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| During the last week, solar activity was at moderate levels on 29-30 Apr and at low levels for the rest of time. Fourteen active sunspot regions (AR4062, AR4064-AR4065, AR4068-AR4070, AR4072-AR4079) were on the visible disk with 4 M-calss flares produced. The F10.7 index ranged from 148 sfu to 164 sfu. No solar proton event occurred. Due to the effect of the coronal hole high speed streams, the solar wind speed reached the peak of 500km/s and the geomagnetic field was at minor storm levels for 6 hours, active levels for 15 hours on 30 Apr-1 May. It was quiet to unsettled for the rest of time. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. Due to the effect of the coronal hole high speed streams, the geomagnetic field is expected to reach isolated active or storm levels on 2-3 May and reach isolated active levels on 5-7 May. It will be quiet to unsettled for the rest of the time. | | Published: 2025-05-02 06:30 UTC Forecaster: 010/027 |
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| During the last week, solar activity was at low levels. Seven sunspot regions (AR4076, AR4079-AR4084) were on the visible disk without M-calss or above flares produced. The F10.7 index ranged from 149 sfu to 159 sfu. No solar proton event occurred. Due to the effects of multiple coronal hole high speed streams, the solar wind speed reached the peak of 800km/s and the geomagnetic field was at minor storm levels for 30 hours, active levels for 54 hours on 2-5 May. Due to the effect of another coronal hole high speed stream, the geomagnetic field reached active level for 3 hours on 8 May. It was quiet to unsettled for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 3-8 May. | |
| Within the next week, solar activity is expected to be low to moderate with slight chances for M-class flares. Due to the continuous effect of the coronal hole high speed streams, the geomagnetic field is expected to reach storm levels on 9 May and reach isolated active levels on 10-13 May. | | Published: 2025-05-09 06:30 UTC Forecaster: 022/039 |
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| During the last week, solar activity was at high levels on 13, 14 May, at moderate levels on 11, 15 May, and at low levels for the rest of the time. Eight sunspot regions (AR4079, AR4081-AR4082, AR4084-AR4088) were on the visible disk with two X-class flares and six M-calss flares produced. The F10.7 index ranged from 116 sfu to 136 sfu. No solar proton event occurred. Due to the effect of the coronal hole high speed streams, the solar wind speed reached the peak of 500km/s and the geomagnetic field was at active levels for 12 hours on 9-10 May. The geomagnetic field was at minor storm levels for 3 hours and active levels for 3 hours on 11 May. Due to the effect of another coronal hole high speed stream, the geomagnetic field reached active level for 12 hours on 14-15 May. It was quiet to unsettled for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 9 May. | |
| Within the next week, solar activity is expected to be mainly moderate with chances for M-class and above flares. Due to the effect of the recurrent coronal hole high speed streams, the geomagnetic field is expected to reach isolated active to storm levels on 17-20 May. | | Published: 2025-05-16 06:30 UTC Forecaster: 041/012 |
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| During the last week, solar activity was at moderate levels on 19, 21 May, and at low levels for the rest of the time. Eleven sunspot regions (AR4087-AR4097) were on the visible disk with two M-calss flares produced. The F10.7 index ranged from 117 sfu to 120 sfu. No solar proton event occurred. Due to the effect of the coronal hole high speed streams, the geomagnetic field was at moderate storm levels for 3 hours, minor storm levels for 9 hours and active levels for 24 hours on 16-21 May. It was quiet to unsettled for the rest of time. | |
| Within the next week, solar activity is expected to be low to moderate with a chance for M-class flares. Due to the continuous effect of the recurrent coronal hole high speed streams, the geomagnetic field is expected to reach isolated active to storm levels on 23-24 May. Due to the effect of another recurrent coronal hole high speed streams, the geomagnetic field is expected to reach storm levels on 28-29 May. It will be quiet to unsettled for the rest of the time. | | Published: 2025-05-23 06:30 UTC Forecaster: 027/026 |
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| During the last week, solar activity was high on 25 May, moderate on 24 and 26 May, and low for the rest of the time. Fourteen sunspot regions (AR4087, AR4090, AR4092-AR4103) were on the visible disk with an X-class flare and six M-calss flares produced. The F10.7 index ranged from 122 sfu to 145 sfu. No solar proton event occurred. Due to the effect of coronal hole high-speed streams, the solar wind speed reached a peak value of about 610 km/s between 27 and 28 May, during which the geomagnetic field was at active levels for 12 hours. Subsequently, the solar wind speed began to rise again and reached a higher peak of about 750 km/s on 29 May. This resulted in geomagnetic storms throughout the day, with major storm levels persisting for 3 hours, moderate storm levels for 9 hours, and minor storm levels for 12 hours. Meanwhile, the geomagnetic field was quiet to unsettled from 23 to 26 May. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. Due to the continuous effect of the recurrent coronal hole high speed streams, the geomagnetic field is expected to reach isolated active to storm levels for the next five days, and be quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach storm levels. | | Published: 2025-05-30 06:30 UTC Forecaster: 040/022 |
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