Organización Europea de Radioaficionados

3.00

4

LINISTIT

137

:Product: Geophysical Alert Message wwv.txt :Issued: 2026 Jul 21 1820 UTC # Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center # # Geophysical Alert Message # Solar-terrestrial indices for 20 July follow. Solar flux 137 and estimated planetary A-index 4. The estimated planetary K-index at 1800 UTC on 21 July was 3.00. Space weather for the past 24 hours has been minor. Radio blackouts reaching the R1 level occurred. Space weather for the next 24 hours is predicted to be minor. Geomagnetic storms reaching the G1 level are likely. Radio blackouts reaching the R1 level are likely. ...