(Sudden Frequency Deviation), SCNA (Sudden Cosmic Noise Absorption), SEA (Sudden Enhancement of Atmospherics), etc. See also Ionospheric storm Space weather References External links AAVSO SID Monitoring Program Further information on SID monitoring Space Weather Monitors- Stanford SOLAR Center Amateur SID monitoring station SID monitoring using Spectrum Lab NASA - Carrington Super Flare NASA May 6, 2008 Ionosphere Planetary science Radio frequency propagation Space science Space weather