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| During the last week, solar activity was high on 28-29 Nov, 1 Dec and 4 Dec, and low for the rest of the time. 13 sunspot active regions (AR4287-AR4288, AR4290-AR4292, AR4294-AR4301) were on the visible disk with an X-class and 8 M-class flares produced. The F10.7 index increased from 138 sfu to 220sfu. No solar proton event occurred. Due to the effects of a recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 660 km/s on 28 Nov, and the geomagnetic field was at active levels for 33 hours on 28 Nov-1 Dec. Due to the effects of another recurrent coronal hole high speed stream as well as a CME produced on 1 Dec, the solar wind speed reached a peak value of about 730 km/s on 4 Dec, and the geomagnetic field was at major storm levels for 3 hours, minor storm levles for 15 hours, active levels for 12 hours on 3-4 Dec. 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 was at minor storm levels from 28 Nov to 3 Dec. | |
| Within the next week, solar activity is expected to be moderate to high, with chances for M and above class flares. The geomagnetic field is expected to reach active to minor storm levels on 5 Dec due to the continuous effect of the recurrent coronal hole high speed stream and the CME produced on 1 Dec. The geomagnetic field will be quiet to unsettled for the rest of time. | | Published: 2025-12-05 06:30 UTC Forecaster: 039/022 |
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| During the last week, solar activity was high on 6, 8-10 Dec, moderate on 7 Dec, and low for the rest of the time. Thirteen sunspot active regions (AR4294-AR4296, AR4298-AR4307) were on the visible disk with an X1.1 flare and eighteen M-class flares produced. The F10.7 index decreased from 206 sfu to 146 sfu. No solar proton event occurred. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 700 km/s and the geomagnetic field was at active levels for 9 hours on 5-7 Dec. Due to the effect of CME, the solar wind speed reached a peak value of about 470 km/s and the geomagnetic field was at moderate storm levels for 6 hours, minor storm levles for 6 hours, and active levels for 3 hours on 10-11 Dec. The geomagnetic field 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 chances for M-class and above flares. The geomagnetic field will reach isolated active levels on 12 Dec due to the continuous effect of the CME, and reach active to minor storm levels on 13-15 Dec due to the effect of the recurrent coronal hole high speed stream. It will be quiet to unsettled for the rest of time. | | Published: 2025-12-12 06:30 UTC Forecaster: 027/041 |
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| During the last week, solar activity was moderate on 12 Dec and low for the rest of the time. Twelve sunspot active regions (AR4294, AR4296, AR4299, AR4304-AR4305, AR4307-AR4313) were on the visible disk with two M-class flares produced. The F10.7 index decreased from 135 sfu to 116 sfu. No solar proton event occurred. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached the peak of about 700 km/s and the geomagnetic field was at active levels for 9 hours on 12-13 Dec. Due to the effect of another recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 670 km/s and the geomagnetic field was at minor storm levels for 3 hours and active levels for 9 hours on 17-18 Dec. It was at quiet to unsettled levels for the rest of the time. | |
| Within the next week, solar activity is expected to be mainly low. The geomagnetic field will reach isolated active levels to minor storm levels on 23-25 Dec due to the effect of a recurrent coronal hole high speed stream. It will be quiet to unsettled for the rest of time. | | Published: 2025-12-19 06:30 UTC Forecaster: 012/010 |
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| During the last week, solar activity was moderate on 19-21 Dec and low for the rest of the time. Twelve sunspot active regions (AR4311-AR4322) were on the visible disk with three M-class flares produced. The F10.7 index increased from 118 sfu to 163 sfu. No solar proton event occurred. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached the peak of about 750 km/s and the geomagnetic field was at minor storm levels for 9 hours and active levels for 54 hours on 21-24 Dec. It 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 19-20 Dec and 23-25 Dec. | |
| 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. The greater than 2 MeV electron flux at geosynchronous orbit will remain at minor storm levels on 26-28 Dec. | | Published: 2025-12-26 06:30 UTC Forecaster: 022/015 |
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| During the last week, solar activity was high on 27, 31 Dec, moderate on 28-29 Dec and low for the rest of the time. Seventeen sunspot active regions (AR4312, AR4316-AR4317, AR4319-AR4332) were on the visible disk with six M-class flares produced. The F10.7 index fluctuated between 166 sfu and 195 sfu. No solar proton event occurred. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached the peak of about 540 km/s on 31 Dec. The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 26-30 Dec. | |
| 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 reach isolated active to storm levels due to effects of a recurrent coronal hole high speed stream and CMEs from 31 Dec and 1 Jan, and be mainly quiet to unsettled for the rest of the time. | | Published: 2026-01-02 06:30 UTC Forecaster: 039/041 |
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