Space Weather Prediction Center bot

Product: Forecast Discussion Issued: 2026 Jun 09 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity remained at low levels with the two largest flares of the day originating from Region 4465 (N11E70, Dao/beta): a C7.2 at 08/0249 UTC and a C4.5/Sf at 08/0510 UTC. There are eight active regions on disk, most of them remained stable or showed some decay in area. Region 4464 (S12E24, Dac/beta-gamma) became more complex magnetically, gained additional intermediary spots during the period, and was the source of a C1.2 at 08/1733 UTC. No new Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... Isolated M-class flares are likely, with a slight chance for X-class flares, through 11 June primarily due to the flare potential exhibited by Regions 4456 (N17W61, Dai/beta), 4462 (N15W07, Dsi/beta), 4464 and 4465. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit reached high levels with a peak flux of 1,310 pfu at 08/1340 UTC. The greater than 10 MeV proton flux remained at background levels during the period. .Forecast... The greater than 2 MeV electron flux levels at geosynchronous orbit are likely to continue reaching high levels through 10 June, returning to moderate-low levels on 11 June. The greater than 10 MeV proton flux is expected to remain at background levels through 11 June. Solar Wind .24 hr Summary... Solar wind parameters suggested a glancing blow from the 06 June CME that was anticipated to arrive during the period. Solar wind speeds decreased from about 600 km/s to below 450 km/s, while the total Interplanetary Magnetic Field (IMF) strength showed a slight oscillation around 5nT. All the 3 components of the IMF vector became negative between 08/0300 UTC and 08/1400 UTC, with Bz reaching as south as -4 nT around 08/0919 UTC. The Phi angle remained mostly in the positive sector during the day. .Forecast... Analysis of the solar wind parameters, along with the suprathermal ions and electrons data from instruments at L1, suggested that the 06 June CME glancing passage near Earth already occurred on 08 June, reducing our confidence in further impacts on the next days. Therefore, background solar wind is expected until 11 June, when a -CH HSS is anticipated to become geoeffective. Geospace .24 hr Summary... Geomagnetic field activity was at quiet to unsettled levels during the past 24h. .Forecast... The geomagnetic field is expected to be at quiet to active levels on 09 June, quiet to unsettled levels on 10 Jun, and active levels on 11 June (due to anticipated -CH HSS effects).

Product: 3-Day Forecast Issued: 2026 Jun 09 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 09-Jun 11 2026 is 4.33 (below NOAA Scale levels). NOAA Kp index breakdown Jun 09-Jun 11 2026 Jun 09 Jun 10 Jun 11 00-03UT 4.33 3.00 2.00 03-06UT 4.00 3.33 2.00 06-09UT 3.00 2.33 3.00 09-12UT 3.33 2.00 2.67 12-15UT 2.33 2.00 3.00 15-18UT 1.67 2.00 3.33 18-21UT 3.00 2.33 3.00 21-00UT 2.67 2.33 4.00 Rationale: No G1 (Minor) or greater geomagnetic storms are expected. No significant transient or recurrent solar wind features are forecast. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 09-Jun 11 2026 Jun 09 Jun 10 Jun 11 S1 or greater 10% 10% 10% Rationale: No S1 (Minor) or greater solar radiation storms are expected. No significant active region activity favorable for radiation storm production is forecast. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 09-Jun 11 2026 Jun 09 Jun 10 Jun 11 R1-R2 55% 55% 55% R3 or greater 10% 10% 10% Rationale: Isolated R1/R2 (Minor/Moderate) radio blackouts are likely, with a slight chance for isolated R3 (Strong) events through 11 June, primarily due to the flare potential exhibited by Regions 4456 (N17W61, Dai/beta), 4462 (N15W07, Dsi/beta), 4464 and 4465.

:Product: NOAA 3-day Geomagnetic Forecasts :Issued: 2026 Jun 08 2200 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # NOAA Ap Index Forecast Observed Ap 07 Jun 008 Estimated Ap 08 Jun 009 Predicted Ap 09 Jun-11 Jun 017-010-015 NOAA Geomagnetic Activity Probabilities 09 Jun-11 Jun Active 45/35/40 Minor storm 15/10/10 Moderate storm 01/01/01 Strong-Extreme storm 01/01/01 NOAA Kp index forecast 09 Jun - 11 Jun Jun 09 Jun 10 Jun 11 00-03UT 4.33 3.00 2.00 03-06UT 4.00 3.33 2.00 06-09UT 3.00 2.33 3.00 09-12UT 3.33 2.00 2.67 12-15UT 2.33 2.00 3.00 15-18UT 1.67 2.00 3.33 18-21UT 3.00 2.33 3.00 21-00UT 2.67 2.33 4.00

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 159 Issued at 2200Z on 08 Jun 2026 IA. Analysis of Solar Active Regions and Activity from 07/2100Z to 08/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 8 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (09 Jun, 10 Jun, 11 Jun). IIA. Geophysical Activity Summary 07/2100Z to 08/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 585 km/s at 07/2110Z. Total IMF reached 5 nT at 07/2100Z. The maximum southward component of Bz reached -4 nT at 08/1807Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1,610 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and three (09 Jun, 11 Jun) and quiet to unsettled levels on day two (10 Jun). Protons have a slight chance of crossing threshold on days one, two, and three (09 Jun, 10 Jun, 11 Jun). III. Event probabilities 09 Jun-11 Jun Class M 55/55/55 Class X 10/10/10 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 08 Jun 131 Predicted 09 Jun-11 Jun 132/130/130 90 Day Mean 08 Jun 125 V. Geomagnetic A Indices Observed Afr/Ap 07 Jun 008/008 Estimated Afr/Ap 08 Jun 016/023 Predicted Afr/Ap 09 Jun-11 Jun 014/017-009/010-012/015 VI. Geomagnetic Activity Probabilities 09 Jun-11 Jun A. Middle Latitudes Active 35/30/30 Minor Storm 10/05/05 Major-severe storm 01/01/01 B. High Latitudes Active 15/15/15 Minor Storm 30/30/30 Major-severe storm 45/35/35

Space Weather Message Code: WATA50 Serial Number: 100 Issue Time: 2026 Jun 08 2117 UTC CANCELLED WATCH: Geomagnetic Storm Category G3 Predicted Cancel Serial Number: 99 Original Issued Time: 2026 Jun 06 2211 UTC Due to current conditions no longer reflecting CME influence, the G3 Watch for 08 Jun and the G2 Watch for 09 Jun are cancelled. Due to current conditions no longer reflecting CME influence, the G3 Watch for 08 Jun and the G2 Watch for 09 Jun are cancelled.

Product: 3-Day Forecast Issued: 2026 Jun 08 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 08-Jun 10 2026 is 6.67 (NOAA Scale G3). NOAA Kp index breakdown Jun 08-Jun 10 2026 Jun 08 Jun 09 Jun 10 00-03UT 2.33 5.67 (G2) 3.67 03-06UT 2.33 5.33 (G1) 3.33 06-09UT 2.67 4.33 2.33 09-12UT 3.00 3.33 2.00 12-15UT 5.67 (G2) 3.00 2.00 15-18UT 6.67 (G3) 3.33 2.00 18-21UT 5.33 (G1) 3.67 2.67 21-00UT 5.67 (G2) 4.00 2.67 Rationale: Periods of G1-G3 (Minor-Strong) geomagnetic storming are likely on 08 Jun, with G1-G2 (Minor-Moderate) levels likely on 09 Jun, due to the anticipated passage of a CME that left the Sun on 06 Jun. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 08-Jun 10 2026 Jun 08 Jun 09 Jun 10 S1 or greater 25% 5% 5% Rationale: There is a chance for the greater than 10 MeV proton flux to reach S1 (Minor) levels on 08 June with the shock arrival of the 06 June CME. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 08-Jun 10 2026 Jun 08 Jun 09 Jun 10 R1-R2 55% 55% 55% R3 or greater 10% 10% 10% Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a slight chance for an R3 (Strong) or greater event, over 08-10 Jun.

Product: Forecast Discussion Issued: 2026 Jun 08 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity returned to low levels with mostly lower level C-class flare activity. Region 4455 (N15W82, Hsx/alpha) underwent decay and remained relatively quiet. Region 4456 (N17W55, Dai/beta) underwent minor decay as well. Regions 4462 (N15W02, Dsi/beta) and 4464 (S12E31, Dai/beta) experienced growth as they gained additional spots and tacked on C-class flares as well. New Region 4465 (N11E80, Dao/beta) was numbered this period and produced the largest flare, a C7.2 at 08/0249 UTC. No new Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... A chance for isolated M-class flare activity (55%) will persist through 10 June primarily due to the flare potential exhibited by Regions 4456, 4458 (S05W69, Dso/beta), 4462 and 4465 alongside the flare history of Region 4455. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit reached high levels with a peak flux of 2,874 pfu at 07/1540 UTC. The greater than 10 MeV proton flux remained slightly enhanced due to the eruption from the M1.8 flare event on 06 June, but was well below the S1 (Minor) radiation storm threshold. .Forecast... The greater than 2 MeV electron flux at geosynchronous orbit is expected to return to normal to moderate levels on 08 June with the arrival of the 06 June CME. 2 MeV electron flux levels are likely to return to high levels by the close of 09 June and continue at high levels through 10 June. The greater than 10 MeV proton flux is expected to remain at background levels with a chance for an S1 (Minor) event on 08 June with the shock arrival of the 06 June CME. Solar Wind .24 hr Summary... Solar wind parameters reflected positive polarity CH HSS influences. Total field primarily ranged 4-5 nT and the Bz component was +/- 4 nT. Solar wind speeds peaked at approximately 589 km/s, but overall gradually declined to about 475 km/s. .Forecast... A disturbed and enhanced solar wind environment is expected by early to mid UTC-day on 08 June with the shock arrival from the 06 June CME bringing enhanced magnetic field and faster solar wind. These enhancements are anticipated to continue into 09 June before gradually diminishing through 10 June. Geospace .24 hr Summary... Geomagnetic field activity was at quiet to unsettled levels. .Forecast... G1-G2 (Minor-Moderate) geomagnetic storming are likely to begin by mid UTC-day on 08 June with the arrival of the CME that left the Sun on 06 June. G3 (Strong) geomagnetic storming is likely during the latter half of 08 June, but this outcome is dependent upon how much the CME has expanded into the Sun-Earth line as the model indicates a bulk of the material to be mostly south and east of Earth. G1-G2 (Minor-Moderate) geomagnetic storming is likely to linger into the early portions of 09 June before giving way to unsettled to active conditions that carry into 10 June.

The latest version of "The Weekly" Preliminary Report and Forecast of Solar Geophysical Data is now posted on-line and available at http://www.swpc.noaa.gov/products/weekly-highlights-and-27-day-forecast

Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #26-22 2026 June 7 at 8:52 p.m. MDT (2026 June 8 0252 UTC) **** SPACE WEATHER OUTLOOK **** Summary For June 1-7 -An R3 (Strong) event was observed at 03/1128 UTC. -R2 (Moderate) events were observed at 03/0136 and 03/0700 UTC. -R1 (Minor) events were observed at 02/0445, 02/1005, 02/1650, and 06/1401 UTC. -G2 (Moderate) storming was observed on 05 Jun due to CME activity. -G1 (Minor) storming was observed on 05-06 Jun. -No solar radiation storm events were observed this period. Outlook For June 8-14 -G1-G3 (Minor-Strong) geomagnetic storms are likely on 08 Jun due to CME influences. -G1-G2 (Minor-Moderate) storming is likely on 09 Jun as CME influences wane. -R1-R2 (Minor-Moderate) events are likely through 14 Jul. Data used to provide space weather services are contributed by NOAA, USAF, NASA, NSF, USGS, the International Space Environment Services and other observatories, universities, and institutions. More information is available at SWPC's Web site http://swpc.noaa.gov

Product: 3-Day Forecast Issued: 2026 Jun 08 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 08-Jun 10 2026 is 6.67 (NOAA Scale G3). NOAA Kp index breakdown Jun 08-Jun 10 2026 Jun 08 Jun 09 Jun 10 00-03UT 2.33 5.67 (G2) 3.67 03-06UT 2.00 5.33 (G1) 3.33 06-09UT 4.33 4.33 2.33 09-12UT 5.00 (G1) 3.33 2.00 12-15UT 5.67 (G2) 3.00 2.00 15-18UT 6.67 (G3) 3.33 2.00 18-21UT 5.33 (G1) 3.67 2.67 21-00UT 5.67 (G2) 4.00 2.67 Rationale: Periods of G1-G3 (Minor-Strong) geomagnetic storming are likely on 08 Jun, with G1-G2 (Minor-Moderate) levels likely on 09 Jun, due to the anticipated passage of a CME that left the Sun on 06 Jun. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 08-Jun 10 2026 Jun 08 Jun 09 Jun 10 S1 or greater 25% 5% 5% Rationale: There is a chance for the greater than 10 MeV proton flux to reach S1 (Minor) levels on 08 June with the shock arrival of the 06 June CME. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 08-Jun 10 2026 Jun 08 Jun 09 Jun 10 R1-R2 55% 55% 55% R3 or greater 10% 10% 10% Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a slight chance for an R3 (Strong) or greater event, over 08-10 Jun.

Product: Forecast Discussion Issued: 2026 Jun 08 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity returned to low levels with only lower level C-class flare activity. Region 4455 (N15W75, Hsx/alpha) underwent decay and remained relatively quiet. Region 4456 (N17W48, Dai/beta-gamma) underwent minor decay as well and produced a C3.3 flare at 07/0419 UTC, which was the largest of the period. Regions 4462 (N15E05, Dsi/beta) and 4464 (S12E38, Dai/beta) experienced growth as they gained additional spots and tacked on C-class flares as well. No new Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... A chance for isolated M-class flare activity (55%) will persist through 10 June primarily due to the flare potential exhibited by Regions 4456, 4458 and 4462 alongside the flare history of Region 4455. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit reached high levels with a peak flux of 2,870 pfu at 07/1540 UTC. The greater than 10 MeV proton flux remained slightly enhanced due to the eruption from the M1.8 flare event on 06 June, but was well below the S1 (Minor) radiation storm threshold .Forecast... The greater than 2 MeV electron flux at geosynchronous orbit is expected to return to normal to moderate levels on 08 June with the arrival of the 06 June CME. 2 MeV electron flux levels are likely to return to high levels by the close of 09 June and continue at high levels through 10 June. The greater than 10 MeV proton flux is expected to remain at background levels with a chance for an S1 (Minor) event on 08 June with the shock arrival of the 06 June CME. Solar Wind .24 hr Summary... Solar wind parameters reflected positive polarity CH HSS influences. Total field primarily ranged 4-5 nT and the Bz component was +/- 4 nT. Solar wind speeds peaked at approximately 589 km/s, but overall gradually declined to under 550 km/s. .Forecast... A disturbed and enhanced solar wind environment is expected by early to mid UTC-day on 08 June with the shock arrival from the 06 June CME bringing enhanced magnetic field and faster solar wind. These enhancements are anticipated to continue into 09 June before gradually diminishing through 10 June. Geospace .24 hr Summary... Geomagnetic field activity was at quiet to unsettled levels. .Forecast... G1-G2 (Minor-Moderate) geomagnetic storming are likely to begin by mid UTC-day on 08 June with the arrival of the CME that left the Sun on 06 June. G3 (Strong) geomagnetic storming is likely during the latter half of 08 June, but this outcome is dependent upon how much the CME has expanded into the Sun-Earth line as the model indicates a bulk of the material to be mostly south and east of Earth. G1-G2 (Minor-Moderate) geomagnetic storming is likely to linger into the early portions of 09 June before giving way to unsettled to active conditions that carry into 10 June.

:Product: NOAA 3-day Geomagnetic Forecasts :Issued: 2026 Jun 07 2200 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # NOAA Ap Index Forecast Observed Ap 06 Jun 017 Estimated Ap 07 Jun 008 Predicted Ap 08 Jun-10 Jun 050-032-012 NOAA Geomagnetic Activity Probabilities 08 Jun-10 Jun Active 04/10/40 Minor storm 15/20/15 Moderate storm 30/40/01 Strong-Extreme storm 51/25/01 NOAA Kp index forecast 08 Jun - 10 Jun Jun 08 Jun 09 Jun 10 00-03UT 2.33 5.67 3.67 03-06UT 2.00 5.33 3.33 06-09UT 4.33 4.33 2.33 09-12UT 5.00 3.33 2.00 12-15UT 5.67 3.00 2.00 15-18UT 6.67 3.33 2.00 18-21UT 5.33 3.67 2.67 21-00UT 5.67 4.00 2.67

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 158 Issued at 2200Z on 07 Jun 2026 IA. Analysis of Solar Active Regions and Activity from 06/2100Z to 07/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 8 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is likely to be moderate with a slight chance for an X-class flare on days one, two, and three (08 Jun, 09 Jun, 10 Jun). IIA. Geophysical Activity Summary 06/2100Z to 07/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 631 km/s at 06/2250Z. Total IMF reached 5 nT at 07/1317Z. The maximum southward component of Bz reached -4 nT at 07/1341Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 2874 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to severe storm levels on day one (08 Jun), unsettled to major storm levels on day two (09 Jun) and quiet to active levels on day three (10 Jun). Protons greater than 10 Mev have a chance of crossing threshold on day one (08 Jun). III. Event probabilities 08 Jun-10 Jun Class M 55/55/55 Class X 10/10/10 Proton 25/05/05 PCAF green IV. Penticton 10.7 cm Flux Observed 07 Jun 134 Predicted 08 Jun-10 Jun 135/132/130 90 Day Mean 07 Jun 125 V. Geomagnetic A Indices Observed Afr/Ap 06 Jun 019/017 Estimated Afr/Ap 07 Jun 008/009 Predicted Afr/Ap 08 Jun-10 Jun 030/050-025/032-009/012 VI. Geomagnetic Activity Probabilities 08 Jun-10 Jun A. Middle Latitudes Active 15/25/30 Minor Storm 35/35/10 Major-severe storm 50/30/01 B. High Latitudes Active 05/05/15 Minor Storm 10/15/30 Major-severe storm 85/79/40

Product: Forecast Discussion Issued: 2026 Jun 07 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity reached moderate levels due to an M1.8/2n flare at 06/1401 UTC from Region 4461 (S21E12, Cro/beta), which was the largest of the period. Region 4456 (N17W41, Dai/beta-gamma-delta) was responsible for a C8.8/Sf flare at 06/1318 UTC as it continued to undergo evolution, gaining additional spots with asymmetric penumbra and a relatively weak delta signature in its intermediate area. Low-level C-class flares were observed just behind the E limb at about at about N06. The aforementioned M1.9/2N flare resulted in a F10.7 cm radio burst measuring 190 sfu, an approximately 11 degree-long filament eruption centered near S25E28, and a Type II sweep with an estimated speed of 838 km/s. The resulting partial halo CME, first seen in LASCO C2 coronagraph imagery at 06/1401 UTC, is anticipated to arrive around midday on 08 June. .Forecast... A chance for isolated M-class flare activity (55%) will persist through 09 June primarily due to the flare potential exhibited by Regions 4456, 4458 and 4462 alongside the flare history of Region 4455. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux at geosynchronous orbit reached high levels with a peak flux of 1,280 pfu at 06/1710 UTC. The greater than 10 MeV proton flux became enhanced just after 06/1515 UTC due to the eruption from the M1.8 flare event. .Forecast... The greater than 2 MeV electron flux at geosynchronous orbit is expected to remain at high levels through 07 June before returning to normal to moderate levels on 08 June with the arrival of the 06 June CME. 2 MeV electron flux levels are likely to return to high levels by the close of 09 June. The greater than 10 MeV proton flux is expected to remain at background levels with a chance for an S1 (Minor) event on 08 June with the shock arrival of the 06 June CME. Solar Wind .24 hr Summary... Solar wind parameters reflected waning CME and possible weak positive polarity CH HSS influences. Total field ranged 3-5 nT and the Bz component was mostly benign with no significant southward deflections. Solar wind speeds gradually declined to primarily below 550 km/s and phi was predominantly positive. .Forecast... Current solar wind conditions are expected to continue to wane over the course of 07 June. A disturbed solar wind environment is expected to return by early to mid UTC-day on 08 June with the shock arrival from the 06 June CME bringing enhanced magnetic field and faster solar wind. These enhancements are anticipated to continue into 09 June with a waning trend beginning by mid UTC-day. Geospace .24 hr Summary... Geomagnetic field activity was at quiet to unsettled levels. .Forecast... Quiet to unsettled levels are expected on 07 June under the current solar wind regime. G1-G2 (Minor-Moderate), with isolated periods of G3 (Strong), geomagnetic storming are likely to begin by mid UTC-day on 08 June with the arrival of the CME that left the Sun on 06 June. G1-G2 (Minor-Moderate) geomagnetic storming is likely to linger into the early portions of 09 June before giving way to unsettled to active conditions.

Product: 3-Day Forecast Issued: 2026 Jun 07 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 3 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 07-Jun 09 2026 is 7.00 (NOAA Scale G3). NOAA Kp index breakdown Jun 07-Jun 09 2026 Jun 07 Jun 08 Jun 09 00-03UT 2.67 2.33 6.33 (G2) 03-06UT 2.00 2.00 5.33 (G1) 06-09UT 2.00 3.00 5.00 (G1) 09-12UT 2.67 4.33 4.33 12-15UT 2.00 5.33 (G1) 3.00 15-18UT 2.00 5.67 (G2) 3.33 18-21UT 2.33 7.00 (G3) 3.33 21-00UT 2.33 6.33 (G2) 3.67 Rationale: Periods of G1-G3 (Minor-Strong) geomagnetic storming are likely on 08 Jun, with G1-G2 (Minor-Moderate) storm periods likely on 09 Jun, following the anticipated arrival of a CME that left the Sun on 06 Jun. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 07-Jun 09 2026 Jun 07 Jun 08 Jun 09 S1 or greater 15% 25% 10% Rationale: There is a slight chance for S1 (Minor) solar radiation storms on 07 and 09 Jun, with a chance for S1 levels on 08 Jun following the anticipated shock arrival of the 06 June CME. C. NOAA Radio Blackout Activity and Forecast Radio blackouts reaching the R1 levels were observed over the past 24 hours. The largest was at Jun 06 2026 1401 UTC. Radio Blackout Forecast for Jun 07-Jun 09 2026 Jun 07 Jun 08 Jun 09 R1-R2 55% 55% 55% R3 or greater 10% 10% 10% Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a slight chance for R3 (Strong) or greater events, over 07-09 Jun.

Product: 3-Day Forecast Issued: 2026 Jun 07 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center A. NOAA Geomagnetic Activity Observation and Forecast The greatest observed 3 hr Kp over the past 24 hours was 4 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 07-Jun 09 2026 is 7.00 (NOAA Scale G3). NOAA Kp index breakdown Jun 07-Jun 09 2026 Jun 07 Jun 08 Jun 09 00-03UT 3.00 2.33 6.33 (G2) 03-06UT 2.67 2.00 5.33 (G1) 06-09UT 2.67 3.00 5.00 (G1) 09-12UT 2.00 4.33 4.33 12-15UT 2.00 5.33 (G1) 3.00 15-18UT 2.00 5.67 (G2) 3.33 18-21UT 2.33 7.00 (G3) 3.33 21-00UT 2.33 6.33 (G2) 3.67 Rationale: Periods of G1-G3 (Minor-Strong) geomagnetic storming are likely on 08 Jun, with G1-G2 (Minor-Moderate) storm periods likely on 09 Jun, following the anticipated arrival of a CME that left the Sun on 06 Jun. B. NOAA Solar Radiation Activity Observation and Forecast Solar radiation, as observed by NOAA GOES-18 over the past 24 hours, was below S-scale storm level thresholds. Solar Radiation Storm Forecast for Jun 07-Jun 09 2026 Jun 07 Jun 08 Jun 09 S1 or greater 15% 25% 10% Rationale: There is a slight chance for S1 (Minor) solar radiation storms on 07 and 09 Jun, with a chance for S1 levels on 08 Jun following the anticipated shock arrival of the 06 June CME. C. NOAA Radio Blackout Activity and Forecast Radio blackouts reaching the R1 levels were observed over the past 24 hours. The largest was at Jun 06 2026 1401 UTC. Radio Blackout Forecast for Jun 07-Jun 09 2026 Jun 07 Jun 08 Jun 09 R1-R2 55% 55% 55% R3 or greater 10% 10% 10% Rationale: R1-R2 (Minor-Moderate) radio blackouts are likely, with a slight chance for R3 (Strong) or greater events, over 07-09 Jun.