Forecast Discussion

Product: Forecast Discussion Issued: 2019 Jul 31 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
Solar Activity
.24 hr Summary… Solar activity was very low. There were no sunspots, and there were no Earth-directed CMEs observed in available coronagraph imagery.
.Forecast… Solar activity is expected to remain very low on 31 Jul-02 Aug.
Energetic Particles
.24 hr Summary… The greater than 2 MeV electron flux was at normal levels, and the greater than 10 MeV proton flux remained at background values.
.Forecast… The greater than 2 MeV electron flux is expected to be at normal to moderate levels on 31 Jul-01 Aug, then increase to moderate to high levels on 02 Aug with CH HSS activity.
The greater than 10 MeV proton flux is expected to continue at background values.
Solar Wind
.24 hr Summary… Solar wind parameters were indicative of CH HSS influence. Wind speeds increased from ambient-like, background conditions to peaks just above 500 km/s. Total field also underwent enhancement reaching values of up to 11 nT, and the Bz component reached maximum, southward deflections of -8 nT. The Phi angle was predominately negative, but underwent brief excursions into the positive solar sector.
.Forecast… Enhanced conditions are expected on 31 Jul-01 Aug under the continuing influence of a negative polarity CH HSS. A return to background levels is anticipated on 02 Aug.
.24 hr Summary… The geomagnetic field was quiet to unsettled.
.Forecast… Unsettled to active levels are expected 31 Jul-01 Aug with a CH HSS. Quiet conditions return for 02 Aug.
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