This map is derived from IPS Ionospheric Scintillation Monitor (ISM) sites in Darwin and Weipa. Scintillation data from each GPS satellite traced is mapped to the approximate location at which the line of site pierces the ionosphere. The colours show the 80% percentile of the S4 index over 15 minute intervals and the size of the plot marker indicates the age of the data, with the most recent data shown with larger dots.

Scintillation above an S4 index of around 0.3 may begin to interfere with satellite communication and navigation and values above 0.6 may have severe efffects. For more information, please visit the About Ionospheric Scintillation page. See also the ISM plots page for more detailed presentation of ISM data over the last 24 hours from the IPS ISM network.

Ionospheric scintillation products and services are under ongoing development, and your feedback is valuable to us. If you are experiencing problems with ionospheric scintillation in GPS receivers or satellite communications equipment, or have a suggestion on ways we may improve our scintillation-related services, please contact IPS.