Routine Space Environment Product (Daily)
Issued by NWS

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000
FXXX12 KWNP 260030
DAYDIS

:Product: Forecast Discussion
:Issued: 2017 Apr 26 0030 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
# http://www.swpc.noaa.gov/wwire.html
#
#             Forecast Discussion
#
Solar Activity

.24 hr Summary...
Solar activity was very low. There were three numbered sunspot regions
on the visible disk. Region 2652 (N13W13, Axx/alpha) and Region 2653
(S11E21, Hax/alpha) were mostly stable and inactive. Region 2651
(N11W23, Hsx/alpha) exhibited signs of slight decay, but did have a B7
flare originate from nearby. No Earth-directed CMEs were observed in
available coronagraph imagery.

.Forecast...
Solar activity is expected to be very low with a chance for C-class
flare activity over the next three days (26-28 Apr).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at moderate to high levels with
a peak flux of 52,302 pfu observed at 25/1605 UTC. The greater than 10
MeV proton flux was at background values.

.Forecast...
The greater than 2 MeV electron flux is expected to reach high to very
high levels over the next three days (26-28 Apr) due to CH HSS effects.
No solar radiation storms are expected during the forecast period.

Solar Wind

.24 hr Summary...
The solar wind environment was enhanced due to the waning effects of a
negative polarity CH HSS. Solar wind speeds continued a downward trend
throughout the period, beginning at around 650 km/s, and ending around
510 km/s. Total field strength ranged between 3 and 5 nT, while the Bz
component reached a maximum southward deflection of -4 nT. Phi angle was
oriented in a negative sector.

.Forecast...
The solar wind environment is expected to remain enhanced, but waning
over the next three days (26-28 Apr) due to the influence of the
negative polarity CH HSS.

Geospace

.24 hr Summary...
The geomagnetic field was at quiet to unsettled levels, with isolated
active levels during the first synoptic period of the day, due to the
effects of a negative polarity CH HSS.

.Forecast...
CH HSS influences will gradually subside over the next three days.
Isolated G1 (Minor) storm levels are likely on day one (26 Apr).
Otherwise, quiet to active conditions are anticipated. Mainly quiet to
unsettled periods are expected on day two (27 Apr) with the possibility
of isolated active periods. The geomagnetic field is expected to be
quiet to unsettled on day three (28 Apr) as the bulk of the CH HSS moves
into an increasingly less geoeffective position.


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