Weak CME passage, coronal hole

Wednesday, 9 November 2016 - 09:43 UTC

Weak CME passage, coronal hole

A weak shock passage was detected by DSCOVR around 05:43 UTC this morning. This is likely the filament coronal mass ejection from 5 November that is now passing our planet. As expected by us, it is only a minor glancing blow and geomagnetic storming is not expected at this time. Kp values up to 4 are possible with the current conditions.

Coronal hole faces Earth

Okay so the coronal mass ejection isn't all too much to get excited about as it is now. Good thing we have more news for you today. Indeed, we have yet again a large coronal hole facing our planet. Its the large southern hemisphere polar coronal hole that extends way north up to the solar equator. Our automated coronal hole detection system did its job and notified us this morning:

During the previous rotation, the solar wind stream from this exact same coronal hole managed to bring us up to minor G1 geomagnetic storm conditions and there is no reason to believe that we couldn't reach the G1 threshold again during this rotation. In fact, during the last rotation this coronal hole solar wind stream came in right behind a strong coronal mass ejection and we only really felt the high speed stream and never saw a co-rotating interactive region at our planet. These CIRs are slower, denser solar wind structures ahead of the high-speed stream with stronger IMF values and often cause a stronger geomagnetic response than the high-speed solar wind stream itself. So yeah, it wouldn't surprise us if we see an even stronger geomagnetic response than last time. Moderate G2 geomagnetic storm conditions are not entirely impossible. We should start to see the effects of this coronal hole solar wind stream at Earth either late on Friday (11 November) or early on Saturday, 12 November.

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Current data suggest that it is not possible to see aurora now at middle latitudes
The solar wind speed is currently moderately high (522 km/sec.)

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