Example plot:
STARE RTI plot from Norwegian radar at Dec 9, 2003.
(Click to get a larger version)

STARE RTI plots are Range - Time - Intensity plots. They are available for each of the two radars (Norway and Finland) separately. The plots show the amount of backscatter (colour scale, in dB) that a radar receives at a certain distance (scale on the left, in so-called "range gates") at a certain time (scale on the bottom).

Only when and where the radars receive backscatter, the ionospheric electric field can be determined.