Beacon TEC Data
IMPC provides TEC measurements from Radio Beacons. In IMPC coherent radio waves at 150 and 400 MHz transmitted by several satellites of LEO-systems are monitored with local Beacon receivers.
There are several satellites of LEO-systems transmitting radion beacon signals such as:
- NIMS (Navy Ionospheric Monitoring Systems)
When computing the differential phase of both signals, the relative, i.e. uncalibrated TEC may be derived. While measuring the signal strength, the scintillation index S4, a measure of signal strength fluctuations, is also estimated.
The following local Beacon receivers deliver data to IMPC: