Routine Space Environment Product (Daily)
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FXXX12 KWNP 190031

:Product: Forecast Discussion
:Issued: 2018 Mar 19 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. Region 2702 (N19W60, Bxo/Beta) was quiet
and stable during the period. No Earth-directed CMEs were observed in
available coronagraph imagery.

Solar activity is expected to continue at very low levels over the next
three days (19-21 Mar).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached high levels with a maximum
flux of 5,070 pfu observed at 18/0010 UTC. The greater than 10 MeV
proton flux was steady at background values.

The greater than 2 MeV electron flux is expected to reach high levels on
days one and two (19-20 Mar) following a period of enhanced solar wind.
A return to normal to moderate levels is anticipated on day three (21
Mar) due to electron distribution. The greater than 10 MeV proton flux
is expected to remain at background levels throughout the forecast

Solar Wind

.24 hr Summary...
Solar wind parameters reflected continued influence of a negative
polarity CH HSS. Solar wind speeds averaged about 500 km/s through about
18/1415 UTC when an increase to about 550-590 km/s was observed through
periods end. Total field strength generally ranged between 1-5 nT with
an enhancement of near 11 nT at 18/1354 UTC. The Bz component varied
weakly between +/-3 nT with increased variability between +/-8 nT
evident after 18/1400 UTC. The phi angle was variable throughout the

Solar wind parameters are expected to gradually return to background
levels on day one (19 Mar) as CH HSS influence subsides. Enhanced solar
wind parameters are expected to return by early on day two (20 Mar) and
further increase on day three (21 Mar) due to influence from a series of
negative polarity CH HSSs.


.24 hr Summary...
The geomagnetic field ranged from quiet to G2 (Moderate) storm levels
under persistent CH HSS influence. G2 (Moderate) storm levels were
observed during the 18/2100-2400 UTC period.

The geomagnetic field is expected to be at G1-G2 (Minor-Moderate) storm
levels early on day one (19 Mar) follow by quiet to active levels under
persistent CH HSS influence. By day two (20 Mar), activity levels are
expected to be at quiet to unsettled levels, increasing to quiet to
active levels by day three (21 Mar) due to influence from negative
polarity CH HSSs. is the U.S. government's official web portal to all federal, state and local government web resources and services.