Subject: Weekly Highlights of Solar and Geomagnetic Activity, 02 - 08 June 2025

:Product: Weekly Highlights and Forecasts
:Issued: 2025 Jun 09 0153 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
02 - 08 June 2025

Solar activity ranged from low to moderate levels. Regions 4100
(N08, L=245, class/area Eki/440 on 31 May) and 4105 (S15, L=130,
class/area Eai/130 on 05 Jun) produced a few weak M-class (R1/Minor)
flares this period. The largest event was an M3.3/2b flare observed
at 02/1118 UTC from Region 4100. Weak, Earth-directed CME signatures
were observed on 03 and 07 June.

The greater than 10 MeV proton event that began at 31/1710 UTC,
reached the S2 (Moderate) levels at 01/0540 UTC, peaked at 666 pfu
at 01/0915 UTC, decreased below S2 levels at 01/1245 UTC and ended
at 02/0520 UTC.

The greater than 2 MeV electron flux at geosynchronous orbit was at
high levels on 02-06 June with a peak flux of 5,180 pfu observed at
06/1615 UTC. Normal to moderate levels were observed on 07-08 June.

Geomagnetic field activity was at Minor (G1) to Strong (G3) levels
on 02-04 June due to CME effects. During this period, total field
(Bt) peaked at 17 nT while Bz reached a southward extent of -15 nT.
Wind speeds began the period at 900 km/s, but decayed to near 500
km/s by 04 June. Mostly quiet to active levels were observed on
05-08 June under weaker CME effects coupled with some negative
polarity CH HSS effects.

Forecast of Solar and Geomagnetic Activity
09 June - 05 July 2025

Solar activity is expected to be at a chance for R1-R2
(Minor-Moderate) levels throughout the outlook period due to
multiple regions on the visible disk as well as multiple active
regions scheduled to return from the farside of the Sun.

No proton events are expected at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to be at high levels on 15-22 Jun, 26-29 Jun and 02-04 Jul
following recurrent coronal hole influence. The remainder of the
period is expected to be at normal to moderate levels.

Geomagnetic field activity is expected to be at some elevated levels
due to anticipated influence from multiple, recurrent coronal holes
and some CME influence early in the outlook period. G1 (Minor)
geomagnetic storms are likely on 09 and 13 Jun due to CME and CH HSS
effects with G2 (Moderate) effects likely on 14-15 Jun due to
positive polarity CH HSS effects. G1 (Minor) to G2 (Moderate)
effects are likely on 25-26 Jun due to negative polarity CH HSS
effects. Quiet to unsettled levels are likely for the remainder of
the outlook period.


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