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| During the last week, solar activity was high on 28 Sep and moderate on 26-27 Sep and 29 Sep to 2 Oct. Neneteen active sunspot regions (AR4217, AR4224-4241) were on the visible disk with 15 M-class flares produced. No solar proton event occurred. The F10.7 index varied between 164 sfu and 187 sfu. Due to the effects of a recurrent coronal hole high speed stream and geomagnetism during the autumn equinoxe, the solar wind speed reached a peak value of 750 km/s during 29 Sep to 2 Oct, and the geomagnetic field reached major storm levels for 6 hours, moderate storm levels for 15 hours, minor storm levels for 42 hours and active levels for 18 hours. The geomagnetic field was at quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 2 Oct. | |
| Within the next week, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to reach active or minor storm levels 3-7 Oct due to the continuous effects of coronal hole high speed streams and geomagnetism during the autumn equinoxe. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 3-5 Oct. | | Published: 2025-10-03 06:30 UTC Forecaster: 012 |
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| During the last week, solar activity was moderate on 3 Oct and 9 Oct, and low for the rest of the time. Fifteen active sunspot regions (AR4230, AR4232-4233, AR4235-4236, AR4238, AR4241-4249) were on the visible disk with 3 M-class flares produced. No solar proton event occurred. The F10.7 index decreased from 170 sfu to 120 sfu. Due to the effects of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of 800 km/s during 3-4 Oct, and the geomagnetic field reached minor storm levels for 6 hours and active levels for 27 hours. Due to the effect of the CME on 3 Oct, the solar wind speed reached a peak value of 450 km/s during 7-8 Oct, and the geomagnetic field reached active levels for 6 hours. The geomagnetic field was at quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 3-5 Oct, 7-9 Oct and reached moderate storm levels on 6 Oct. | |
| Within the next week, solar activity is expected to be mainly low with a chance for M-class flares. The geomagnetic field is expected to reach storm levels on 11-13 Oct due to the effect of the recurrent coronal hole high speed stream. It will be quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 14-16 Oct. | | Published: 2025-10-10 06:30 UTC Forecaster: 016/027 |
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| During the last week, solar activity was high on 15 Oct, moderate on 13-14 Oct and 16 Oct and low for the rest of the time. Fourteen active sunspot regions (AR4241, AR4245-4256) were on the visible disk with 15 M-class flares produced. No solar proton event occurred. The F10.7 index increased from 121 sfu to 161 sfu. Due to the effects of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of 810 km/s during 11-13 Oct, and the geomagnetic field reached minor storm levels for 12 hours and active levels for 30 hours. The geomagnetic field reached active levels for 3 hours respectively on 10, 15 Oct. The geomagnetic field was at quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 13-16 Oct. | |
| Within the next week, solar activity is expected to be mainly moderate with a chance for M-class flares. The geomagnetic field is expected to reach storm levels on 17-18 Oct due to the effect of the CME from 13 Oct.The geomagnetic field is expected to reach storm levels on 19-20 Oct due to the effect of the recurrent coronal hole high speed stream. It will be quiet to unsettled for the rest of the time. | | Published: 2025-10-17 06:30 UTC Forecaster: 039 |
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| During the last week, solar activity was high on 17-18 Oct, moderate on 19-20 Oct and low for the rest of the time. Sixteen active sunspot regions (AR4246, AR4248, AR4250, AR4252, AR4254-4265) were on the visible disk with 14 M-class flares produced. The F10.7 index decreased from 164 sfu to 130 sfu. Due to the effects of the recurrent coronal hole high speed stream and CME on 13-15 Oct, the solar wind speed reached a peak value of 600 km/s during 18-19 Oct, the geomagnetic field reached moderate storm levels for 3 hours, minor storm levels for 9 hours , active levels for 12 hours and was at quiet to unsettled levels 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. The geomagnetic field is expected to reach activ or storm levels on 26-30 Oct due to the effect of the recurrent coronal hole high speed stream and will be quiet to unsettled for the rest of the time. | | Published: 2025-10-24 06:30 UTC Forecaster: 025/040 |
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| During the last week, solar activity was low. Eleven active sunspot regions (AR4252, AR4254, AR4257, AR4261-4262, AR4266-4271) were on the visible disk without M-class or above flares produced. The F10.7 index decreased from 134 sfu to 118 sfu. The geomagnetic field reached active levels for 3 hours on 25 Oct. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of 650 km/s during 28-31 Oct, the geomagnetic field reached minor storm levels for 12 hours, active levels for 27 hours and was at quiet to unsettled levels for the rest of the time. | |
| Within the next week, solar activity is expected to be mainly moderate with a chance for M-class and above flares. Due to the effects of two coronal hole high speed streams, the geomagnetic field is expected to reach active to minor storm levels on 31 Oct-3 Nov. The geomagnetic field is expected to reach active levels on 6 Nov due to the effect of another coronal hole high speed stream. It will be quiet to unsettled for the rest of the time. | | Published: 2025-10-31 06:30 UTC Forecaster: 016/042 |
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