By: Gordon Rutherford
:Product: Forecast Discussion
:Issued: 2017 Jul 13 1230 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Wind (24 hr Summary)
Solar wind parameters reflected waning influence of a positive polarity CH HSS. Solar wind speed began near 510 km/s early and gradually decreased to speeds near 400 km/s. Total field strength values varied from 1 nT to 4 nT. The Bz component was variable, reaching a maximum southward deviation of -3 nT. The phi angle was in a mostly positive solar orientation throughout most of the period.
.Forecast...
Solar wind parameters are expected to gradually decrease on day one (13 Jul) as CH HSS influence subsides. An enhancement is anticipated on day two (14 Jul) and into day three (15 Jul) due to the arrival of a negative polarity CH HSS.
Solar Activity (24 hr Summary)
Solar activity was at very low levels this period as Region 2665 (S06W24, Ehi/beta) continued to show separation and decreased magnetic complexity. New Region 2666 (N13W13, Cro/beta remained inactive. A large CME was observed off the West limb, first visible in LASCO C2 imagery near 13/1300 UTC. Further analysis and WSA/Enlil modelling will be completed to determine if the event has an Earth-directed component.
.Forecast...
Solar activity is likely to be low with a slight chance for M-class (R1-R2/Minor-Moderate) flare activity over the next three days (13-15 Jul).
Energetic Particle (24 hr Summary)
The greater than 2 MeV electron flux reached moderate levels and the greater than 10 MeV proton flux was at background levels.
.Forecast...
The greater than 2 MeV electron flux is expected to be at moderate to high flux levels on days one through three (13-15 Jul) following the enhanced solar wind environment associated with CH HSS influence. The greater than 10 MeV proton flux is expected to persist at background levels throughout the forecast period.
Geospace (24 hr Summary)
The geomagnetic field was at quiet levels this period.
.Forecast...
The geomagnetic field is expected to be at quiet levels on day one (13 Jul) as CH influence continues to wane. Quiet to active conditions are expected on days two and three (14-15 Jul) due to the arrival of a negative polarity CH HSS.