It's a measure of solar activity upon our atomosphere. 7 indicates a relatively high level of activity (storm) which can affect High and Medium Frequency Band (2-30MHz) communications. A bad enough event as Coronal Mass ejection will cause NASA to warn ISS crews to seek shelter in protected areas of the space station and can even effect other forms of communications on earth.
http://www.swpc.noaa.gov/info/Kindex.html
73,
kevin
kc6pob
From: Joann Lavis <joalis76@hotmail.com>
To: kim california disasters <californiadisasters@yahoogroups.com>
Sent: Friday, June 28, 2013 10:58 PM
Subject: RE: [californiadisasters] Jet Stream Blamed For Weather Extremes
can anyone tell me what this means, - WARNING: Geomagnetic K-index of 7/greater expected From: Jun 29 0515 UTC To: Jun 29 1000 Onset NOAA Scale: G3 or greater-Strong to Extreme saw this on calfirenewsblog
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