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FXXX12 KWNP 290030

:Product: Forecast Discussion
:Issued: 2017 Apr 29 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 with only an isolated B1 flare observed at
28/1712 UTC from Region 2653 (S09W20, Hsx/alpha).  The rest of the
spotted regions were stable and quiet.  New Region 2654 (N10E52,
Axx/alpha) was numbered today.

A prominence eruption was observed at approximately 28/1530 UTC off the
NW limb at North 35.  We are currently waiting on coronagraph imagery to
determine if there is an Earth-directed component to an associated CME.

Solar activity is expected to be very low with a slight chance for
C-class flare activity over the next three days (29 Apr-01 May).

Energetic Particle

.24 hr Summary...
The greater than 2 MeV electron flux reached very high levels with a
peak flux of 56,297 pfu observed at 28/1645 UTC.  The greater than 10
MeV proton flux was at background levels.

The greater than 2 MeV electron flux is expected to fluctuate between
high and very high levels on day one (29 Apr) with the possibility of
returning to predominately high levels by days two and three (30 Apr-01
May).  The greater than 10 MeV proton flux is expected to continue at
background levels all three days.

Solar Wind

.24 hr Summary...
Solar wind parameters were near nominal levels over the period with
solar wind speeds in the 370-480 km/s range.  Total field was steady
near 5 nT with the Bz component between +/-5 nT.  Phi angle was oriented
in a negative (towards) sector.  NOTE:  From 28/1727-1913 UTC, solar
wind speed, temperature, and density registered incorrect readings.

Solar wind parameters are expected to be at nominal levels on day one
and through the majority of day two (29-30 Apr).  By late on day two, a
solar sector boundary crossing (SSBC) into a positive (away) sector is
expected followed by weak CH HSS influence from a positive polarity CH
HSS.  Enhanced solar wind parameters are expected to persist into day
three (01 May).


.24 hr Summary...
The geomagnetic field was quiet.

The geomagnetic field is expected to be mostly quiet on day one (29
Apr).  By late on day two and continuing into day three (30 Apr-01 May),
an SSBC followed by a possible weak positive polarity CH HSS is expected
to cause quiet to unsettled conditions with isolated active periods on
01 May. is the U.S. government's official web portal to all federal, state and local government web resources and services.