Product: Forecast Discussion Issued: 2019 Aug 16 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
.24 hr Summary… Solar activity was very low under a spotless visible disk. No Earth-directed CMEs were observed in available coronagraph imagery.
.Forecast… Solar activity is expected to remain very low on 16-18 Aug.
.24 hr Summary… The greater than 2 MeV electron flux was at high levels with a maximum flux of 5,230 pfu at 15/1915 UTC. The greater than 10 MeV proton flux remained at background levels.
.Forecast… The greater than 2 MeV electron flux is expected to continue at moderateto high levels on 16-18 Aug. The greater than 10 MeV proton flux is expected to remain at background levels.
.24 hr Summary… Solar wind parameters reflected near background solar wind conditions. Wind speeds gradually decreased from near 440 km/s to an average of about 400 km/s. Total field ranged between 2-7 nT while the Bz component was +/- 4 nT. Phi angle was predominately in a positive solar sector, but began taking brief excursions into a negative orientation late in the period.
.Forecast… The solar wind environment is expected to become slightly enhanced on 16 Aug when an anticipated weak, negative polarity CH HSS moves into a geoeffective position. A return to background conditions are expected for 17-18 Aug.
.24 hr Summary… The geomagnetic field was at quiet levels, with an isolated unsettled period.
.Forecast… The geomagnetic field is expected to be at mostly quiet to isolated unsettled levels for 16 Aug due to weak, negative polarity CH HSS effects. A return to mostly quiet conditions is anticipated on 17-18 Aug.
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