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| During the last week, solar activity was moderate on 4 and 7 May and low on the other days. Twelve sunspot active regions (AR4420, AR4423-AR4425, AR4428-4435) were on the visible disk with two M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 117 sfu to 159 sfu. Due to the continuous effect of a recurrent coronal hole high speed stream, the solar wind speed reached about 520km/s and the geomagnetic field reached active levels for six hours on 1 May. Due to the effect of a CME, the solar wind speed reached a peak of about 450km/s and the geomagnetic field reached moderate storm levels for 3 hours, minor storm levels for 6 hours, active levels for 3 hours during 4-5 May. It was quiet to unsettled for the rest of the time. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class above flares. The geomagnetic field is expected to be mainly quiet to unsettled. It is expected to reach isolated active levels on 8 May due to the effect of a recurrent coronal hole high speed stream. | | Published: 2026-05-08 06:30 UTC Forecaster: 022/042 |
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| During the last week, solar activity was high on 10 May and low on the other days. Eleven sunspot active regions (AR4431-AR44236, AR4438) were on the visible disk with one M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 103 sfu to 126 sfu. The solar wind speed reached a peak of 600 km/s on 8 May. The geomagnetic field was quiet to unsettled. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to reach storm levels on 15-16 May and isolated active levels on 17-18 May due to the effect of a recurrent coronal hole high speed stream. It is expected to be quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 19-21 May. | | Published: 2026-05-15 06:30 UTC Forecaster: 040/015 |
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| During the last week, solar activity was moderate on 16-17 May and low on the other days. Nine sunspot active regions (AR4435-AR4436, AR4438-AR4444) were on the visible disk with four M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 101 sfu to 118 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 730km/s, and the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 15 hours and active levels for 9 hours on 15-16 May. Due to the effect of a CME on 16 May, the solar wind speed reached a peak of about 630km/s and the geomagnetic field reached active levels for 12 hours on 19 May. It was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 17-19 May and 21 May. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to reach isolated active levels on 22-23 May and isolated active to minor storm levels on 27-28 May due to the effect of a recurrent coronal hole high speed stream. It is expected to be quiet to unsettled for the rest of the time. | | Published: 2026-05-22 06:30 UTC Forecaster: 012/042 |
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| During the last week, solar activity was moderate on 22 May and low on the other days. Fourteen sunspot active regions (AR4439, AR4441, AR4444-AR4455) were on the visible disk with one M-class flare produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the level of a minor solar proton event on 26 May and the maximum proton flux reached 24 pfu. The F10.7 index ranged from 124 sfu to 145 sfu. The geomagnetic field reached active level for 3 hours on 26 May. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 480km/s, and the geomagnetic field reached active level for 3 hours on 28 May. It was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 22-24 May. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to reach isolated active levels on 29 May. It is expected to be quiet to unsettled for the rest of the time. | | Published: 2026-05-29 06:30 UTC Forecaster: 026/016 |
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| During the last week, solar activity was high on 3 Jun, moderate on 29 May and 2 Jun, and low on the other days. Fourteen sunspot active regions (AR4444, AR4446-AR4447, AR4449, AR4452, AR4454-AR4462) were on the visible disk with one X1.0 and six M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 132 sfu to 148 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 550km/s, and the geomagnetic field was at active levels for 12 hours on 29-31 May. It was quiet to unsettled for the rest of the time. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. Due to the effects of multiple CMEs on 3 Jun, the geomagnetic field is expected to reach storm levels on 5-6 Jun. It is expected to be quiet to unsettled for the rest of the time. | | Published: 2026-06-05 06:30 UTC Forecaster: 027/022 |
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