Here is an example of a 512 second integration combined from all of the 30 beams intersecting the Tromsø VHF beam at different altitudes. With this experiment that has a 128 microsecond baud length, we can reach altitudes up to 400 km.
|(Click image to enlarge)|
The plots are fairly similar with monostatic VHF spectra, although there are still lots of challenges with absolute calibration of electron density. These issues can hopefully be solved by comparison with monostatic Tromsø measurements, or with future plasma line measurements with KAIRA.