Routine Space Environment Product (Daily)
Issued by NWS

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FXXX12 KWNP 211231

:Product: Forecast Discussion
:Issued: 2018 Mar 21 1230 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 and the visible disk was spotless. No CMEs
were observed in available coronagraph imagery.

Solar activity is expected to be very low all three days (21-23 Mar).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux was high, with a maximum flux of
approx 22,100 pfu at 20/2120 UTC. The greater than 10 MeV proton flux
was at background levels.

The greater than 2 MeV electron flux is expected to be at normal to high
levels on all three days (21-23 Mar). The greater than 10 MeV
proton flux is expected to remain at background levels all three days.

Solar Wind

.24 hr Summary...
Solar wind parameters were at nominal levels during the period. Total
field and Bz were both at benign values. Solar wind speed decreased from
speeds near 450 km/s down to 350 km/s by periods end. The phi angle was

The solar wind environment is anticipated to become enhanced on day one
(21 Mar) due to influences ahead of an extension of the south,
polar-connected CH HSS. Elevated solar wind speed is expected on days
two and three (22-23 Mar) due to continuing influences of the CH HSS.


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

The geomagnetic field is expected to be quiet to unsettled, with likely
periods of active conditions later on day one (21 Mar) due to CH HSS
effects. Geomagnetic activity on day two (22 Mar) is expected to be
mainly unsettled to active, with a likely period of G1 (Minor) storm
conditions due to the effects of the CH HSS. Day three (23 Mar) is
likely to see unsettled to active conditions, with a chance for G1 storm
conditions due to continuing CH HSS influences. is the U.S. government's official web portal to all federal, state and local government web resources and services.