Routine Space Environment Product (Daily)
Issued by NWS

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
FXXX12 KWNP 181230

:Product: Forecast Discussion
:Issued: 2018 Mar 18 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 (N19W60, Bxo/Beta) began to
show signs of decay since emerging last 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 (18-20 Mar).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached high levels with a maximum
flux of 7,560 pfu observed at 17/1900 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
each of the next three days (18-20 Mar) following a period of enhanced
solar wind. The greater than 10 MeV proton flux is expected to remain at
background levels throughout the forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters reflected the diminishing influence of a CH HSS.
Solar wind speeds were variable and reached a peak of 545 km/s
mid-period. Total field strength values normalized following a
mid-period enhancement and the Bz component ranged between +/-3 nT.  The
phi angle was variable throughout the period.

Solar wind parameters are expected to remain slightly enhanced on
day one (18 Mar) due to diminishing CH HSS influence. Solar wind
parameters are expected to gradually return to background levels over
the course of days two and three (19-20 Mar) as CH HSS influence
subsides and a nominal solar wing regime prevails.


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

The geomagnetic field is expected to be quiet and unsettled over the
next three days (18-20 Mar) under waning CH HSS influence. is the U.S. government's official web portal to all federal, state and local government web resources and services.