Subject: Weekly Highlights of Solar and Geomagnetic Activity, 17 - 23 June 2024

:Product: Weekly Highlights and Forecasts
:Issued: 2024 Jun 24 0141 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
17 - 23 June 2024

Solar activity ranged from low to high levels. Region 3723 (S18,
L=011, class/area=Dao/150 on 23 Jun) produced the strongest event of
the period, an impulsive M9.3/1b flare (R2-Moderate) at 23/1301 UTC.
Region 3719 (S15, L=067, class/area=Dao/230 on 23 Jun) also produced
an R2 event with an impulsive M5.7/1b flare at 20/2316 UTC. 12 other
low-level M-class (R1-Minor) events were observed from various
regions throughout the week. No Earth-directed CMEs were identified
with any of the flare events. Other activity included a Type-II
radio sweep on 17 Jun and an additional Type-II radio sweep on 22
Jun. Both radio sweeps were associated with eruptive activity that
was not on the Sun-Earth line.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels throughout the summary period.

No significant geomagnetic field activity was observed during the
summary period. Quiet to unsettled levels throughout week. Solar
wind conditions were influenced by the onset of a postive polarity
CH HSS which increased wind speeds to peak near 600 km/s on 18 Jun.
Wind speeds then steadily decreased to a low of 300 km/s late on 22
Jun. A weak transient feature was observed on 23 Jun with a
southward Bz of -10 nT observed, but combined with the slow wind
speeds, only unsettled levels were observed.

Forecast of Solar and Geomagnetic Activity
24 June - 20 July 2024

Solar activity is likely to reach moderate on 24-25 Jun due
primarily to the flare potential from active regions near the west
limb. A decrease to low levels, with a slight chance for M-class
activity (R1-R2/Minor-Moderate), is likely from 25 Jun - 20 July.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at low to moderate levels throughout the outlook
period.

Geomagnetic field activity is expected to reach unsettled levels on
24 Jun, 14-16 Jul, and 20 Jul due to anticipated influence from
multiple, recurrent, CH HSSs. The remainder of the outlook period is
likely to be at mostly quiet levels.


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