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Forecast Discussion

Product: Forecast Discussion Issued: 2025 Jun 24 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity was at low levels. Region 4115 (N21W80, Hsx/alpha) produced a C5.0 flare at 23/1223 UTC, which was the largest event of the period. Regions 4117 (S13W03, Dsi/beta) and 4118 (S12E08, Dai/beta-gamma) remained the largest spot groups on the visible disk with the latter developing a weak gamma configuration. Regions 4119 (S26W03, Bxo/beta), 4120 (N06E04, Bxo/beta) and 4121 (S12E25, Bxo/beta) all emerged relatively rapidly this period, were numbered, but were otherwise unremarkable. New, simple spots were also noted near N16E54, but remain unnumbered at this time given a lack of development. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... A chance for R1-R2 (Minor-Moderate) radio blackouts, with a slight chance for X-class flares (R3-Strong), will persist through 26 June. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux reached high levels with a peak flux of 1,270 pfu at 23/1520 UTC. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is expected to reach moderate levels through 26 June with a chance for high levels on 24 June. There remains a slight chance for the greater than 10 MeV protons to become elevated through 26 June primarily due to the eruptive potential of Regions 4114 and 4115 as they transit the western limb followed by Regions 4117 and 4118 rotating into a favorable geoeffective location. Solar Wind .24 hr Summary... Solar wind parameters continued to reflect a positive polarity CH HSS regime. Total field ranged 3-7 nT and the Bz component was +/- 5 nT. Solar wind speeds gradually decreased from ~500 km/s to near 400 km/s over the course of the period. Phi was predominantly in the positive solar sector. .Forecast... Gradually waning positive polarity CH HSS influence is expected to continue on 24 June. An enhanced solar wind regime is expected to return on 25 June and continue into 26 June due to recurrent, negative polarity CH HSS onset. Geospace .24 hr Summary... The geomagnetic field was at quiet to unsettled levels. .Forecast... The geomagnetic field is expected to be at quiet to active levels on 24 June under diminishing positive polarity CH HSS effects. G1-G2 (Minor-Moderate) geomagnetic storming is likely 25-26 June due to recurrent, negative polarity CH HSS effects.

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NOAA 3-Day Forecast

Product: 3-Day Forecast Issued: 2025 Jun 24 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 24-Jun 26 2025 is 5.67 (NOAA Scale G2). NOAA Kp index breakdown Jun 24-Jun 26 2025 Jun 24 Jun 25 Jun 26 00-03UT 3.00 3.00 5.00 (G1) 03-06UT 3.67 4.33 4.67 (G1) 06-09UT 2.00 5.33 (G1) 4.67 (G1) 09-12UT 2.67 5.67 (G2) 3.67 12-15UT 2.67 5.00 (G1) 3.00 15-18UT 2.67 4.00 3.00 18-21UT 2.67 4.00 3.33 21-00UT 2.00 5.00 (G1) 4.00 Rationale: G1-G2 (Minor-Moderate) geomagnetic storming is likely 25-26 June due to recurrent, negative polarity CH HSS effects. 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 24-Jun 26 2025 Jun 24 Jun 25 Jun 26 S1 or greater 10% 10% 10% Rationale: There is a slight chance for an S1 (Minor) solar radiation storm on 24-26 Jun. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 24-Jun 26 2025 Jun 24 Jun 25 Jun 26 R1-R2 35% 35% 35% R3 or greater 10% 10% 10% Rationale: A chance for R1-R2 (Minor-Moderate) radio blackouts, with a slight chance for X-class flares (R3-Strong), will persist through 26 June.

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NOAA Geomagnetic Forecast

:Product: NOAA 3-day Geomagnetic Forecasts :Issued: 2025 Jun 23 2200 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # NOAA Ap Index Forecast Observed Ap 22 Jun 009 Estimated Ap 23 Jun 010 Predicted Ap 24 Jun-26 Jun 012-040-028 NOAA Geomagnetic Activity Probabilities 24 Jun-26 Jun Active 40/20/25 Minor storm 15/25/30 Moderate storm 01/40/15 Strong-Extreme storm 01/15/05 NOAA Kp index forecast 24 Jun - 26 Jun Jun 24 Jun 25 Jun 26 00-03UT 3.00 3.00 5.00 03-06UT 3.67 4.33 4.67 06-09UT 2.00 5.33 4.67 09-12UT 2.67 5.67 3.67 12-15UT 2.67 5.00 3.00 15-18UT 2.67 4.00 3.00 18-21UT 2.67 4.00 3.33 21-00UT 2.00 5.00 4.00

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Report of Solar Geophysical Activity (RSGA)

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 174 Issued at 2200Z on 23 Jun 2025 IA. Analysis of Solar Active Regions and Activity from 22/2100Z to 23/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 7 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares and a slight chance for an X-class flare on days one, two, and three (24 Jun, 25 Jun, 26 Jun). IIA. Geophysical Activity Summary 22/2100Z to 23/2100Z: The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 530 km/s at 22/2358Z. Total IMF reached 6 nT at 23/0039Z. The maximum southward component of Bz reached -5 nT at 23/0010Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 1271 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on day one (24 Jun), unsettled to major storm levels on day two (25 Jun) and unsettled to minor storm levels on day three (26 Jun). Protons have a slight chance of crossing threshold on days one, two, and three (24 Jun, 25 Jun, 26 Jun). III. Event probabilities 24 Jun-26 Jun Class M 35/35/35 Class X 10/10/10 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 23 Jun 122 Predicted 24 Jun-26 Jun 120/120/125 90 Day Mean 23 Jun 146 V. Geomagnetic A Indices Observed Afr/Ap 22 Jun 009/ 008 Estimated Afr/Ap 23 Jun 010/011 Predicted Afr/Ap 24 Jun-26 Jun 010/012-028/040-021/028 VI. Geomagnetic Activity Probabilities 24 Jun-26 Jun A. Middle Latitudes Active 30/30/35 Minor Storm 10/35/25 Major-severe storm 01/25/05 B. High Latitudes Active 15/05/10 Minor Storm 25/20/25 Major-severe storm 40/80/55

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WATCH: Geomagnetic Storm Category G2 Predicted

Space Weather Message Code: WATA30 Serial Number: 254 Issue Time: 2025 Jun 23 1700 UTC WATCH: Geomagnetic Storm Category G2 Predicted Highest Storm Level Predicted by Day: Jun 24: None (Below G1) Jun 25: G2 (Moderate) Jun 26: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT Comment: Recurrent, negative polarity coronal hole high speed stream influence is likely to bring minor to moderate geomagnetic storming 25-26 Jun. NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude. Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms. Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible. Radio - HF (high frequency) radio propagation can fade at higher latitudes. Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.

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Forecast Discussion

Product: Forecast Discussion Issued: 2025 Jun 23 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity was at low levels due to numerous weak C-class flares from Regions 4114 (N21W83, Hsx/alpha) and 4118 (S12E15, Dai/beta). Region 4118 showed some slight trailer spot growth. The remaining spotted regions on the visible disk were either stable or in gradual decay. Other activity included a CME that was observed lifting off the NW quadrant in the vicinity of Region 4115 (N21W73, Cso/beta) at around 22/1348 UTC. Analysis and modeling of this event indicated no Earth-directed component. .Forecast... There exists a chance for R1-R2 (Minor-Moderate) radio blackouts, with a slight chance for X-class flares (R3-Strong), over 23-25 June. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux was at low to moderate levels. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is likely to continue at low to moderate levels over 23-25 Jun. There remains a slight chance for the greater than 10 MeV protons to become elevated over 23-25 Jun due to eruptive potential from multiple regions on the visible disk. Solar Wind .24 hr Summary... Solar wind parameters continued to reflect a positive polarity CH HSS regime. Total magnetic field strength was between 5-6 nT. The Bz component reached as far south as -5 nT. Solar wind speeds varied from ~425-500 km/s. Phi angle was predominantly oriented in the positive sector. .Forecast... Elevated solar wind parameters from the influence of multiple, recurrent coronal holes is expected over 23-25 Jun. Geospace .24 hr Summary... The geomagnetic field was at quiet to unsettled levels. .Forecast... The geomagnetic field is likely to reach isolated periods of active conditions over 23-24 Jun, and G1 (Minor) geomagnetic storm periods are likely on 25 Jun, due to coronal hole effects.

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NOAA 3-Day Forecast

Product: 3-Day Forecast Issued: 2025 Jun 23 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 23-Jun 25 2025 is 4.67 (NOAA Scale G1). NOAA Kp index breakdown Jun 23-Jun 25 2025 Jun 23 Jun 24 Jun 25 00-03UT 3.00 3.00 4.67 (G1) 03-06UT 1.67 3.67 4.67 (G1) 06-09UT 1.33 2.00 4.00 09-12UT 2.67 2.67 4.00 12-15UT 3.67 2.67 4.67 (G1) 15-18UT 2.67 2.67 4.67 (G1) 18-21UT 2.67 2.67 4.67 (G1) 21-00UT 3.00 2.00 4.00 Rationale: Periods of G1 (Minor) geomagnetic storms are likely on 25 Jun due to the onset of negative polarity CH HSS influences. 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 23-Jun 25 2025 Jun 23 Jun 24 Jun 25 S1 or greater 10% 10% 10% Rationale: There is a slight chance for S1 (Minor) solar radiation storms over 23-25 Jun due to eruptive potential from multiple regions on the visible disk. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 23-Jun 25 2025 Jun 23 Jun 24 Jun 25 R1-R2 45% 45% 45% R3 or greater 10% 10% 10% Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts, and a slight chance for R3 (Strong) or greater events, over 23-25 Jun.

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Preliminary Report and Forecast of Solar Geophysical Data (The Weekly)

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

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Space Weather Outlook

Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA SPACE WEATHER ADVISORY OUTLOOK #25-21 2025 June 22 at 6:52 p.m. MDT (2025 June 23 0052 UTC) **** SPACE WEATHER OUTLOOK **** Summary For June 16-22 -R3 (Strong) radio blackouts were observed on 17 and 19 Jun. -An R2 (Moderate) event was observed on 16 Jun. -R1 (Minor) events were observed on 16-17 and 20 Jun. -No geomagnetic or solar radiation storms were observed this period. Outlook For June 23-29 -There is a chance for R1-R2 (Minor-Moderate) events through 29 Jun. -There is a slight chance for an R3 (Strong) or greater event through 29 Jun. -Periods of G1 (Minor) geomagnetic storms are likely on 25-26 Jun due to +CH HSS influences. -There is a slight chance for S1 (Minor) solar radiation storm conditions through 29 Jun. 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

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NOAA 3-Day Forecast

Product: 3-Day Forecast Issued: 2025 Jun 23 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 23-Jun 25 2025 is 4.67 (NOAA Scale G1). NOAA Kp index breakdown Jun 23-Jun 25 2025 Jun 23 Jun 24 Jun 25 00-03UT 2.67 3.00 4.67 (G1) 03-06UT 2.00 3.67 4.67 (G1) 06-09UT 2.00 2.00 4.00 09-12UT 2.67 2.67 4.00 12-15UT 3.67 2.67 4.67 (G1) 15-18UT 2.67 2.67 4.67 (G1) 18-21UT 2.67 2.67 4.67 (G1) 21-00UT 3.00 2.00 4.00 Rationale: Periods of G1 (Minor) geomagnetic storms are likely on 25 Jun due to the onset of negative polarity CH HSS influences. 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 23-Jun 25 2025 Jun 23 Jun 24 Jun 25 S1 or greater 10% 10% 10% Rationale: There is a slight chance for S1 (Minor) solar radiation storms over 23-25 Jun due to eruptive potential from multiple regions on the visible disk. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 23-Jun 25 2025 Jun 23 Jun 24 Jun 25 R1-R2 45% 45% 45% R3 or greater 10% 10% 10% Rationale: There is a chance for R1-R2 (Minor-Moderate) radio blackouts, and a slight chance for R3 (Strong) or greater events, over 23-25 Jun.

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Forecast Discussion

Product: Forecast Discussion Issued: 2025 Jun 23 0030 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity was at low levels. A C1.5 flare at 22/1741 UTC from beyond the W limb was the strongest event of the period. Some minor development was observed in Regions 4118 (S13E22, Dai/beta) and 4117 (S15E11, Dsi/beta). The remaining spotted regions on the visible disk were either stable or in gradual decay. Other activity included a CME that was observed lifting off the NW quadrant in the vicinity of Region 4115 (N22W66, Eso/beta) at around 22/1348 UTC. Analysis and modeling of the event is ongoing. .Forecast... There exists a chance for R1-R2 (Minor-Moderate) radio blackouts, with a slight chance for X-class flares (R3-Strong), over 23-25 June. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux was at low to moderate levels. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is likely to continue at low to moderate levels over 23-25 Jun. There remains a slight chance for the greater than 10 MeV protons to become elevated over 23-25 Jun due to eruptive potential from multiple regions on the visible disk. Solar Wind .24 hr Summary... Solar wind parameters continued to reflect a positive polarity CH HSS regime. Total magnetic field strength was between 3-6 nT. The Bz component reached as far south as -5 nT. Solar wind speeds varied from ~425-575 km/s. Phi angle was predominantly oriented in the positive sector. .Forecast... Elevated solar wind parameters from the influence of multiple, recurrent coronal holes is expected over 23-25 Jun. Geospace .24 hr Summary... The geomagnetic field was at quiet to active levels. .Forecast... The geomagnetic field is likely to reach isolated periods of active conditions over 23-24 Jun, and G1 (Minor) geomagnetic storm periods are likely on 25 Jun, due to coronal hole effects.

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NOAA Geomagnetic Forecast

:Product: NOAA 3-day Geomagnetic Forecasts :Issued: 2025 Jun 22 2200 UTC # Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center # NOAA Ap Index Forecast Observed Ap 21 Jun 012 Estimated Ap 22 Jun 010 Predicted Ap 23 Jun-25 Jun 012-012-035 NOAA Geomagnetic Activity Probabilities 23 Jun-25 Jun Active 40/40/25 Minor storm 15/15/35 Moderate storm 01/01/15 Strong-Extreme storm 01/01/05 NOAA Kp index forecast 23 Jun - 25 Jun Jun 23 Jun 24 Jun 25 00-03UT 2.67 3.00 4.67 03-06UT 2.00 3.67 4.67 06-09UT 2.00 2.00 4.00 09-12UT 2.67 2.67 4.00 12-15UT 3.67 2.67 4.67 15-18UT 2.67 2.67 4.67 18-21UT 2.67 2.67 4.67 21-00UT 3.00 2.00 4.00

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Report of Solar Geophysical Activity (RSGA)

Joint USAF/NOAA Solar Geophysical Activity Report and Forecast SDF Number 173 Issued at 2200Z on 22 Jun 2025 IA. Analysis of Solar Active Regions and Activity from 21/2100Z to 22/2100Z: Solar activity has been at low levels for the past 24 hours. There are currently 5 numbered sunspot regions on the disk. IB. Solar Activity Forecast: Solar activity is expected to be low with a chance for M-class flares and a slight chance for an X-class flare on days one, two, and three (23 Jun, 24 Jun, 25 Jun). IIA. Geophysical Activity Summary 21/2100Z to 22/2100Z: The geomagnetic field has been at quiet to active levels for the past 24 hours. Solar wind speed reached a peak of 626 km/s at 22/0059Z. Total IMF reached 7 nT at 21/2101Z. The maximum southward component of Bz reached -4 nT at 22/1637Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 686 pfu. IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be at quiet to active levels on days one and two (23 Jun, 24 Jun) and active to minor storm levels on day three (25 Jun). Protons have a slight chance of crossing threshold on days one, two, and three (23 Jun, 24 Jun, 25 Jun). III. Event probabilities 23 Jun-25 Jun Class M 45/45/45 Class X 10/10/10 Proton 10/10/10 PCAF green IV. Penticton 10.7 cm Flux Observed 22 Jun 125 Predicted 23 Jun-25 Jun 125/120/125 90 Day Mean 22 Jun 146 V. Geomagnetic A Indices Observed Afr/Ap 21 Jun 010/010 Estimated Afr/Ap 22 Jun 008/010 Predicted Afr/Ap 23 Jun-25 Jun 010/012-010/012-024/035 VI. Geomagnetic Activity Probabilities 23 Jun-25 Jun A. Middle Latitudes Active 30/30/35 Minor Storm 10/10/25 Major-severe storm 01/01/05 B. High Latitudes Active 15/15/10 Minor Storm 25/25/25 Major-severe storm 40/40/65

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WATCH: Geomagnetic Storm Category G1 Predicted

Space Weather Message Code: WATA20 Serial Number: 1048 Issue Time: 2025 Jun 22 2116 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jun 23: None (Below G1) Jun 24: None (Below G1) Jun 25: G1 (Minor) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Spacecraft - Minor impact on satellite operations possible. Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.

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NOAA 3-Day Forecast

Product: 3-Day Forecast Issued: 2025 Jun 22 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 4 (below NOAA Scale levels). The greatest expected 3 hr Kp for Jun 22-Jun 24 2025 is 3.67 (below NOAA Scale levels). NOAA Kp index breakdown Jun 22-Jun 24 2025 Jun 22 Jun 23 Jun 24 00-03UT 3.67 2.67 3.00 03-06UT 2.33 2.00 3.67 06-09UT 1.67 2.00 2.00 09-12UT 2.00 2.67 2.67 12-15UT 2.67 3.67 2.67 15-18UT 2.33 2.67 2.67 18-21UT 0.67 2.67 2.67 21-00UT 2.33 3.00 2.00 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 22-Jun 24 2025 Jun 22 Jun 23 Jun 24 S1 or greater 10% 10% 10% Rationale: There is a slight chance for S1 (Minor) solar radiation storms over 22-24 Jun. C. NOAA Radio Blackout Activity and Forecast No radio blackouts were observed over the past 24 hours. Radio Blackout Forecast for Jun 22-Jun 24 2025 Jun 22 Jun 23 Jun 24 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 22-24 Jun.

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Forecast Discussion

Product: Forecast Discussion Issued: 2025 Jun 22 1230 UTC Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center Solar Activity .24 hr Summary... Solar activity was at low levels. Region 4114 (N20W71, Eso/beta-gamma) produced an impulsive C1.3 flare at 22/0315 UTC. The region continued to decay as it headed towards the W limb. Region 4118 (S13E29, Cso/beta) produced an impulsive C1.0 flare at 22/0602 UTC. Regions 4115 (N22W59, Cso/beta), 4117 (S15E18, Dsi/beta) and 4118 all exhibited minor development. No Earth-directed CMEs were observed in available coronagraph imagery. .Forecast... R1-R2 (Minor-Moderate) radio blackouts remain likely, with a slight chance for X-class flares (R3-Strong), over 22-24 June. Energetic Particle .24 hr Summary... The greater than 2 MeV electron flux was at low to moderate levels. The greater than 10 MeV proton flux was at background levels. .Forecast... The greater than 2 MeV electron flux is likely to continue at low to moderate levels over 21-23 Jun. There remains a slight chance for protons to become elevated following any significant activity from multiple regions on the visible disk. Solar Wind .24 hr Summary... Solar wind parameters continued to reflect a positive polarity CH HSS regime. Total magnetic field strength was between 6-10 nT. The Bz component reached as far south as -7 nT. Solar wind speeds varied from ~450-575 km/s. Phi angle was predominantly oriented in the positive sector. .Forecast... Elevated solar wind parameters from the influence of a positive polarity coronal hole is likely to persist over 22-24 Jun. Geospace .24 hr Summary... The geomagnetic field was at quiet to active levels. .Forecast... Quiet to unsettled conditions are likely over 22 Jun due to continued coronal hole effects. Active conditions are possible over 23-24 Jun.

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ALERT: Geomagnetic K-index of 4

Space Weather Message Code: ALTK04 Serial Number: 2570 Issue Time: 2025 Jun 22 0302 UTC ALERT: Geomagnetic K-index of 4 Threshold Reached: 2025 Jun 22 0259 UTC Synoptic Period: 0000-0300 UTC Active Warning: Yes NOAA Space Weather Scale descriptions can be found at www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude. Induced Currents - Weak power grid fluctuations can occur. Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.