Routine Space Environment Product (Daily)
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FXXX12 KWNP 220030

:Product: Forecast Discussion
:Issued: 2018 Apr 22 0030 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
#             Forecast Discussion
Solar Activity

.24 hr Summary...
Solar activity was very low. New Region 2707 (S10E29, Axx/alpha) emerged
this period. Region 2706 (N04E43, Dao/beta) exhibited minor growth and
development and produced multiple low-level B-class flares. No
Earth-directed CMEs were observed in available coronagraph imagery.

Solar activity is expected to continue at very low levels, with a chance
for C-class flare activity, throughout the forecast period (22-24 Apr).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached high levels with a peak
flux of 21,100 pfu at 21/1940 UTC. The greater than 10 MeV proton flux
was steady at background levels.

The greater than 2 MeV electron flux is expected to reach high levels
each of the next three days (22-24 Apr) and the greater than 10 MeV
proton flux is expected to continue at background levels throughout the
forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters reflected the weakening influence of a negative
polarity CH HSS. Solar wind speeds slowly decreased from initial values
of around 625 km/s to end-of-period values of around 550 km/s. Total
field strength was steady near 5 nT and Bz was mostly neutral or
northward throughout the period.

Solar wind parameters are expected to continue a slow return to
near-background levels over the course of day one (22 Apr) as CH HSS
influence subsides. A background solar wind environment is expected on
days two and three (23-24 Apr) with the return of a nominal solar wind


.24 hr Summary...
The geomagnetic field was quiet and unsettled this period under
weakening CH HSS influence.

The geomagnetic field is expected to be quiet and unsettled on day one
(22 Apr) as CH HSS influence wanes. Generally quiet conditions are
expected on days two and three (23-24 Apr) as a nominal solar wind
regime prevails. is the U.S. government's official web portal to all federal, state and local government web resources and services.