Updates: Every 10 minutes
This map is derived from SWS 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 sight 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 effects. 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 SWS ISM network.
SWS provides a free email alert for adverse Ionospheric Scintillation conditions observed in the ISM network. To subscribe, please visit the Ionospheric Scintillation alert page.
In addition to the above map produced using the SWS ISM network, we also produce a wider regional map using 1 second sampled GPS total electron content (TEC) data. This is a less robust measure of scintillation, however this map has a much broader coverage. The lastest map is shown below. To browse all available maps and for more information visit the GPS derived scintillation map page, or click the image below.
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 SWS.