Here is this week’s space weather and geophysical report,...

Here is this week’s space weather and geophysical report, issued 2017 May 01 0108 UTC.

Highlights of Solar and Geomagnetic Activity 24 - 30 April 2017

Solar activity was at very low levels. The most significant event of the period was observed early on 30 April at 0057 UTC when Region 2653 (S09, L=031, class/area, Hax/110 on 23 Apr) produced a long-duration B3 flare with an associated slow-moving CME off the WSW limb, first visible in LASCO C2 imagery at 30/0336 UTC. Analysis and subsequent WSA-Enlil model output suggested a possible weak, glancing blow at Earth beginning late on 03 May.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached very high levels on 24-28 April and high levels on 29-30 April. A maximum flux of 66,472 pfu was observed at 26/1735 UTC.

Geomagnetic field activity was at quiet to active levels on 24-25 April under the waning influence of a negative polarity CH HSS. Predominately quiet levels were observed from 26-30 April.

Forecast of Solar and Geomagnetic Activity 01 May - 27 May 2017

Solar activity is expected to be very low with a slight chance for C-class flare activity throughout the outlook period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is likely to reach high levels on 01-02, 04-06, 17-20 and 24-27 May with very high levels likely on 21-23 May. Normal to moderate flux levels are expected for the remainder of the period.

Geomagnetic field activity is likely to reach G2 (Moderate) geomagnetic storm levels on 19-20 May with G1 (Minor) geomagnetic storm levels likely on 17-18 May due to the influence of multiple, recurrent CH HSSs. Active conditions are likely on 01, 16 and 21 May due to CH HSS influence with additional active conditions possible on 03-04 May due to CME effects. Quiet to unsettled levels are expected for the remainder of the period.

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