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309
FXXX12 KWNP 241230
DAYDIS

:Product: Forecast Discussion
:Issued: 2017 Jun 24 1230 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. Regions 2662 (N13W72, Hrx/alpha) and 2664
(N18E28, Hsx/alpha) were both stable and absent of significant flare
activity. No Earth-directed CMEs were observed in available satellite
imagery.

.Forecast...
Solar activity is expected to be very low with a slight chance for
C-class flares over the next three days (24-26 Jun).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to moderate levels.
The greater than 10 MeV proton flux remained at background levels.

.Forecast...
The greater than 2 MeV electron flux is expected to persist at normal to
moderate levels for the remainder of day one (24 Jun). High levels are
likely on days two and three (25-26 Jun) in response to elevated wind
speeds from an anticipated positive polarity CH HSS. The greater than 10
MeV proton flux is expected to persist at background levels throughout
the forecast period.

Solar Wind

.24 hr Summary...
Solar wind parameters, as measured by the DSCOVR spacecraft, suggested a
slightly enhanced solar environment in response to positive polarity CH
HSS influence. Solar wind speeds steadily increased throughout the
period, starting at near 320 km/s and ending at approximately 400 km/s.
Total field strength reached a high value of 8 nT while the Bz
component dropped as low as -7 nT.  Phi angle remained oriented in a
positive solar sector throughout the reporting period.

.Forecast...
Solar wind parameters are expected to reflect minor enhancements from
the influence of positive polarity CH HSS. CH HSS effects are expected
to slowly wane over the next there days (24-26 Jun).

Geospace

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

.Forecast...
The geomagnetic field is expected to be mostly quiet to unsettled, with
isolated periods of active levels likely, on day one (24 Jun) due to the
persistent influence of a positive polarity CH HSS. Days two and three
(25-26 Jun) are expected to see field activity produce quiet to
unsettled conditions as influence of the CH HSS slowly subsides.