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Last week, a massive hole in the Sun’s atmosphere led to a severe geomagnetic storm that put satellites on high alert and delivered Northern Lights down to very low latitudes. And now there is another one. Forecasting expects another increase in solar wind to arrive towards the end of the week, providing another chance for spotting these magnificent aurorae.
The coronal hole is a region in the Sun’s corona – its outer atmosphere – which is cooler than the rest due to open unipolar magnetic fields. The magnetic fields are what allow the solar wind – the stream of charged particles escaping the Sun – to move away more freely and hence more quickly. And this might lead to an increase in geomagnetic activity.
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