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
FXXX12 KWNP 261231

:Product: Forecast Discussion
:Issued: 2017 Mar 26 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. Newly emerged Region 2644 (N13E36,
Dro/beta) produced a few B-class x-ray enhancements. Region 2643
(N08E10, Axx/alpha) continued its slow decaying trend. No Earth-directed
CMEs were observed in available coronagraph imagery.

Solar activity is expected to continue at very low levels throughout the
forecast period (26-28 Mar).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached high levels this period
with a peak flux of 8,820 pfu observed at 25/1710 UTC.  The greater than
10 MeV proton flux was steady at background levels throughout the

The greater than 2 MeV electron flux is expected to continue to high
levels until late on day one (26 Mar) when an increase in geomagnetic
field activity is expected to cause a decrease to normal to moderate
levels for days two and three (27-28 Mar).  The greater than 10 MeV
proton flux is expected to persist at background levels throughout the
forecast period (26-28 Mar).

Solar Wind

.24 hr Summary...
Solar wind parameters, as measured by the DSCOVR spacecraft, reflected a
relatively nominal environment. Total magnetic field strength remained
below 5 nT while Bz mostly varied between +/- 2 nT. Solar wind speeds
steadily decreased from 500 km/s to near 400 km/s by the periods end.
Phi angle rotated towards the negative sector between roughly
25/1430-2330 UTC and was in the positive sector for the remainder of the

Solar wind parameters are expected to become enhanced beginning late on
day one through day three (26-28 Mar) due to the onset of a CIR followed
by the influence of a recurrent, negative polarity CH HSS. Recurrence
and STEREO-A data suggest solar wind speeds in the 650-700 km/s range
are likely during the passage of this feature.


.24 hr Summary...
The geomagnetic field was quiet under a nominal solar wind regime.

The geomagnetic field is expected to reflect the onset of a CIR with
active conditions late on day one (26 Mar). G1 (Minor) geomagnetic storm
levels are likely on day two and three (27-28 Mar), with isolated G2
(Moderate) conditions likely on day three (28 Mar), in response to the
influence of a negative polarity CH HSS that is expected to be be
persistently strong. is the U.S. government's official web portal to all federal, state and local government web resources and services.