Ground Pulsations Pc 4
Taken by Rob Stammes on October 20, 2015 @
Polarlightcenter Lofoten Norway.
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Details:
For lovers of natural made monochromatic amplitude modulated oscillations in the Pc4 range.A graph from one of my instruments this morning,october 20.2015.Visible a few times a year during guiet magnetic conditions.
Photographer's website:
http://polarlightcenter.com
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