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FXXX12 KWNP 281231

:Product: Forecast Discussion
:Issued: 2017 Apr 28 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. Regions 2653 (S09W12, Hax/alpha) and 2651
(N10W56, Hsx/alpha) were both stable and inactive. No Earth-directed
CMEs were observed in available coronagraph imagery.

Solar activity is expected to be very low with a slight chance for
C-class flare activity over the next three days (28-30 Apr).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux reached very high levels with
a peak flux of 54,200 pfu observed at 27/1840 UTC. The greater than 10
MeV proton flux was at background values.

The greater than 2 MeV electron flux is expected to fluctuate between
high and very high levels for the next two days (28-29 Apr) with the
possibility of returning to predominately high levels by day three (30
Apr). No solar radiation storms are expected during the forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters were at nominal levels. Solar wind speeds began
the period around 450 km/s and decreased to around 375 km/s by the end
of the period. Total field strength averaged near 5 nT, while the Bz
component reached a maximum southward deflection of -3 nT. Phi angle was
oriented in a negative sector.

The solar wind environment is expected to remain slightly enhanced into
day one (28 Apr), and return to background levels on days two and three
(29-30 Apr).


.24 hr Summary...
The geomagnetic field was at quiet to unsettled levels.

The geomagnetic field is expected to be at mostly quiet to unsettled
levels on day one (28 Apr) as any lingering CH HSS influences are
expected to finally subside. Mostly quiet field conditions are
anticipated on days two and three (29-30 Apr) as solar wind parameters
return to background levels. is the U.S. government's official web portal to all federal, state and local government web resources and services.