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

Here is this week’s space weather and geophysical report, issued 2017 Aug 07 0315 UTC.

Highlights of Solar and Geomagnetic Activity 31 July - 06 August 2017

Solar activity was mostly at very low levels with low levels observed on 01 August due to an isolated C1 flare observed at 01/0747 UTC. Region 2670 (S05, L=119, class/area Cso/160 on 02 Aug) rotated around the east limb on 02 Aug. This region was the return of old Region 2665 which was responsible for two M-class flares as well as a fast halo CME on the far side of the Sun. However, during its return on the visible disk, the region has been relatively quiet and stable, only managing to produce B-class flares with the exception of the aforementioned C1 flare that occurred as it was rounding the eastern limb. No Earth-directed coronal mass ejections were observed during the period.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at moderate levels on 04 Aug and high levels from 31 Jul-03 Aug and again from 05-06 Aug. The largest flux of the period was 8,649 pfu observed at 06/1715 UTC.

Geomagnetic field activity ranged from quiet to active levels over the period. The period began at nominal levels with solar wind speeds near 340 km/s and total field around 4 nT. A solar sector boundary crossing from a positive sector to a negative sector was observed around midday on 01 Aug along with an increase in total field to near 10 nT and an increase in solar wind speed to near 450 km/s. A general decrease in total field and solar wind speed to nominal levels was observed on 02 Aug. The geomagnetic field responded with quiet conditions on 31 Jul and 02 Aug with an isolated unsettled period on 01 Aug. At approximately 03/1000 UTC, an increase in total field was observed to 20 nT followed by an increase in solar wind speed to near 750 km/s as a corotating interaction region preceded an positive polarity coronal hole high speed stream (CH HSS). Phi angle rotated into a mostly positive orientation around 04/0220 UTC and remained positive through the rest of the period. Solar wind speed began a slow decline late on 05 Aug after having reached a maximum of 794 km/s at 05/1216 UTC. Quiet to active levels were observed on 03 Aug and 05-06 Aug with unsettled to active levels on 04 Aug.

Forecast of Solar and Geomagnetic Activity 07 August - 02 September 2017

Solar activity is expected to be at very low levels throughout the forecast period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach moderate levels on 08, 17, and 31 Aug while high levels are expected on 07, 09-16, 18-30 Aug and from 01-02 Sep due to CH HSS influence.

Geomagnetic field activity is expected to be unsettled to active levels from 07-09 Aug, 17-22 Aug, and 30 Aug-02 Sep with G1 (Minor) geomagnetic storm levels likely on 18, 31 Aug and again on 01 Sep due to recurrent CH HSS activity.

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