Weekly Space Weather Highlights

Highlights of Solar and Geomagnetic Activity
09 - 15 September 2019

Solar activity was at very low levels. No spots were observed on the
visible disk. 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
moderate to high levels throughout the summary period due to
influence from multiple CH HSSs. A maximum flux of 8,450 pfu was
observed at 09/1745 UTC. 

Geomagnetic field activity ranged from quiet to active levels. An
isolated period of active was observed on 09 Sep in response to a
positive polarity CH HSS increasing solar wind speeds to ~525 km/s.
Isolated unsettled conditions, associated with further enhancements
from multiple positive polarity CH HSSs, were observed on 12-15 Sep.
Quiet conditions were observed over the remainder of the summary

Forecast of Solar and Geomagnetic Activity
16 September - 12 October 2019

Solar activity is expected to be at very low levels over the outlook

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 16-19 Sep and 27 Sep - 12 Oct.
Moderate levels are expected from 20-26 Sep. All enhancements in
electron flux are due to elevated wind speeds from multiple,
recurrent, CH HSSs. 

Geomagnetic field activity is expected to range from quiet to G2
(Moderate) storm levels. G2 conditions are likely on 27-28 Sep; G1
(Minor) conditions are likely on 29 Sep; active conditions are
likely on 30 Sep and 02 Oct; unsettled conditions are likely on
16-18 Sep, 23 Sep, 26 Sep, 01 Oct, 03 Oct, 06 Oct, 10 Oct and 12
Oct. All enhancements in geomagnetic active are in response to the
anticipated influence of multiple, recurrent CH HSSs. The remainder
of the outlook period is expected to be mostly quiet under nominal
solar wind conditions.