Recurrent, positive polarity CH HSS sparks geomagnetic storming

Recurrent, positive polarity CH HSS sparks geomagnetic storming

Our planet is again under the influence of a recurring, positive polarity Coronal Hole High Speed Stream (CH HSS), which is causing isolated periods of G1 - Minor geomagnetic storming.

Over the past 24 hours, solar wind parameters were indicative of the arrival of a Co-Rotating Interaction Region (CIR) and an onset of a recurrent, positive polarity CH HSS. Total field strength increased to 14 and 15 nT with CIR arrival, before decreasing to around 6 nT around 12:30 UTC today. The Bz component was variable, while the solar wind speed increased from 375 km/s to over 610 km/s. Solar wind is expected to remain enhanced over the next three days due to CH HSS effects.

The geomagnetic field is expected to be at active to G1 - Minor storm levels, with an isolated period of G2 - Moderate storming likely today. Primarily unsettled to active conditions, with periods of G1 storming likely as CH HSS influences continue are expected on October 26. A decrease to unsettled to active levels are expected on October 27 as CH HSS effects begin to wane.

SWX overview October 25, 2017

Meanwhile, solar activity is very low with no flares on the visible disk in the past 24 hours. There are two numbered active regions on the Earth side of the Sun but both of them are inactive.

CH&AR map for October 24, 2017

Solar activity is expected to remain at very low levels over the next three days, with a slight chance for C-class flares.

Featured image: Taken by Markus Varik on October 23, 2017 @ Tromsø, Norway. (Via SpaceWeather)

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Tags: g1 storm

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