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NVIS WORLD MAP
NVIS Optimum  HF Frequencies (foF2):
For communications within 300 kilometers - To use the map, locate the map for your location and click on it.  The color (frequency) at your location is the optimum frequency for F2 layer NVIS communication. Updated at 40 minutes past the hour; Click on the maps to zoom and reload.
These maps are made from data gathered in real time around the world using HF ionospheric radar systems called ionosondes. Ionosondes bounce HF radio signals off the ionosphere to measure the height of the reflective zones and signal strength vs frequency. The maps are generated using the ionosonde data to make projections based upon a base station working a mobile.
Mapping source: Australian Government IPS Radio and Space Services
Wide Region Optimum HF Frequencies for Distant Communications, Centered on World Cities
To use these longer distance maps below, locate a map for the city nearest your location and click on it.  Locate the distant point on the map for communication with.  The color at that distant location point determines the best frequency to use. Updated at 40 minutes past the hour; Click on the maps to zoom and reload.
San Francisco
Click: San Francisco Zoom
Boulder
Boulder Zoom
Kansas City
Kansas City Zoom
Washington DC
Washington DC Zoom
Whitehorse
Whitehorse Zoom
Montreal
Montreal Zoom
London
London Zoom
Rome
Rome Zoom
Stockholm
Stockholm Zoom
Tokyo
Tokyo Zoom
Sydney
Sydney Zoom
Darwin
Darwin Zoom
Perth
Perth Zooom
Auckland
Auckland Zoom
Australia/NZ regional maps frequency color bar

These maps are made from data gathered in real time around the world using HF ionospheric radar systems called ionosondes. Ionosondes bounce HF radio signals off the ionosphere to measure the height of the reflective zones and signal strength vs frequency. The maps are generated using the ionosonde data to make projections based upon a base station communicating with a mobile. Mapping source: Australian Government IPS Radio and Space Services

GOES Xray Flux
These plots are updated every five minutes using X-ray information supplied by the US Space Environment Center. A plot of solar X-ray flux for the last three days is provided in Today's Space Weather by Space Environment Center in Boulder.


Solar Cycle Sunspot Progression

"We've got a lot riding on our solar cycle."









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HFLINK is the international resource for ALE Automatic Link Establishment High Frequency Communications, HF Digital Messaging, Emergency / Disaster Relief, Interoperative HF Communications, HF Network, Ham Radio.