Further direct comparisons of incoherent scatter and medium frequency radar winds from AIDA '89

摘要

Menopause level winds measured over Arecibo (18°N, 67°W) for the interval 1200-1416'h 10 April 1989 by the incoherent scatter (ISR) and the MAPSTAR MF radars during AIDA '89 are compared. Imaging Doppler interferometry (IDI), full correlation and three dimensional interferometry analyses have been applied to the MAPSTAR radar data. To determine the measure of agreement at time scales less than the two hour integration intervals previously employed for published AIDA data, the overall interval was split found into four 34 min segments, and each analyzed individually. The agreement at the shorter timescales was found to be as good as that for the 2 h interval with, as has been noted previously, the zonal component agreement being better than that for the meridional. The IDI and Full Correlation Analysis (FCA) apparent velocities are in better agreement with the ISR winds than is the FCA true velocity. Sky maps of the distribution of IDI measured scattering point velocities are what one would expect if these represent actual line of sight wind velocities. We have looked at scattering point distributions, and find no evidence in our data for the scattering point alignment predicted by the volume scattering hypothesis.