CORONAL HOLES: NASA’s Solar Dynamics Observatory is monitoring a pair of coronal holes straddling the sun’s equator.

 They are the deep-blue wedges in this extreme ultraviolet image of the sun taken mid-day on April 9th:

Coronal holes are places in the sun’s atmosphere where the ambient magnetic field opens up and allows solar wind to escape. A double-stream of solar wind flowing from these coronal holes could reach Earth on April 12-14.

It is possible that neither stream will be geoeffective as they flow north and south of our planet. On the other hand, a “brush pass” might still spark polar auroras. NOAA forecasters estmate a 40% chance of polar geomagnetic storms when the streams arrive. Aurora alerts:textvoice

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