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514
FXXX12 KWNP 240031
DAYDIS

:Product: Forecast Discussion
:Issued: 2017 Jul 24 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 no numbered sunspots on the
visible disk. No Earth-directed CMEs were observed in available
satellite imagery.

.Forecast...
Solar activity is expected to be very low on days one through three
(24-26 Jul).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to high levels with a
peak of 5,776 pfu observed at 23/1530 UTC. The greater than 10 MeV
proton flux remained at background levels during the reporting period.

.Forecast...
The greater than 2 MeV electron flux is expected to reach high levels
over the next three days (24-26 Jul). The greater than 10 MeV proton
flux is expected to remain at background levels throughout the forecast
period.

Solar Wind

.24 hr Summary...
Solar wind parameters reflected the continued influence of a positive
polarity CH HSS. Solar wind speed began the period near 600 km/s,
decreased to 515 km/s, and increased again to end the period at 600
km/s. Total field measurements ranged between 1 and 9 nT while the Bz
component dropped to a low value of -6 nT. The phi angle was in a
positive orientation.

.Forecast...
Solar wind parameters are expected to demonstrate gradual waning towards
nominal conditions throughout the forecast period (24-26 Jul).

Geospace

.24 hr Summary...
The geomagnetic field was at quiet to active levels due to continued
positive polarity CH HSS effects.

.Forecast...
The geomagnetic field is expected to be at quiet to unsettled, with
isolated active levels, on day one (24 Jul) as CH HSS influence wanes.
Mostly quiet conditions are expected to prevail on days two and three
(25-26 Jul) as nominal conditions return.