Subject: Weekly Highlights of Solar and Geomagnetic Activity, 21 - 27 August 2023

:Product: Weekly Highlights and Forecasts
:Issued: 2023 Aug 28 0230 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
21 - 27 August 2023

Solar activity ranged from low to moderate. Region 3415 (S09, L=79, class/area=Dko/350 on 24 Aug) produced the strongest flare of the
period, a long-duration M1.4/1n at 25/0109 UTC. Lower M-class X-ray
flares (R1 - Minor) were observed from Region 3405 (N10, L=183, class/area=Eso/180 on 16 Aug) and an area around the E limb. The
remaining active regions were relatively simple.

Other activity included a Type II radio sweep on 26 Aug which was
associated with activity just past the Sun's visible disk. None
of the CMEs observed in available coronagraph imagery appeared to on
the Sun-Earth line.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was low
to moderate levels over the reporting period.

Geomagnetic field activity ranged from quiet to active conditions. A
single period of active conditions were observed 27 Aug due to a
period of sustained Bz south that reached -7 nT. Only quiet to
unsettled conditions were observed for the remainder of the
reporting period.

Forecast of Solar and Geomagnetic Activity
28 August - 23 September 2023

Solar activity is expected to be at low levels with a slight chance
for M-class (R1-R2 Minor-Moderate) activity throughout the outlook
period.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected reach high levels on 07-10 Sep due to recurrent CH HSS
influence. The remaining days are likely to be at background to
moderate levels.

Geomagnetic field activity is expected to range from quiet to active
levels. Active conditions are likely on 14 Sep, with unsettled
conditions likely on 28-19 Aug, 06-08 Sep, 15-17 Sep and 23 Sep. All
elevations in geomagnetic activity are anticipated due to recurrent
CH HSS features. The remainder of the outlook period is expected to
be at quiet levels.


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* Origin: NOAA Space Weather Prediction Center (3:633/280.2@fidonet)