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Ringing event over USA

Tim Stone

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Yesterday, 15 February 2021 20:00 UT there was an interesting magnetic event. I recorded it on my magnetometer and my reading exactly matched USGS Boulder and USGS Fredericksburg readings. Coincident with an abrupt drop in the solar wind density, the magnetic field oscillated at relatively high frequency and amplitude for 15-30 minutes. I think I understand what happened. The sudden change solar wind pressure on the magnetic field caused it to rebound like a plucked string, ringing until it reached its new equilibrium. Am I thinking about this correctly?

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