The Elastic Field

Not much to do these windy days, other than run some WSPR on 14MHz.

Once again, the usefulness of low power WSPR to detect a minor disturbance to the geomagnetic field became evident.

This time, world-class station, OE9GHV, heard my 200mW in the post-midnight period, as the field went from a minor disturbance and restored to quiet conditions.  The same occurred with DK6UG.

In previous days, where the field was essentially quiet, no such post-midnight propagation is seen:

Image: Tromso Geophysical Laboratory.

OE9GHV receiving MW1CFN, 200mW 14MHz WSPR.  M=midnight.  Extended horizontal lines indicate no propagation.

DK6UG reception, showing the same phenomenon.