Ionospheric activity forecast tool


With increased ionospheric activity from Solar Cycle 25, it can be challenging to determine if your GNSS tracking and positioning is being impacted by the ionosphere or other interference sources.

Elevated TEC (total electron count) values and in particular high rates of change in TEC are indicative of scintillation conditions, meaning possible impact to GNSS positioning accuracy and availability. TEC is the number of electrons along the signal path between a satellite and a receiver. It can fluctuate daily as the sun excites regions of the ionosphere. TEC also has a seasonal variation and is influenced by solar and geomagnetic conditions. This causes the values to differ by latitude, longitude, season or solar cycles which is why we see variations in ionospheric scintillation impacts depending on geography and time of year.

The below map displays TEC values from the past seven days and forecasts TEC values for the next 72 hours.

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The TEC data was obtained through the online archives of the Crustal Dynamics Data Information System (CDDIS), NASA Goddard Space Flight Center, Greenbelt, MD, USA.