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Space Weather Alert - 1st September 2023

What Has Happened?

LASCO CORONAGRAPH showing the CME from 1st September 2023. Imagery provided by NASA and ESA.


A partial-halo coronal mass ejection (CME) lifted from the Sun at approximately 04:00 UT on 1st September. This fast-moving CME is expected to arrive late on 2nd or early on 3rd September. An earlier CME from 30th August may produce a glancing blow on 2nd September. The combination of these CMEs is likely to enhance geomagnetic activity with significant STORM periods anticipated, following their arrival.

Assuming clear, dark skies, there is a greater chance of seeing the aurora on the 2nd and 3rd of September. Those in Scotland, northern England and Northern Ireland have a better chance if the weather is favourable on those nights.


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The British Geological Survey is a geoscience research centre that is part of UK Research and Innovation (UKRI) and affiliated to the Natural Environment Research Council (NERC).

CME or Coronal Mass Ejection
The eruption of a portion of the outer atmosphere of the Sun into space, caused by rapid changes in its magnetic field. Often occurs along with a solar flare.