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Old December 26th 16, 05:30 PM posted to rec.radio.amateur.dx,rec.radio.amateur.space,rec.radio.shortwave,rec.radio.info
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Default Weekly Highlights of Solar and Geomagnetic Activity, 19 - 25 December 2016

:Product: Weekly Highlights and Forecasts
:Issued: 2016 Dec 26 0416 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/weekly.html
#
# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
19 - 25 December 2016

Solar activity was at background levels through the period.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels throughout the reporting period with a peak flux of
29,524 pfu on 24/1830 UTC.

Geomagnetic field activity was quiet levels on 19 Dec and mostly
quiet levels with an isolated period of unsettled conditions on 20
Dec. Activity increased to active with an isolated period of G2
(Moderate) storm levels late on 21 Dec due to the onset of a
positive polarity CH HSS increasing wind speeds from around 350 km/s
to over 650 km/s. An isolated period of G1 (Minor) was observed
early on 22 Dec before geomagnetic activity decreased to unsettled
and activity conditions through 23 Dec. 24 Dec underwent a further
decrease with quiet to unsettled conditions throughout the day
despite wind speeds maintaining between 600-750 km/s. Quiet to
unsettled conditions were isolated by frequent periods of active
levels on 25 Dec as the influence of a positive polarity CH HSS
continued to keep solar wind speeds enhanced to around 700 km/s.

Forecast of Solar and Geomagnetic Activity
26 December - 21 January 2017

Solar activity is expected to be at very low levels throughout the
outlook period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels from 26-29 Dec, 31 Dec-02 Jan, 04-13
Jan, and 18-21 Jan due to multiple CH HSS influences; normal to
moderate levels are expected on 30 Dec, 03 Jan, and 14-17 Jan.

Geomagnetic field activity is expected to be at quiet to G1 (Minor)
levels on 26 Dec due to CH HSS influences. G1 (Minor) conditions are
also likely on 04-05 Jan and 17-19 Jan. Active conditions are likely
on 30 Dec, 06-07 Jan, and 20-21 Jan. Unsettled conditions are likely
on 31 Dec, 02-03 Jan, 08 Jan, and 14 Jan. All anticipated
enhancements in field activity are due to recurrent CH HSSs. Mostly
quiet conditions are expected for the remainder of the outlook
period.

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