National Weather Service Weather Forecast Office

• Home
• Site Map
• News
• Organization
• Search for: NWS All NOAA 

000
FXXX12 KWNP 230032
DAYDIS

:Product: Forecast Discussion
:Issued: 2018 Apr 23 0030 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
#             Forecast Discussion
#
Solar Activity

.24 hr Summary...
Solar activity was very low. Region 2706 (N03E29, Dao/beta), the only
active region with sunspots on the visible disk, was stable throughout
the period. No Earth-directed CMEs were observed in available
coronagraph imagery.

.Forecast...
Solar activity is expected to be very low, with a chance for C-class
flare activity, over the next three days (23-25 Apr).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached high levels this period
with a peak flux of 21,400 pfu at 22/2020 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
each of the next three days (23-25 Apr) and the greater than 10 MeV
proton flux is expected to persist at background levels throughout the
forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters reflected weakening CH HSS influence this period.
Solar wind speeds decreased from initial values near 550 km/s to
end-of-period values of around 450 km/s. Total field strength values
varied between 3-5 nT and Bz was mostly neutral or northward. The phi
angle was steady in a negative solar sector orientation.

.Forecast...
Solar wind parameters are expected to continue a slow return to
background levels over the course of day one (23 Apr). Background solar
wind conditions are expected to prevail on days two and three (24-25
Apr).

Geospace

.24 hr Summary...
The geomagnetic field was quiet throughout period.

.Forecast...
The geomagnetic field is expected to be generally quiet over the next
three days (23-25 Apr) under a nominal solar wind regime.