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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was moderate. Eleven active sunspot regions were on the visble disk with 4 M-class flares produced. The solar wind speed maintained at about 400 km/s. The geomagnetic field was at minor storm levels for 9 hours, at active levels for 6 hours and at quiet to unsettled levels for the rest of the time.
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 reach active levels for short periods on 30 Sep and be quiet to unsettled on 1-2 Oct.
	Published:	2025-09-30 00:04 UTC
	Forecaster:	027/010

During the past 24 hours, solar activity was moderate. Ten active sunspot regions were on the visble disk with 3 M-class flares produced. Due to the effects of coronal hole high speed streams and autumn equinoxe, the solar wind speed increased to about 700 km/s. The geomagnetic field was at major storm levels for 3 hours, at moderate storm levels for 12 hours, at minor storm levels for 9 hours.
Within the next three days, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to reach storm levels on 1 Oct, active levels on 2 Oct and be quiet to unsettled on 3 Oct. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 3 Oct.
	Published:	2025-10-01 00:00 UTC
	Forecaster:	042/039

During the past 24 hours, solar activity was moderate. Nine active sunspot regions were on the visble disk with two M-class flares produced. Due to the effects of coronal hole high speed streams and effects of geomagnetism during the autumn equinoxe, the solar wind speed increased to about 750 km/s. The geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 12 hours, and active levels for 6 hours.
Within the next three days, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to be mainly at quiet to unsettled levels, and reach active or minor storm levels on 2 Oct. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 2-4 Oct.
	Published:	2025-10-01 23:59 UTC
	Forecaster:	041/012

During the past 24 hours, solar activity was moderate. Nine active sunspot regions were on the visble disk with one M-class flare produced. Due to the effects of coronal hole high speed streams and geomagnetism during the autumn equinoxe, the solar wind speed maintained at about 750 km/s. The geomagnetic field reached major storm levels for 3 hours, minor storm levels for 12 hours, and active levels for 6 hours. The greater than 2 MeV electron flux at geosynchronous orbit reached to minor storm levels.
Within the next three days, 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. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels.
	Published:	2025-10-02 23:56 UTC
	Forecaster:	012

During the past 24 hours, solar activity was moderate. Nine active sunspot regions were on the visble disk with two M-class flare produced. The solar wind speed decreased to about 600 km/s. Due to the effects of coronal hole high speed streams and geomagnetism during the autumn equinoxe, the geomagnetic field reached minor storm levels for 6 hours, and active levels for 12 hours and was unsetteld for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached to minor storm levels.
Within the next three days, 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 on 4-5 Oct due to the effects of coronal hole high speed streams and geomagnetism during the autumn equinoxe. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels.
	Published:	2025-10-04 00:03 UTC
	Forecaster:	025

During the past 24 hours, solar activity was low. Eight active sunspot regions were on the visble disk without M-class and above flare produced. The solar wind speed decreased to about 570 km/s. Due to the effects of coronal hole high speed streams, the geomagnetic field reached active levels for 18 hours and was unsetteld for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit reached to minor storm levels.
Within the next three days, solar activity is expected to be mainly moderate with a chance for M-class and above flares. The geomagnetic field is expected to reach isolated active levels due to the effects of coronal hole high speed streams. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 5-6 Oct.
	Published:	2025-10-05 00:20 UTC
	Forecaster:	040

During the past 24 hours, solar activity was low. Seven active sunspot regions were on the visble disk without M-class and above flare produced. The solar wind speed decreased to about 460 km/s. Due to the effects of coronal hole high speed streams, the geomagnetic field was quiet to unsetteld. The greater than 2 MeV electron flux at geosynchronous orbit maintained at minor storm levels.
Within the next three days, solar activity is expected to be low to moderate with a chance for M-class and above flares. The geomagnetic field is expected to reach isolated active to minor storm levels due to the effects of CME on 3 Oct. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 6 Oct.
	Published:	2025-10-06 00:17 UTC
	Forecaster:	040

WEEKLY REPORTS

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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 01:42 UTC
	Forecaster:	042/012

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 02:32 UTC
	Forecaster:	012/029

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

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.