Useful sources of information about radio wave propagation
Space weather — current conditions on the Sun and around and on Earth.
Solar wind, flares, sunspots, K- and A-indices, interplanetary magnetic field, geomagnetic storms, forecasts, and more.
http://spaceweather.com/
Current auroral activity:
http://www.sec.noaa.gov/pmap/pmapN.html
Auroral activity forecast:
http://www.gedds.alaska.edu/AuroraForecast/
Current solar images:
http://umbra.nascom.nasa.gov/images/
Current SOHO coronal image:
http://sohowww.nascom.nasa.gov/data/realtime/c3/512/latest.gif
Space Weather Now (NWS/NOAA):
http://www.sec.noaa.gov/SWN/
Real-time 6m/2m/70cm paths:
http://www.vhfdx.net/spots/map.php
Real-time 50 MHz paths:
http://maps.dxers.info/tec/6m_tec.php
There is a 4-D ionosphere exploration tool used in conjunction with Google Earth:
— NASA Science News story about the tool
— The visualization tool
Propfire Firefox plugin: http://www.n0hr.com/Propfire.htm
Many
resources on one (large!) page:
http://www.telefonica.net/web2/ismael/REMER/HF/panelhf.htm
Loads of current propagation info:
http://hfradio.org/propagation.html
Even more:
http://dx.qsl.net/propagation/
Loads of DX spots:
http://oh2aq.kolumbus.com/dxs/
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