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| During the last week, solar activity was at moderate levels on 8-12 Aug and low levels on 13-14 Aug. Twenty-two active sunspot regions ( AR4161, AR4165-AR4185 ) were on the visible disk with 12 M-class flares produced. The F10.7 index ranged from 130 sfu to 153 sfu. No solar proton event occurred. Due to the effects of the recurrent coronal hole high speed stream and CME on 5 Aug, the solar wind speed reached the peak of 700 km/s and the geomagnetic field reached moderate levels for 3 hours and minor storm levels for 21 hours on 8-9 Aug. It reached active levels for a total of 36 hours on 8-14 Aug. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels on 11-14 Aug. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. Due to the effect of a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach minor storm levels on 18-20 Aug. It will be mainly quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit will maintained at minor storm levels on 15 Aug. | | Published: 2025-08-15 06:30 UTC Forecaster: 010 |
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| During the last week, solar activity was at moderate levels on 19 Aug and low levels on the rest time. Nineteen active sunspot regions (AR4169, AR4171-AR4172, AR4175, AR4177, AR4179-AR4192) were on the visible disk with one M-class flare produced on 19 Aug. The F10.7 index ranged from 114 sfu to 123 sfu. No solar proton event occurred. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached the peak of 680 km/s and the geomagnetic field reached minor storm levels for 3 hours and active levels for 12 hours on 19-20 Aug. It was at quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels on 15-17 Aug. | |
| 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 recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active levels on 25-26 Aug. It will be mainly quiet to unsettled for the rest of the time. | | Published: 2025-08-22 06:30 UTC Forecaster: 042/012 |
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| During the last week, solar activity was moderate on 22-26, 28 Aug and low for the rest of time. Eighteen active sunspot regions (AR4187-AR4204) were on the visible disk with sixteen M-class flares produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the threshold of minor solar proton event levels on 26-27 Aug with a peak of 14 pfu. The F10.7 index increased from 136 sfu to 232 sfu. The geomagnetic field was at quiet to unsettled levels. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled. | | Published: 2025-08-29 06:30 UTC Forecaster: 012/029 |
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| During the last week, solar activity was moderate on 29-30 Aug, 4 Sep and low for the rest of time. Seventeen active sunspot regions (AR4191, AR4196-AR4202, AR4204-AR212) were on the visible disk with five M-class flares produced. No solar proton event levels happened. The F10.7 index decreased from 232 sfu to 172 sfu. The geomagnetic field was at moderate storm levels for 3 hours, minor storm levels for 9 hours, active levels for fifteen hours, due to the effect of the halo CME on 30 Aug, it was quiet to unsettled levels for the rest of time. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels with isolated minor storm levels on 5-7 Sep and active levels on 8-10 Sep due to the effect of the recurrent coronal hole high speed stream and the CME on 4 Sep. it will be quiet to unsettled levels for the rest of time. | | Published: 2025-09-05 06:30 UTC Forecaster: 026/040 |
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| During the last week, solar activity was moderate on 5-6 Sep, and low for the rest of time. Thirteen active sunspot regions (AR4197, AR4199, AR4201-AR4202, AR4206-AR4207, AR4210-AR4216) were on the visible disk with two M-class flares produced. No solar proton event levels happened. The F10.7 index decreased from 149 sfu to 115 sfu. Due to the effect of the recurrent coronal hole high speed stream and CME of 4 Sep, the solar wind speed reached a peak value of 670 km/s, the geomagnetic field was at minor storm levels for 3 hours, active levels for fifteen hours on 6 Sep. The geomagnetic field was at moderate storm levels for 3 hours, active levels for twelve hours on 8-11 Sep, it was quiet to unsettled levels for the rest of time. | |
| Within the next week, solar activity is expected to be low to moderate with chances for M-class flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels with isolated active to minor storm levels on 13-15 Sep due to the effect of the recurrent coronal hole high speed stream. | | Published: 2025-09-12 06:30 UTC Forecaster: 026/012 |
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