Posted by James Watson on 25 Aug, 2016
The National Oceanic and Atmospheric Administration (NOAA) produce geophysical alerts providing information about the current conditions for long distance HF radio communications (NOAA). The bulletins are updated every 3 hours and take the following form;
:Product: Geophysical Alert Message wwv.txt :Issued: 2016 Aug 24 1505 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # # Geophysical Alert Message # Solar-terrestrial indices for 23 August follow. Solar flux 81 and estimated planetary A-index 18. The estimated planetary K-index at 1500 UTC on 24 August was 4. Space weather for the past 24 hours has been minor. Geomagnetic storms reaching the G1 level occurred. Space weather for the next 24 hours is predicted to be minor. Geomagnetic storms reaching the G1 level are likely.
A banner is now displayed on the P2P, Area and Surface pages warning of predicted activity at level 2 and above; G2 (HF radio propagation can fade at higher latitudes), S2 (Small effects on HF propagation through the polar regions and navigation at polar cap locations possibly affected) and R2 (Limited blackout of HF radio communication on sunlit side).
None of these parameters are used by proppy but warnings of impending unusual solar activity maybe of interest to users performing predictions for immediate use.