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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was low. Six active sunspot regions were on the visible disk without any M-class flares produced. The solar wind speed maintained at about 510 km/s. The geomagnetic field was quiet to unsettled. 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 low to moderate with a chance for M-class flares. The geomagnetic field is expected to reach active to minor storm levels on 19 May due to the CME produced on 16 May, and be mainly quiet to unsettled on 20-21 May. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels.
	Published:	2026-05-19 00:02 UTC
	Forecaster:	027/026

During the past 24 hours, solar activity was low. Five active sunspot regions were on the visible disk without any M-class or above flares produced. Due to the CME from 16 May, the solar wind speed increased to about a peak of 630 km/s. The geomagnetic field reached active levels for 12 hours, quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit reached minor storm level.
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 20-21 May and reach isolated active levels on 22 May due to the effect of a recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels.
	Published:	2026-05-20 00:00 UTC
	Forecaster:	026/010

During the past 24 hours, solar activity was low. Four active sunspot regions were on the visible disk without any M-class or above flares produced. The solar wind speed decreased to about 450 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 slight chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled on 21 May and reach isolated active levels on 22-23 May due to the effect of a recurrent coronal hole high speed stream.
	Published:	2026-05-20 23:15 UTC
	Forecaster:	010/042

During the past 24 hours, solar activity was low. Five sunspot active regions were on the visible disk without any M-class or above flares produced. The solar wind speed decreased to about 390 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 low with a slight chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled with isolated active conditions on 22-23 May due to the effect of a recurrent coronal hole high speed stream.
	Published:	2026-05-21 23:16 UTC
	Forecaster:	042/012

During the past 24 hours, solar activity was moderate. Four sunspot active regions were on the visible disk with one M-class flare produced. The solar wind speed maintained at about 370 km/s. The geomagnetic field was at quiet to unsettled levels. 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 mainly low with a slight chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels on 23 May.
	Published:	2026-05-22 23:21 UTC
	Forecaster:	012/040

During the past 24 hours, solar activity was low. Six sunspot active regions were on the visible disk without M and above class flare produced. The solar wind speed maintained at about 330 km/s. The geomagnetic field was at quiet to unsettled levels. 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 mainly low with a slight chance for M-class flares. The geomagnetic field is expected to be mainly quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels on 23 May.
	Published:	2026-05-23 23:12 UTC
	Forecaster:	040/025

During the past 24 hours, solar activity was low. Six sunspot active regions were on the visible disk without M-class or above flare produced. The solar wind speed maintained at about 320 km/s. The geomagnetic field was quiet. 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 mainly low with a slight chance for M-class flares. The geomagnetic field is expected to reach isolated active levels due to the effect of a recurrent coronal hole high speed stream and will be mainly quiet to unsettled for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels on 25-26 May.
	Published:	2026-05-24 23:01 UTC
	Forecaster:	025/039

WEEKLY REPORTS

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During the last week, solar activity was high on 4 Apr, moderate on 3 Apr and 9 Apr, and low on other time. 13 active sunspot regions (AR4399, AR4403-AR4409, AR4411-AR4415) were on the visible disk with 7 M-class flares produced. No solar proton event occurred. The F10.7 index decreased from 136 sfu to 98 sfu. Due to the effect of the CME from 1 Apr and the coronal hole high speed stream, the solar wind speed reached a peak value of about 850 km/s and the geomagnetic field reached major storm levels for 3 hours, moderate storm levels for 6 hours, minor storm levels for 6 hours, and active levels for 21 hours on 3-5 Apr. The geomagnetic field was quiet to unsettled for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit was at minor storm levels on 5-9 Apr.
Within the next week, solar activity is expected to be mainly low with chance for M-class flares. Due to the effects of the recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active or minor storm levels on 10-11 Apr. It will be quiet to unsettled for the rest of the time.
	Published:	2026-04-10 03:36 UTC
	Forecaster:	027/026

During the last week, solar activity was low on 11-13 and 16 Apr, and very low on the other days. 6 active sunspot regions (AR4414-AR4419) were on the visible disk without any M-class or above flare produced. No solar proton event occurred. The F10.7 index increased from 94 sfu to 108 sfu. Due to the effect of a coronal hole high speed stream, the solar wind speed reached a peak value of about 650 km/s between 10 and 11 Apr, and the geomagnetic field was at active levels for 12 hours. 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 15 Apr.
Within the next week, solar activity is expected to be mainly low with a chance for M-class flares. Due to the effects of another recurrent coronal hole high speed stream, the geomagnetic field is expected to reach active to storm levels on 17-20 Apr, and quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 20-23 Apr.
	Published:	2026-04-17 01:48 UTC
	Forecaster:	040/022

During the last week, solar activity was very low on 19 Apr, high on 23 Apr, and low on the other days. Six active sunspot regions (AR4415-AR4416, AR4419-AR4422) were on the visible disk with five M-class flares produced. No solar proton event occurred. The F10.7 index increased from 105 sfu to 128 sfu. Due to the effects of several recurrent coronal hole high speed streams, the solar wind speed reached a peak value of about 580 km/s, and the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 18 hours, and active levels for 30 hours on 18-21 Apr. 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 17, 22-23 Apr.
Within the next week, solar activity is expected to be mainly moderate with a chance for M-class above flares. The geomagnetic field is expected to be mainly quiet to unsettled. It is expected to reach isolated active to minor storm levels on 25-27 Apr due to the effect of the recurrent coronal hole high speed stream. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 24 Apr.
	Published:	2026-04-24 00:57 UTC
	Forecaster:	041

During the last week, solar activity was high on 24, 26 Apr, and moderate on 25, 27-28 Apr and low on the other days. Eleven active sunspot regions (AR4419-AR4429) were on the visible disk with two X-class and fourteen M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 143 sfu to 156 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached about 460km/s and the geomagnetic field reached active levels on 24. Due to the effect of another recurrent coronal hole high speed stream, the solar wind speed reached about 510km/s and the geomagnetic field reached minor storm levels for 3 hours, active levels for 3 hours on 30 Apr. 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 24 Apr.
Within the next week, solar activity is expected to be low to moderate with a chance for M-class above flares. The geomagnetic field is expected to be mainly quiet to unsettled. It is expected to reach isolated active to minor storm levels on 1, 7 May due to the effects of the recurrent coronal hole high speed streams.
	Published:	2026-05-01 02:25 UTC
	Forecaster:	027/010

During the last week, solar activity was moderate on 4 and 7 May and low on the other days. Twelve sunspot active regions (AR4420, AR4423-AR4425, AR4428-4435) were on the visible disk with two M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 117 sfu to 159 sfu. Due to the continuous effect of a recurrent coronal hole high speed stream, the solar wind speed reached about 520km/s and the geomagnetic field reached active levels for six hours on 1 May. Due to the effect of a CME, the solar wind speed reached a peak of about 450km/s and the geomagnetic field reached moderate storm levels for 3 hours, minor storm levels for 6 hours, active levels for 3 hours during 4-5 May. 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 a chance for M-class above flares. The geomagnetic field is expected to be mainly quiet to unsettled. It is expected to reach isolated active levels on 8 May due to the effect of a recurrent coronal hole high speed stream.
	Published:	2026-05-08 01:39 UTC
	Forecaster:	022/042

During the last week, solar activity was high on 10 May and low on the other days. Eleven sunspot active regions (AR4431-AR44236, AR4438) were on the visible disk with one M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 103 sfu to 126 sfu. The solar wind speed reached a peak of 600 km/s on 8 May. The geomagnetic field was quiet to unsettled.
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 storm levels on 15-16 May and isolated active levels on 17-18 May due to the effect of a recurrent coronal hole high speed stream. It is expected to be quiet to unsettled levels for the rest of the time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to reach minor storm levels on 19-21 May.
	Published:	2026-05-15 01:43 UTC
	Forecaster:	040/015

During the last week, solar activity was moderate on 16-17 May and low on the other days. Nine sunspot active regions (AR4435-AR4436, AR4438-AR4444) were on the visible disk with four M-class flares produced. No solar proton event occurred. The F10.7 index ranged from 101 sfu to 118 sfu. Due to the effect of a recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 730km/s, and the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 15 hours and active levels for 9 hours on 15-16 May. Due to the effect of a CME on 16 May, the solar wind speed reached a peak of about 630km/s and the geomagnetic field reached active levels for 12 hours on 19 May. 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 17-19 May and 21 May.
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 isolated active levels on 22-23 May and isolated active to minor storm levels on 27-28 May due to the effect of a recurrent coronal hole high speed stream. It is expected to be quiet to unsettled for the rest of the time.
	Published:	2026-05-22 01:51 UTC
	Forecaster:	012/042

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.