N. Aponte et al., MEASURING IONOSPHERIC DENSITIES, TEMPERATURES, AND DRIFT VELOCITIES SIMULTANEOUSLY AT JICAMARCA, Geophysical research letters, 24(22), 1997, pp. 2941-2944
Incoherent scatter autocorrelation function measurements are difficult
to make in the F region at Jicamarca because of very strong clutter c
ontamination by coherent echoes from unstable plasma waves in the E-re
gion electrojet that are aligned with the magnetic field. We have deve
loped a more effective way to deal with this clutter that improves the
quality of the temperature (and composition when light ions are prese
nt) data. Other coherent echoes (much weaker than electrojet echoes bu
t stronger than incoherent scatter) are also received through the ante
nna sidelobes from field-aligned irregularities in the 140-170 km alti
tude range during daytime. These latter echoes have a very narrow band
width, and so it is easy to measure their Doppler shift and obtain the
vertical plasma drift velocity, which is proportional to the zonal el
ectric field.