Subject: Weekly Highlights of Solar and Geomagnetic Activity, 28 July - 03 August 2025

:Product: Weekly Highlights and Forecasts
:Issued: 2025 Aug 04 0137 UTC
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# Weekly Highlights and Forecasts
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Highlights of Solar and Geomagnetic Activity
28 July - 03 August 2025

Solar activity was at low levels on 28 Jul - 02 Aug and moderate
(R1-Minor) levels on 03 Aug. The largest flare of the period was an
M2.9/2b event observed from Region 4168 (N05, L-103, class/area
Dai/060 on 03 Aug) at 03/1357 UTC. The region also produced numerous
C-class events. Numerous C-class activity was observed from Regions
4153 (S30, L=217, class/area Dai/210 on 25 Jul), 4155 (S10, L=192,
class/area Dai/070 on 26 Jul) and 4167 (N10, L=170, class/area
Dki/430 on 03 Aug). No Earth-directed CME activity was observed.

No proton events were observed at geosynchronous orbit.

The greater than 2 MeV electron flux at geosynchronous orbit reached
high levels on 28 Jul, 31 Jul and 01 Aug with a maximum flux of
1,870 pfu observed at 28/1520 UTC. Normal to moderate levels were
observed on 29-30 Jul and 02-03 Aug.

Geomagnetic field activity was at quiet to unsettled levels the
entire highlight period. A single active period was observed late on
03 Aug. A majority of the unsettled periods was due to weak negative
polarity CH HSS influence. Solar wind speeds were at mostly 400 km/s
from 28 Jul through midday on 30 Jul and 475-500 km/s from midday 30
Jul through 03 Aug with a peak velocity observed at 600 km/s late on
03 Aug.

Forecast of Solar and Geomagnetic Activity
04 August - 30 August 2025

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

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 12-18 Aug and 21-28 Aug all due to
recurrent CH HSS influences. Normal to moderate levels are expected
on 04-11 Aug, 18-19 Aug and 39-30 Aug.

Geomagnetic field activity is expected to be at active to G1 (Minor)
storm levels on11-15 Aug, 18-22 Aug and 25-30 Aug due to recurrent
CH HSS effects. Quiet to unsettled levels are expected on the
remaining days of the outlook period.


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