Routine Space Environment Product (Daily)
Issued by NWS

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FXXX12 KWNP 220031

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

Solar activity is expected to be very low all three days (22-24 Mar).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux was high, with a maximum flux of
22,143 pfu at 21/1940 UTC. The greater than 10 MeV proton flux continued
at background values.

The greater than 2 MeV electron flux is expected to be at normal to high
levels on day one (22 Mar), and increase to moderate and high levels on
days two and three (23-24 Mar) due to CH HSS effects. The greater than
10 MeV proton flux is expected to remain at background levels all three

Solar Wind

.24 hr Summary...
Solar wind parameters were indicative of a slow solar wind regime. Total
IMF strength ranged primarily from 2 to 5 nT. The Bz component underwent
mainly weak deviations. Solar wind speed decreased from early period
speeds of 380-420 km/s to about 315-340 km/s by periods end. The phi
angle was predominantly negative.

The solar wind environment is expected to become disturbed and enhanced
on day one (22 Mar) due to the possible influence of a CH HSS. The solar
wind environment is expected to remain disturbed, but weaken, on day two
(23 Mar) due to waning influences of the CH HSS. The solar wind
environment is expected to become enhanced again on day three (24 Mar)
due to the potential onset of a negative polarity, extension of the
south polar CH HSS.


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

The geomagnetic field is expected to be quiet to active, with a likely
late period of G1 (Minor) conditions on day one (22 Mar) in response to
the disturbed and enhanced solar wind environment. Days two and three
(23-24 Mar) are likely to experience quiet to active conditions, with a
chance for G1 conditions on day three, due to effects associated with
the CH HSS activity. is the U.S. government's official web portal to all federal, state and local government web resources and services.