Routine Space Environment Product (Daily)
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FXXX12 KWNP 191231

:Product: Forecast Discussion
:Issued: 2018 Mar 19 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. Region 2702 (N19W74, Bxo/Beta) exhibited
minor decay throughout 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 4,470 pfu observed at 18/1950 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 and moderate levels is anticipated on day three (21
Mar) due to electron redistribution. 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 the diminishing influence of a CH HSS
this period. Solar wind speeds steadily increased from initial values
near 510-525 km/s to a peak value of around 600 km/s, observed between
19/0330-0430 UTC. Total field strength values reached a peak of 10 nT
early in the period and Bz was sustained southward between 18/1800-2230
UTC, with a peak deflection of around -10 nT. The phi angle was
generally steady in a negative solar sector orientation.

Solar wind parameters are expected to remain enhanced, but slowly
decrease over the course of days one and two (19-20 Mar) as CH HSS
influence wanes. Another solar wind enhancement is expected on day three
(21 Mar) as another CH HSS becomes geoeffective.


.24 hr Summary...
The geomagnetic field reached G1-G2 (Minor-Moderate) storm levels
in response to a prolonged period of southward Bz. G2 (Moderate) storm
levels were observed during the 18/2100-2400 UTC period.

The geomagnetic field is expected to be quiet and unsettled for the
remainder of day one and day two (19-20 Mar) under diminishing CH HSS
influence.  Active conditions are expected on day three (21 Mar) as
another CH HSS becomes geoeffective. is the U.S. government's official web portal to all federal, state and local government web resources and services.