Coronal hole stream onset, G1 geomagnetic storm

Wednesday, 15 April 2015 18:10 UTC

Coronal hole stream onset, G1 geomagnetic storm

Auroral activity has reached the minor G1 geomagnetic storm threshold during the past 24 hours thanks to a coronal hole high speed solar wind stream. The direction of the IMF (Bz) is pointing southward most of the time and this is causing enhanced auroral displays at high latitude locations. Auroral displays have been visible from many locations all over the world and in the northern hemisphere it was even seen as far south as Norfolk, England (!) where James Rowley-Hill took this amazing image that serves as our header. Fantastic!

Below you can find more stunning auroral images captured around the world during the past 24 hours:

Nathalie Åkerlind (Torstuna, Uppsala Län, Sweden)

Jüri Voit Photography (Estonia)

Jörgen Norrland Andersson (Gävleborgs Län, Sweden)

Sophie Fazackerley‎ (Howden, Tasmania, Australia)

Isaac Diener‎ (Painesdale, MI, USA)

The speed of the solar wind has now increased to over 600km/s but the strength of the IMF has diminished along with the solar wind density. These are classic signs of a solar wind stream flowing from a coronal hole. More periods of active (Kp4) to minor G1 geomagnetic storming (Kp5) conditions remain capable in the hours ahead. High latitude sky watchers need to remain alert for possible auroral displays.

Any mentioned solar flare in this article has a scaling factor applied by the Space Weather Prediction Center (SWPC), the reported solar flares are 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.

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