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

Here is this week’s space weather and geophysical report, issued 2017 Jul 31 0238 UTC.

Highlights of Solar and Geomagnetic Activity 24 - 30 July 2017

Solar activity was very low throughout the summary period. A B1 flare, observed at 27/2136 UTC from a plage region near center disk, was the strongest event of the period. Region 2668 (N03, L=311, class/area Axx/010 on 25 Jul) decayed to plage by 26 Jul and Region 2669 (N18, L=255, class/area Axx/010 on 30 Jul) remained inactive. No Earth-directed CMEs were observed in available coronagraph imagery.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at normal to high levels on 26 Jul, high levels on 30 Jul and moderate to high levels throughout the remaining days of the period. A maximum flux of 18,800 pfu was observed at 25/1515 UTC. The enhancements in flux levels were due to persistently elevated solar winds from a slowly-waning, positive polarity CH HSS.

Geomagnetic field activity ranged from quiet to active levels over the past week. Quiet to active levels were observed on 24 Jul and 26 July; quiet to unsettled levels were observed on 25 Jul and 27-28 Jul; the remaining days were quiet. Geomagnetic activity was associated with the influence of a slowly-waning, positive polarity CH HSS enhancing solar wind speeds. A steady decline in wind speed was observed over the entire reporting period from a peak speed of 705 km/s at 24/2219 UTC to a low of around 350 km/s by the end of 30 Jul.

Forecast of Solar and Geomagnetic Activity 31 July - 26 August 2017

Solar activity is expected to be at low levels with a chance for M-class flare (R1-R2/Minor-Moderate) on 31 Jul - 13 Aug due to the return of old Region 2665 (S06, L=113) rotating across the visible disk. The remainder of the outlook period is expected to be at very low levels.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to range from normal background to high levels. High levels are expected on 01-03 Aug, 05-10 Aug, and 18-26 Aug; moderate levels are expected 31 Jul and 11 Aug; normal background levels are expected for 04 Aug and 12-17 Aug. All enhancements in electron flux are due to multiple anticipated recurrent CH HSSs.

Geomagnetic field activity is expected to range from quiet to G1 (Minor) geomagnetic storm levels. G1 (Minor) storm levels are likely on 04-05 Aug and again on 17-18 Aug; active conditions are likely on 31 Jul, 06 Aug and 19 Aug; unsettled levels are likely on 01-02 Aug, 07 Aug and 20-21 Aug; quiet conditions are expected for the remaining days of the outlook period. All anticipated enhancements in geomagnetic activity are due to multiple, recurrent CH HSSs.

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