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| During the last week, solar activity was very low on 19 Apr, high on 23 Apr, and low on the other days. Six active sunspot regions (AR4415-AR4416, AR4419-AR4422) were on the visible disk with five M-class flares produced. No solar proton event occurred. The F10.7 index increased from 105 sfu to 128 sfu. Due to the effects of several recurrent coronal hole high speed streams, the solar wind speed reached a peak value of about 580 km/s, and the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 18 hours, and active levels for 30 hours on 18-21 Apr. 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, 22-23 Apr. | |
| Within the next week, solar activity is expected to be mainly 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 to minor storm levels on 25-27 Apr due to the effect of the recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 24 Apr. | | Published: 2026-04-24 06:30 UTC Forecaster: 041 |
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| During the last week, solar activity was high on 24, 26 Apr, and moderate on 25, 27-28 Apr and low on the other days. Eleven active sunspot regions (AR4419-AR4429) were on the visible disk with two X-class and fourteen M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 143 sfu to 156 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached about 460km/s and the geomagnetic field reached active levels on 24. Due to the effect of another recurrent coronal hole high speed stream, the solar wind speed reached about 510km/s and the geomagnetic field reached minor storm levels for 3 hours, active levels for 3 hours on 30 Apr. 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 24 Apr. | |
| 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 to minor storm levels on 1, 7 May due to the effects of the recurrent coronal hole high speed streams. | | Published: 2026-05-01 06:30 UTC Forecaster: 027/010 |
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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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