Earth is under the influence of a recurrent, positive polarity coronal hole high speed stream (CH HSS). A G1 - Minor geomagnetic storm began at 05:59 UTC today.
Solar wind parameters, as measured by the DSCOVR spacecraft, continued at mostly nominal levels over the past 24 hours. Solar wind velocities averaged near 320 km/s, before increasing to near 350 km/s by 00:30 UTC today. Total field (Bt) was steady near 5 nT, before increasing to a peak of 12 nT, while the Bz component reached a low value of -11 nT. Phi angle was mostly positive, with occasional oscillations into the negative sector near the end of the period.
SWPC forecasters expect solar wind parameters to remain enhanced through April 20. A return to near ambient conditions is anticipated on April 21.
A G1-Minor geomagnetic threshold was reached at 05:59 UTC on April 19, 2017. The elevated conditions are a reflection of enhanced solar wind parameters from the influence of a positive polarity coronal hole high speed stream.
Solar wind parameters, as measured by the DSCOVR spacecraft, continued at mostly nominal levels over the past 24 hours. Solar wind velocities averaged near 320 km/s, before increasing to near 350 km/s by 00:30 UTC today. Total field (Bt) was steady near 5 nT, before increasing to a peak of 12 nT, while the Bz component reached a low value of -11 nT. Phi angle was mostly positive, with occasional oscillations into the negative sector near the end of the period.
SWPC forecasters expect solar wind parameters to remain enhanced through April 20. A return to near ambient conditions is anticipated on April 21.
A G1-Minor geomagnetic threshold was reached at 05:59 UTC on April 19, 2017. The elevated conditions are a reflection of enhanced solar wind parameters from the influence of a positive polarity coronal hole high speed stream.
Meanwhile, two C-class solar flares erupted from newly numbered Region 2651 (beta-gamma). One of them was a long-duration C5 flare which started at 19:21 UTC. The event had a Type II (estimated velocity 631 km/s) and IV radio emissions associated, suggesting a CME was produced. Since the region is currently located on the Sun's eastern limb, it does not seem likely this CME will have an Earth-directed component.
However, it is possible these flares signal the return of AR 2644 which unleashed 7 M-class solar flares during its previous rotation. A sharp uptick in solar activity is possible in the days ahead.
https://watchers.news/2017/04/19/geomagnetic-storms-reaching-g1-level-expected/
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