Welcome to Real-Time Ionospheric Perturbation Monitoring Data Page!
The Real-time Ionospheric Perturbation Monitoring will soon be upgraded to use multiple constellations (GPS, GLONASS, Galileo, and QZSS).
A test product with the multi-constellation GNSS is available here.

Real-time dTEC monitoring
Saito, S., Yoshihara, T., and Yamamoto, M., Real time iono- spheric disturbance analysis and monitoring with GEONET real time data. Proc. of the 2014 International Technical Meeting of the Institute of Navigation (ION ITM 2014), San Diego, CA, 720-724, https://www.ion.org/publications/abstract.cfm?articleID=11544, 2014.
Real-time ROTI monitoring
Saito, S., Hosokawa, K., Sakai, J., and Tomozawa, I., Study of structures of the sporadic E layer by using dense GNSS network observations, NAVIGATION: Journal of The Institute of Navigation, Vol. 68, 751-758, doi:10.1002/navi.454, 2021.
This work was supported by the JSPS Grant-in-Aid for Scientific Research JP24340120 and JP18H04437. This work was partly supported by Murata Foundation.
*The Real-Time Ionospheric Perturbation Analysis is based on the proprietary data obtained from GEONET (GNSS Earth Observation Network System) operated by Geospatial Information Authority of Japan.