:Product: Weekly Highlights and Forecasts
:Issued: 2026 Jun 08 0243 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC contact on the Web
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# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity
01 - 07 June 2026

Solar activity reached high levels on 03 Jun when Region 4455 (N14,
L=88, class/area=Dki/360 on 03 Jun) produced an M9.3/Sf flare
(accompanied by Type-II (253 km/s) and Type-IV sweeps, and a 360 sfu
Tenflare) at 03/0136 UTC, followed by an M7.7/1b flare (accompanied
by Type-II (313 km/s) and Type-IV radio sweeps, and a 540 sfu
Tenflare with Castelli-U signature) at 03/0700 UTC, and finally an
X1.0/1n flare (accompanied by a Type-IV sweep and a 180 sfu
Tenflare) at 03/1128 UTC. The CMEs associated with the three
significant flares from AR4455 on 03 Jun arrived at Earth on 05 Jun.
Other activity included an M1.8/2n (accompanied by Type-II (838
km/s) and 190 sfu Tenflare) flare at 06/1401 UTC from Region 4461
(S20, L=09, class/area=Dao/70 on 02 Jun). The resulting partial-halo
CME, first visible in LASCO C2 imagery at 06/1401 UTC, is
anticipated to arrive at Earth around midday on 08 Jun.

The greater than 10 MeV proton flux became slightly enhanced after
midday on 06 Jun following the M1.8/2n flare at 06/1401 UTC from
Region 4461, but remained below event levels with a peak flux of 1.0
pfu observed at 06/1940 UTC. The greater than 10 MeV proton flux
gradually returned to background levels on 07 Jun.

The greater than 2 MeV electron flux at geosynchronous orbit was at
normal to moderate levels on 01-05 Jun, with high levels observed on
06-07 Jun.

Geomagnetic field activity reached G1-G2 (Minor-Moderate) storm
levels on 05 Jun, and active levels on 06 Jun, following the arrival
and passage of the CMEs from 03 Jun. The shock arrival was observed
beginning at around 05/0425 UTC, and in the hours following the
total magnetic field strength (Bt) reached 20 nT, the Bz component
reached as far southward as -17 nT, and solar wind speeds increased
to a peak near 740 km/s. Quiet and quiet to unsettled levels under
weak coronal hole high speed stream influences prevailed throughout
the remainder of the period.



Forecast of Solar and Geomagnetic Activity
08 June - 04 July 2026

Solar activity is expected to be at predominately low levels through
04 Jul, with M-class flare probabilities ranging from a chance to
likely levels throughout the period.

No proton events are expected at geosynchronous orbit, barring
significant flare activity.

The greater than 2 MeV electron flux at geosynchronous orbit is
expected to reach high levels on 09-10, 13-18 Jun and 04 Jul. Normal
to moderate levels are expected to prevail throughout the remainder
of the period.

Geomagnetic field activity is likely to reach G1-G3 (Minor-Strong)
storm levels on 08 Jun, with G1-G2 (Minor-Moderate) levels likely on
09 Jun, due to the anticipated arrival of the CME that left the Sun
on 06 Jun. Periods of active conditions are likely on 23-26 Jun due
to recurrent CH HSS influences. Quiet and quiet to unsettled levels
are expected to prevail throughout the remainder of the period.


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