Space Weather Forecast - Discussion

Issued: 2018 Sep 25 1230 UTC
Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center and processed by SpaceWeatherLive.com

Solar activity

24 h Summary

Solar activity was very low, and the visible disk was spotless. No Earth-directed CMEs were observed in available satellite imagery.

Forecast

Solar activity is expected to be at very low levels on 25-27 Sep.

Energetic Particles

24 h Summary

The greater than 2 MeV electron flux reached high levels during the period with a peak flux of 6,200 pfu observed at 24/2020 UTC. The greater than 10 MeV proton flux was steady at background levels throughout the period.

Forecast

The greater than 2 MeV electron flux is expected to reach high levels throughout the forecast period (25-27 Sep). The greater than 10 MeV proton flux is expected to persist at background levels throughout the forecast period.

Solar Wind

24 h Summary

Solar wind parameters have continued a downward trend from the waning influence of a negative polarity CH HSS. Solar wind speeds averaged around 430 km/s, total field peaked at 7 nT late in the period, and the Bz component has been +/- 5 nT. The phi angle was mostly negative. Forecast... Solar wind parameters are expected to remain slightly enhanced on 25-26 Sep under the waning influence of a negative polarity CH HSS. A return to mostly nominal conditions is expected by 27 Sep.

Geospace

24 h Summary

The geomagnetic field was at quiet to unsettled levels as a result of residual CH HSS (negative) effects.

Forecast

The geomagnetic field is expected to be at quiet to unsettled levels on 25-26 Sep. Mostly quiet levels are expected on 27 Sep with a return to background solar wind conditions.