:Product: Forecast Discussion
:Issued: 2019 Apr 25 0030 UTC
# Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
#
Solar Activity

.24 hr Summary...
Solar activity was very low under a spotless solar disk. No
Earth-directed CMEs were observed in available satellite imagery.

.Forecast...
Solar activity is expected to be very low for the forecast period (25-27
Apr).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to moderate 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 25 Apr with a chance for high levels on 26-27 Apr due
to CH HSS influences. The greater than 10 MeV proton flux is expected to
continue at background levels.

Solar Wind

.24 hr Summary...
Solar wind parameters were at nominal levels over the period with solar
wind speed ranging from 360-430 km/s. Total field ranged from 3-6 nT
while the Bz component was between +3/-4 nT. Phi angle was oriented in a
mostly negative (towards) solar sector.

.Forecast...
A negative polarity CH HSS is expected to become geoeffective on 25 Apr
causing an enhancement in solar wind parameters. Solar wind speeds in
the 500-600 km/s range are likely, based on STEREO A data. CH HSS
influence is expected to slowly diminish on 26-27 Apr.

Geospace

.24 hr Summary...
The geomagnetic field was quiet to unsettled.

.Forecast...
Unsettled to active conditions are expected on 25 Apr due with the
arrival of a negative polarity CH HSS. Quiet to unsettled levels are
expected on 26 Apr as HSS influences slowly diminish. Mostly quiet
conditions are expected to return on 27 Apr.