Did you know? Here’s a space weather and radio...

Did you know? Here’s a space weather and radio propagation educational tidbit – from http://SunSpotWatch.com – at 14:00 UTC on 2017-04-10:

A geomagnetic storm is defined by changes in the “Dst” (or, “DST”), which stands for the “Disturbance, storm time” index. A geomagnetic storm has three phases: an initial phase, a main phase and a recovery phase.

Geomagnetic storm initial phase: The Dst increasing by 20 to 50 nT in tens of minutes. A geomagnetic-storm initial phase is also referred to as a storm sudden commencement (SSC).

Not all geomagnetic storms have an initial phase; nor all sudden increases in Dst are followed by a storm.

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