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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was low. Seven active sunspot regions were on the visble disk without M-class and above flares produced. The solar wind speed decreased to about 470 km/s. The geomagnetic field was at active levels for 6 hours and was quiet for the rest of the time.
Within the next three days, 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 on 11-12 Sep and reach active to minor storm levels on 13 Sep due to the effect of the recurrent coronal hole high speed stream.
	Published:	2025-09-10 23:27 UTC
	Forecaster:	010/026

During the past 24 hours, solar activity was low. Seven active sunspot regions were on the visble disk without M-class and above flares produced. The solar wind speed decreased to about 400 km/s. The geomagnetic field was at active levels for 3 hours and was quiet to unsettled for the rest of the time.
Within the next three days, solar activity is expected to be mainly low with a little chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled on 12 Sep and reach active to minor storm levels on 13-14 Sep due to the effect of the recurrent coronal hole high speed stream.
	Published:	2025-09-11 23:57 UTC
	Forecaster:	026/012

During the past 24 hours, solar activity was low. Five active sunspot regions were on the visble disk without M-class and above flares produced. The solar wind speed decreased to about 360 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be mainly low with a little chance for M-class flares. The geomagnetic field is expected to reach 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 23:54 UTC
	Forecaster:	012/041

During the past 24 hours, solar activity was low. Three active sunspot regions were on the visble disk without M-class and above flares produced. The solar wind speed decreased to about 350 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be mainly low with a little chance for M-class flares. The geomagnetic field is expected to reach active to minor storm levels on 14-15 Sep due to the effect of the recurrent coronal hole high speed stream.
	Published:	2025-09-14 00:05 UTC
	Forecaster:	041/025

During the past 24 hours, solar activity was low. Five active sunspot regions were on the visble disk without M-class and above flares produced. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed increased to about 650 km/s and the geomagnetic field reached minor storm levles for 3 hours and was at quiet to unsettled levels for the rest of the time.
Within the next three days, solar activity is expected to be mainly low with a little chance for M-class flares. The geomagnetic field is expected to reach acvive to minor storm levels on 15-16 Sep due to the continuous effect of the recurrent coronal hole high speed stream and will be at quiet to unsettled levels for the rest of the time.
	Published:	2025-09-14 23:48 UTC
	Forecaster:	025/012

During the past 24 hours, solar activity was low. Six active sunspot regions were on the visble disk without M-class and above flares produced. Due to the continuous effect of the recurrent coronal hole high speed stream, the solar wind speed increased to about 800 km/s and the geomagnetic field reached major storm levels for 3 hours, minor storm levles for 12 hours and active levels for 9 hours.
Within the next three days, solar activity is expected to be mainly low with a little chance for M-class flares. The geomagnetic field is expected to reach acvive or minor storm levels on 16 Sep due to the continuous effect of the recurrent coronal hole high speed stream and will be at quiet to unsettled levels for the rest of the time.
	Published:	2025-09-15 23:56 UTC
	Forecaster:	012/022

During the past 24 hours, solar activity was low. Nine active sunspot regions were on the visble disk without any M-class or above flares produced. Due to the continuous effect of the recurrent coronal hole high speed stream, the solar wind speed slowly decreased to about 700 km/s and the geomagnetic field was at minor storm levels for 3 hours, active levels for 12 hours and quiet to unsettled levels for the rest of 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 low with a little chance for M-class flares. The geomagnetic field is expected to be at unsettled levels predominately due to the residual effects of the recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels.
	Published:	2025-09-16 23:58 UTC
	Forecaster:	022/039

WEEKLY REPORTS

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During the last week, solar activity was low. Seventeen sunspot regions (AR4149-AR4150, AR4153-AR4167) were on the visible disk without M-class and above flares produced. The F10.7 index ranged between 143 sfu to 152 sfu. No solar proton event occurred. Due to the effect of the CME on 23 Jul, the geomagnetic field reached active levels for 3 hours on 26 Jul. It was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 25-26 Jul.
Within the next week, solar activity is expected to be mainly low. Due to the effect of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active levels on 4-5 Aug and will be mainly quiet to unsettled for the rest of the time.
	Published:	2025-08-01 00:49 UTC
	Forecaster:	041/026

During the last week, solar activity reached moderate levels on 3-7 Aug and low levels for the rest of the time. Fifteen active sunspot regions ( AR4153-AR4155, AR4157, AR4161, AR4165-AR4174 ) were on the visible disk with 8 M-class flares produced. The F10.7 index ranged from 142 sfu to 158 sfu. No solar proton event occurred. The solar wind speed reached the maximum of 570 km/s and the geomagnetic field reached active levels for 3 hours on 3 Aug. It was quiet to unsettled for the rest of the time.
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 18-19 Jul. Due to the effect of another recurrent coronal hole high speed stream, the geomagnetic field is expected to reach isolated active or minor storm levels on 8-12 Aug. It will be mainly quiet to unsettled for the rest of the time.
	Published:	2025-08-08 02:24 UTC
	Forecaster:	016

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 02:06 UTC
	Forecaster:	010

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

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.