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 2017-06-30:

PCAs typically last anywhere from about an hour to several days, averages around 24 to 36 hours. PCAs cause ionization of lower ionosphere at polar regions, results in heavy absorption of HF radio signals.

The absorption associated with PCA is measured by an instrument known as a riometer. PCA appears first over the polar regions, then expands equatorward to a magnetic latitude of approximately 65 degrees. PCA events cover the entire polar region down to about a geomagnetic latitude of 65 degrees.

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