar beam directed vertically and at 7° to the vertical in the northerly and easterly directions. Evidence for a positive association is only found for height channels centred at 11.85 and 12.15 km and then chiefly with the beam directed vertically. A partial correlation analysis suggests that the possible influences of the finite beamwidth of the radar system and of wind shear on the spectral width do not affect the associations found. The results are discussed in terms of the scattering and partial reflection mechanisms giving rise to the echoes.
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