[Propagation+Space Weather] Weekly Propagation Summary - 2019 Dec 23 16:10 UTC

[nw7us@sunspotwatch.com]

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Here is this week's space weather and geophysical report, issued 2019 Dec 23 0449 UTC.

Highlights of Solar and Geomagnetic Activity 16 - 22 December 2019

Solar activity was very low. No Earth-directed CMEs were observed.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at normal levels on 16-18 Dec and reached moderate levels on 19-22 Dec. The largest flux of the period was 737 pfu observed at 22/1825 UTC.

Geomagnetic field activity ranged from quiet to active levels. Solar wind parameters were at nominal levels on 16-17 Dec with solar wind speeds between 330-425 km/s. By early on 18 Dec, total field increased to a maximum of 12 nT at 18/1015 UTC while solar wind speed increased to near 550 km/s by midday on 18 Dec as a positive polarity coronal hole high speed stream (CH HSS) moved into geoeffective position. By late on 19 Dec, solar wind speed was in decline and finished the period near 360 km/s. The geomagnetic field responded with quiet levels on 16-17 Dec and 20-22 Dec and quiet to active conditions on 18-19 Dec.

Forecast of Solar and Geomagnetic Activity 23 December - 18 January 2020

Solar activity is expected to be at very low levels for the forecast period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at moderate levels on 23 Dec-05 Jan and 15-18 Jan. Normal levels are expected on 06-14 Jan.

Geomagnetic field activity is expected to reach unsettled levels on 25-27 Dec and unsettled to active levels on 14-15 Jan due to CH HSS activity.

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