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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was moderate. Four active sunspot regions were on the visible disk with an M1.7 flare produced. The solar wind speed decreased to about 360 km/s. The geomagnetic field was quiet.
Within the next three days, solar activity is expected to be low to moderate, likely for M-class flares. The geomagnetic field is expected to be quiet to unsettled on 25 Aug, with chances for active levels for isolated time periods due to the arrival of a coronal hole high speed stream on 26-27 Aug.
	Published:	2026-08-25 00:02 UTC
	Forecaster:	022/027

During the past 24 hours, solar activity was high. Four active sunspot regions were on the visible disk with 4 M-class flares produced in which an M6.9 flare was the largest. The solar wind speed maintained at about 320 km/s. The geomagnetic field was quiet.
Within the next three days, solar activity is expected to be mainly moderate, likely for M-class flares. The geomagnetic field is expected to be quiet to unsettled on 26 Aug. It will reach active levels to minor storm levels due to the arrival of the CMEs from 25 Aug and a coronal hole high speed stream on 27-28 Aug.
	Published:	2026-08-26 00:05 UTC
	Forecaster:	027/026

During the past 24 hours, solar activity was moderate. Six active sunspot regions were on the visible disk with 2 M-class flares produced. The solar wind speed decreased to about 280 km/s. The geomagnetic field was at quiet levels.
Within the next three days, solar activity is expected to be mainly moderate, likely for M-class flares. The geomagnetic field is expected to reach active levels to minor storm levels on 27-28 Aug due to the effects of a coronal hole high speed stream and the CME from 25 Aug, mainly quiet to unsettled on 29 Aug.
	Published:	2026-08-26 23:24 UTC
	Forecaster:	026/016

During the past 24 hours, solar activity was low. Five active sunspot regions were on the visible disk without M-class or above flares produced. The solar wind speed maintained at about 260 km/s. The geomagnetic field was at quiet 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 reach active levels to minor storm levels on 28 Aug due to the effects of a coronal hole high speed stream and the CME from 25 Aug, mainly quiet to unsettled on 29-30 Aug.
	Published:	2026-08-27 23:13 UTC
	Forecaster:	016/042

During the past 24 hours, solar activity was low. Six active sunspot regions were on the visible disk without M-class or above flares produced. Due to the effects of a coronal hole high speed stream and the CME from 25 Aug, the solar wind speed increased to about 400 km/s. The geomagnetic field was at active levels for nine hours and quiet to unsettled levels for the rest of time.
Within the next three days, solar activity is expected to be mainly low with a chance for M-class flares. The geomagnetic field is expected to reach isolated active levels levels on 29 Aug due to the continuous effects of a coronal hole high speed stream and the CME from 25 Aug. It will be mainly quiet to unsettled for the rest of time.
	Published:	2026-08-29 00:04 UTC
	Forecaster:	042/026

During the past 24 hours, solar activity was low. Five active sunspot regions were on the visible disk without M-class or above flares produced. Due to the continuous effects of a coronal hole high speed stream and the CME from 25 Aug, the solar wind speed miantained at about 420 km/s. The geomagnetic field was at active levels for 9 hours and quiet to unsettled levels for the rest of the time.
Within the next three days, solar activity is expected to be very low to low. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2026-08-29 23:57 UTC
	Forecaster:	026/040

During the past 24 hours, solar activity was low. Five active sunspot regions were on the visible disk without M-class or above flares produced. Due to the continuous effects of a coronal hole high speed stream and the CME from 25 Aug, the solar wind speed miantained at about 460 km/s. The geomagnetic field was at active levels for 9 hours and quiet to unsettled levels for the rest of the time.
Within the next three days, solar activity is expected to be very low to low. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2026-08-31 00:09 UTC
	Forecaster:	040/015

WEEKLY REPORTS

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During the last week, solar activity was moderate on 12 Jul, and low on other time. Eight sunspot active regions (AR4481-AR4482, AR4485, AR4487-AR4491) were on the visible disk with one M1.1 flare produced. No solar proton event occurred. The F10.7 index decreased from 112 sfu to 100 sfu. Due to the persistent effects of the recurrent coronal hole high speed stream, the solar wind speed reached a peak value of about 660 km/s and the geomagnetic field was at active levels for 3 hours. Due to the effect of the CME produced on 9 Jul and 10 Jul, the solar wind speed reached a peak value of about 580 km/s and the geomagnetic field was at minor storm level for 3 hours and active levels for 9 hours. Due to the effect of the CME produced on 11 Jul, the geomagnetic field reached active levels for 3 hours on 15 Jul . The geomagnetic field 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 11-12 Jul.
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 active to minor storm levels on 21 and 22 Jul 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:	2026-07-17 02:17 UTC
	Forecaster:	040/012

During the last week, solar activity was moderate on 20-22 Jul, and very low on 17 Jul, and low on other time. Six sunspot active regions (AR4489,AR4491-AR4495) were on the visible disk with five M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 105 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 about 490 km/s and the geomagnetic field was at active levels for 3 hours. Due to the effects of recurrent coronal hole and CMEs on 21, solar wind speed reached a peak of about 710 km/s. The geomagnetic field reached minor storm levels for six hours. It was quiet to unsettled for the rest of time. It was quiet to unsettled 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 reach active levels on 24 Jul. 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 25-28 Jun.
	Published:	2026-07-24 02:33 UTC
	Forecaster:	042/025

During the last week, solar activity was moderate on 26-27, 30 Jul, and low for the rest of the time. Eleven sunspot active regions (AR4489, AR4492-AR4501) were on the visible disk with three M-class flares produced. The greater than 10 MeV proton flux at geosynchronous orbit reached the level of a minor solar proton event on 30, 31 Jul and the maximum proton flux reached 18.1 pfu. The F10.7 index ranged from 143 sfu to 152 sfu. Due to the continuous effect of high speed stream, the geomagnetic field was at active levels for 3 hours. It was quiet to unsettled 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 greater than 10 MeV proton flux at geosynchronous orbit will maintain at minor solar proton event levels on 31 Jul. Due to the effect of CME on 30 Jul, the geomagnetic field is expected to reach minor storm levels on 2 Aug. Due to the effect of a recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active to minor storm levels on 5-6 Aug. It will be quiet to unsettled for the rest of the time.
	Published:	2026-07-31 02:39 UTC
	Forecaster:	026/010

During the last week, solar activity was low. Ten sunspot active regions (AR4492, AR4494-AR4496, AR4498-AR4503) were on the visible disk without M-class or above flare produced. SEP ended on 31 Jul and the maximum proton flux reached 18.1 pfu. The F10.7 index decreased from 148 sfu to 101 sfu. Due to the effect of CME on 30 Jul, the geomagnetic field reached moderate storm levels for 3 hours and active levels for 18 hours on 2-4 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. The geomagnetic field is expected to be mainly quiet to unsettled with isolated active levels on 8 Aug and 11 Aug due to the effect of a recurrent coronal hole high speed stream.
	Published:	2026-08-07 01:21 UTC
	Forecaster:	012/016

During the last week, solar activity was very low on 7-8, 13 Aug and low for the rest of time. Twelve sunspot active regions (AR4498, AR4510, AR4502-AR4511) were on the visible disk without M-class or above flare produced. No SEP event occurred. The F10.7 index fluctuate between 94 sfu and 108 sfu. Due to the effect of recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 480 km/s and the geomagnetic field reached moderate storm levels for 3 hours, minor storm levels for 3 hours and active levels for 9 hours on 8-9 Aug. It was quiet to unsettled for the rest of the time.
Within the next week, solar activity is expected to be mainly low with slight chances for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled with isolated active levels on 14-15 Aug due to the effect of a coronal hole high speed stream.
	Published:	2026-08-14 00:55 UTC
	Forecaster:	039/015

During the last week, solar activity was high on 20 Aug, moderate on 19 Aug and low for the rest of time. Ten sunspot active regions (AR4503, AR4506-AR4514) were on the visible disk with 4 M-class flares produced. No SPE event occurred. The F10.7 index fluctuated between 114 sfu and 129 sfu. Due to the effect of recurrent coronal hole high speed streams, the solar wind speed reached a peak of about 630 km/s and the geomagnetic field reached minor storm levels for 9 hours, active levels for 18 hours on 17-19 Aug. It was quiet to unsettled for the rest of the time.
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 be mainly at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit will reach minor storm levels on 21-23 Aug.
	Published:	2026-08-21 01:20 UTC
	Forecaster:	012/040

During the last week, solar activity was high on 25 Aug, moderate on 21, 24 and 26 Aug and low for the rest of time. Eight sunspot active regions (AR4508, AR4513-AR4519) were on the visible disk with 8 M-class flares produced. No SPE event occurred. The F10.7 index fluctuated between 122 sfu and 143 sfu. The solar wind speed decreased from 550km/s to 250km/s. The geomagnetic field was at quiet to unsettled levels. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm levels on 22 Aug.
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 reach active levels to minor storm levels on 28 Aug due to the effects of a coronal hole high speed stream and the CME from 25 Aug. It is expected to be mainly at quiet to unsettled levels for the rest of the time.
	Published:	2026-08-28 01:10 UTC
	Forecaster:	016/042

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.