12/07/13 03:37:34.00 AO01aeVnO
しかし英文のメールはインパクトあるよね。
SWPC X-ray alerts are issued at the M5 (5x10E-5 Watts/m2) and X1
(1x10E-4 Watts/m2) levels, based upon 1-minute data. Large X-ray bursts cause short
wave fades for HF propagation paths through the sunlit hemisphere.
Some large flares are accompanied by strong solar radio bursts
that may interfere with satellite downlinks.
This page updates dynamically every 5 minutes.
NOAA / Space Weather Prediction Center