Product: Weekly Highlights and Forecasts
:Issued: 2025 Jun 02 0216 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services
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# Weekly Highlights and Forecasts
#
Highlights of Solar and Geomagnetic Activity 26 May - 01 June 2025
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Solar activity ranged from low to high levels. Regions 4098 (S04, L=021, class/area Dai/180 on 26 May), 4100 (N08, L=244, class/area Eki/440 on 30 May) and 4104 (N06, L=216, class/area Dso/080 on 30 May) all produced M-class flare activity this period. A majority of the activity originated from Region 4100 to include the largest event of the period, a long duration M8.1 flare observed at 31/0005 UTC. Associated with this event was a 1,938 km/s Type II sweep, a Type IV sweep, a 1,000 sfu Tenflare and a Castelli-U radio signature. Wide-spread coronal dimming in EUV imagery was followed by a full-halo CME signature, first identified in GOES-19 CCOR-1 imagery at 31/0030 UTC. Model and analysis of this event suggested the CME's estimated time of arrival at Earth to be early to
midday on 01 Jun.
A 10 MeV proton event occured during the period associated with the CME event. 10 MeV protons first exceed the 10 pfu threshold at 31/1710 UTC, peaked at 666 pfu at 01/0915 UTC and was still in progress as of this writing.
The greater than 2 MeV electron flux at geosynchronous orbit was at high levels on 26, 29-31 May and 01 Jun with a maximum flux of 9,160 pfu reached at 31/1620 UTC. Normal to moderate levels occured on 27-28 May.
Geomagnetic field activity was at quiet to severe (G4-Severe) storm levels during the period. Unsettled to active levels were observed on 26-28 May due to negative polarity CH HSS influence. Minor (G1) to Strong (G3) storm conditions were observed on 29 May due to CIR effects in advance of a new negative polarity CH HSS. Quiet to isolated G1 (Minor) readings were observed on 30-31 May under continued negative polarity CH HSS influence. On 01 Jun, activity increased to G4 (Severe) storm levels as CME effects from the early 31 May flare reached Earth. During the 01 Jun activity, Bt reached 27 nT, Bz reached as far south as -24 nT and wind speeds exceeded 1100 km/s.
Forecast of Solar and Geomagnetic Activity 02 June - 28 June 2025
Solar activity is likely to reach moderate levels
(R1-R2/Minor-Moderate), with a chance for R3 (Strong), through 06 Jun as Region 4100 makes it to the west limb. A chance for M-class (R1-R2) X-ray activity will persist throughout the outlook period due to multiple regions on the visible as well as multiple active regions scheduled to return from the farside of the Sun.
The current proton event in progress is expected to end on 02 Jun with no additional events expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at high levels on 03-05, 14-22 and 26-28 Jun 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 mostly elevated levels due to anticipated influence from miltiple, recurrent coronal holes. G1 (Minor) to G2 (Moderate) geomagnetic storms are likely on 02-03 Jun due to waning CME effects. Unsettled to active conditions are likely on 04-07 and 10-12 Jun due to recurrent negative polarity CH HSS influence. Unsettled to G1 (Minor) conditions are likely on 13-22 Jun due to positive polarity CH HSS influence. Unsettled to G1 (Minor) conditions are likely on 23-28 Jun due to negative polarity CH HSS influence.
Product: 27-day Space Weather Outlook Table 27DO.txt
:Issued: 2025 Jun 02 0216 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact www.swpc.noaa.gov/content/subscription-services
#
# 27-day Space Weather Outlook Table
# Issued 2025-06-02
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2025 Jun 02 150 85 8
2025 Jun 03 150 35 5
2025 Jun 04 150 18 4
2025 Jun 05 150 20 4
2025 Jun 06 155 15 3
2025 Jun 07 155 10 3
2025 Jun 08 155 8 3
2025 Jun 09 155 5 2
2025 Jun 10 155 15 4
2025 Jun 11 150 12 4
2025 Jun 12 150 10 3
2025 Jun 13 155 35 6
2025 Jun 14 155 25 5
2025 Jun 15 155 18 4
2025 Jun 16 160 15 4
2025 Jun 17 160 12 4
2025 Jun 18 155 10 3
2025 Jun 19 155 8 3
2025 Jun 20 160 8 3
2025 Jun 21 155 8 3
2025 Jun 22 150 8 3
2025 Jun 23 145 12 4
2025 Jun 24 140 15 4
2025 Jun 25 140 35 6
2025 Jun 26 130 25 5
2025 Jun 27 130 12 4
2025 Jun 28 125 8 3
(NOAA)
