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Geomagnetic storms for 27 hours....
As reported by SpaceWeather, the storms were caused by a co-rotating interaction region (CIR):
A 24-HOUR GEOMAGNETIC STORM: A co-rotating interaction region (CIR) hit Earth on May 29th, sparking 24 hours of non-stop geomagnetic storming. The day started off strong (G3) before settling into a sustained stretch of minor to moderate disturbances.
CIRs
are transition zones between fast- and slow-moving streams of solar
wind. They're like mini-CMEs. They contain shock waves and enhanced
magnetic fields that do a good job sparking geomagnetic storms and
auroras.
