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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was moderate. Six active sunspot regions were on the visble disk with three M-class flares produced. The solar wind speed decreased to about 580 km/s. The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
Within the next three days, solar activity is expected to be mainly moderate. The geomagnetic field will reach isolated active or minor storm levels on 16-17 Oct due to the effects of several CMEs on 11 and 13 Oct. It will be quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 15 Oct.
	Published:	2025-10-14 23:47 UTC
	Forecaster:	015/010

During the past 24 hours, solar activity was high. Five active sunspot regions were on the visble disk with five M-class flares produced from AR4246. The solar wind speed decreased to about 470 km/s. The geomagnetic field was at active levels for 3 hours and quiet to unsettled levels for the rest ot time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
Within the next three days, solar activity is expected to be mainly moderate. The geomagnetic field will reach minor storm levels on 16-17 Oct due to the effects of several CMEs on 11-13 Oct. It will be quiet to unsettled on 18 Oct.
	Published:	2025-10-15 23:52 UTC
	Forecaster:	010/022

During the past 24 hours, solar activity was moderate. Seven active sunspot regions were on the visble disk with four M-class flares produced from AR4246. The solar wind speed decreased to about 400 km/s. The geomagnetic field was quiet. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels.
Within the next three days, solar activity is expected to be mainly moderate. The geomagnetic field will reach active to minor storm levels on 17-18 Oct due to the effects of several CMEs on 11-13 Oct, and is expected to reach active to minor storm levels on 19 Oct as the arrival of a recurrent coronal high speed stream.
	Published:	2025-10-16 23:58 UTC
	Forecaster:	022/039

During the past 24 hours, solar activity was high. Eight active sunspot regions were on the visble disk with 6 M-class flares produced from AR4246. The solar wind speed maintaind at about 400 km/s. The geomagnetic field was quiet to unsettled.
Within the next three days, solar activity is expected to be mainly moderate. The geomagnetic field will reach active levels on 18 Oct due to the effects of several CMEs from 13-15 Oct, and is expected to reach active to minor storm levels on 19-20 Oct as the arrival of a recurrent coronal high speed stream.
	Published:	2025-10-18 00:18 UTC
	Forecaster:	039/026

During the past 24 hours, solar activity was high. Seven active sunspot regions were on the visble disk with 5 M-class flares produced from AR4246. Due to the effects of CMEs from 13-15 Oct, the solar wind speed increased to about 550 km/s. The geomagnetic field reached moderate storm leves for 3 hours, minor storm levels for 6 hours, active levels for 12 hours.
Within the next three days, solar activity is expected to be low to moderate. The geomagnetic field is expected to reach active to minor storm levels on 19-20 Oct as the arrival of a recurrent coronal high speed stream and will be quiet to unsettled on 21 Oct.
	Published:	2025-10-19 00:04 UTC
	Forecaster:	026/027

During the past 24 hours, solar activity was moderate. Eight active sunspot regions were on the visble disk with 2 M-class flares produced from AR4246. Due to the effects of the CME from 15 Oct and the recurrent coronal hole high speed stream, the solar wind speed increased to about 600 km/s. The geomagnetic field reached minor storm level for 3 hours and quite to unsettled levels for the rest of the time.
Within the next three days, solar activity is expected to be low to moderate. The geomagnetic field is expected to reach active to minor storm levels on 20 Oct due to the recurrent coronal high speed stream and will be quiet to unsettled on 21-22 Oct.
	Published:	2025-10-20 00:04 UTC
	Forecaster:	027/010

During the past 24 hours, solar activity was moderate. Nine active sunspot regions were on the visble disk with one M-class flare produced from AR4248. The solar wind speed decreased to about 540 km/s. The geomagnetic field was at quite to unsettled levels.
Within the next three days, solar activity is expected to be low to moderate with a chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2025-10-20 23:39 UTC
	Forecaster:	010/042

WEEKLY REPORTS

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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 02:11 UTC
	Forecaster:	026/040

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 03:50 UTC
	Forecaster:	026/012

During the last week, solar activity was low. Fourteen active sunspot regions (AR4211, AR4213-4225) were on the visible disk with no M-class flares produced. No solar proton event occurred. The F10.7 index increased from 114 sfu to 150 sfu. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of 800 km/s, the geomagnetic field was at major storm levels for 3 hours, minor storm levels for 18 hours and active levels for 21 hours during 14-16 Sep. 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 16-18 Sep.
Within the next week, solar activity is expected to be low to moderate with a chance 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 or minor storm levels on 22-23 Sep. It will be mainly quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 19-21 Sep.
	Published:	2025-09-19 02:23 UTC
	Forecaster:	027/042

During the last week, solar activity was low to moderate. Fifteen active sunspot regions (AR4216-4217, AR4219-4231) were on the visible disk with 4 M-class flares produced. No solar proton event occurred. The F10.7 index varied between 160 sfu and 184 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak value of 600 km/s during 22-23 Sep, and the geomagnetic field was at active levels for 3 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 maintained at minor storm levels on 19-21 Sep.
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 be quiet to unsettled.
	Published:	2025-09-26 02:24 UTC
	Forecaster:	012/022

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 02:34 UTC
	Forecaster:	012

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 02:57 UTC
	Forecaster:	016/027

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 02:42 UTC
	Forecaster:	039

SOLAR IMAGES

The active region magnetogram is created from the raw full-disk longitudinal magnetogram data, which is observed at Huairou Solar Observatory Station of Beijing in China.