| Grey Line Map |
The grey line is a band around the Earth that separates daylight from darkness. Propagation along the grey line is very efficient. One major reason for this is that the D layer, which absorbs HF signals, disappears rapidly on the sunset side of the grey line, and it has not yet built upon the sunrise side.
This map will automatically refresh every 5 minutes.
Click here to show a dynamically updating Grey Line map
Near-Real-Time MUF map
The following map shows Maximum Usable Frequencies (MUFs) for 3000 kilometer radio signal paths. More importantly, the current sunspot number (SSN) and Planetary A-index are updated every 30 minutes on the bottom of this image. Additionally, the grey line position, auroral ovals, and sun position are provided. Click on the map for more details on how to use it.
This image courtesy of Solar Terrestrial Dispatch
Layout and dynamic reports created by N6RT
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