Routine Space Environment Product (Daily)
Issued by NWS

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000
FXXX12 KWNP 220031
DAYDIS

:Product: Forecast Discussion
:Issued: 2017 Jul 22 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
(22-24 Jul).

Energetic Particles

.24 hr Summary...
The greater than 2 MeV electron flux was at normal to high levels with a
peak of 1,270 pfu at 21/1515 UTC. The greater than 10 MeV proton flux
was 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 (22-24 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 influence of a positive polarity CH
HSS. Solar wind speeds began the period near 490 km/s, achieved a period
maximum of 785 km/s, then decreased to period ending values of
approximately 650 km/s. Total field measurements ranged between 4 and 10
nT while the Bz component dropped as low as -7 nT. The phi angle was
positive.

.Forecast...
Solar wind parameters are expected to decrease over days one and two
(22-23 Jul), returning to nominal conditions by day three (24
Jul).

Geospace

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

.Forecast...
The geomagnetic field is expected to be at quiet to active levels on day
one (22 Jul), followed by quiet to unsettled conditions on day
two (23 Jul) as CH HSS effects persist. A return to mostly quiet
conditions is forecast for day three (24 Jul) as CH effects gradually
taper.



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