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ARCHIVE

DAILY REPORTS

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During the past 24 hours, solar activity was low. Seven sunspot regions were on the visible disk with several C-class flares produced. The solar wind speed maintained at about 430 km/s. The geomagnetic field was at quiet 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 moderate. The geomagnetic field is expected to be mainly quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 28-29 May.
	Published:	2023-05-27 23:15 UTC
	Forecaster:	039/029

During the past 24 hours, solar activity was moderate. Seven sunspot regions were on the visible disk with one M1 and several C-class flares produced. The solar wind speed maintained at about 430 km/s. The geomagnetic field was at quiet to unsettled levels.
Within the next three days, solar activity is expected to be mainly moderate with a chance for X-class flares. The geomagnetic field is expected to be mainly quiet to unsettled.
	Published:	2023-05-28 22:58 UTC
	Forecaster:	010/037

During the past 24 hours, solar activity was low. Ten sunspot regions were on the visible disk without M-class flares produced. The solar wind speed maintained at about 380 km/s. The geomagnetic field was quiet.
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:	2023-05-29 22:50 UTC
	Forecaster:	042/010

During the past 24 hours, solar activity was moderate. Ten sunspot regions were on the visible disk with three M1 flares produced. The solar wind speed maintained at about 380 km/s. The geomagnetic field was quiet.
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 quiet to unsettled on 31 May and 1 Jun, and to reach isolated active levels on 2 Jun due to the recurrent coronal hole high speed stream.
	Published:	2023-05-30 23:04 UTC
	Forecaster:	010/042

During the past 24 hours, solar activity was moderate. Ten sunspot regions were on the visible disk with four M-class flares produced. The solar wind speed increased to about 400 km/s. The geomagnetic field was quiet to unsettled.
Within the next three days, solar activity is expected to be moderate with a slight chance for X-class flares. The geomagnetic field is expected to be quiet to unsettled on 1 Jun, and to reach isolated active levels on 2-3 Jun due to the recurrent coronal hole high speed stream.
	Published:	2023-05-31 22:48 UTC
	Forecaster:	042/012

During the past 24 hours, solar activity was low. Ten sunspot regions were on the visible disk without M-class and above flares produced. The solar wind speed reached a peak of about 470 km/s. The geomagnetic field reached active levels for 3 hours and quiet to unsettled levels for the rest of the time.
Within the next three days, solar activity is expected to be moderate with a slight chance for X-class flares. The geomagnetic field is expected to reach isolated active levels on 2-3 Jun due to the recurrent coronal hole high speed stream and it is expected to be quiet to unsettled on 4 Jun.
	Published:	2023-06-01 23:26 UTC
	Forecaster:	012/041

During the past 24 hours, solar activity was moderate. Ten sunspot regions were on the visible disk with one M1 flare produced. The solar wind speed decreased to about 360 km/s. The geomagnetic field was at quiet levels.
Within the next three days, solar activity is expected to be mainly moderate with a chance for M-class flares. The geomagnetic field is expected to reach isolated active levels on 3-4 Jun due to the recurrent coronal hole high speed stream and it is expected to be quiet to unsettled on 5 Jun.
	Published:	2023-06-02 22:52 UTC
	Forecaster:	041/026

WEEKLY REPORTS

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During the last week, solar activity was moderate on 14 Apr and low for the rest of the time. Ten active sunspot regions (3272-3273,3275-3276, 3279-3284) were on the visible disk with two M-class and 61 C-class flares produced, the M-class flares were produced by region 3282. No solar proton events happened. The F10.7 index ranged between 147 sfu and 178 sfu. Due to the effect of the CME, the solar wind speed reached a peak of about 630 km/s and the geomagnetic field reached active levels for 15 hours on 18-19 Apr. It was quiet to unsettled levels for the rest of the time.
Within the next week, solar activity is expected to be mainly low with a chance for M-class solar flares. Due to the effect of two recurrent coronal hole high speed streams, the geomagnetic field is expected to reach active levels on 22-23 Apr and 26-27 Apr, it will be mainly quiet to unsettled levels for the rest of the time.
	Published:	2023-04-21 05:30 UTC
	Forecaster:	039/040

During the last week, solar activity was moderate on 21 Apr and 27 Apr and low for the rest of the time. Fourteen active sunspot regions (AR3275,AR3279,AR3281-3292) were on the visible disk with two M-class and several C-class flares produced. The greater than 10 MeV proton flux at geosynchronous orbit reached solar proton event levels on 23 Apr with the maximum of 26 pfu. The F10.7 index ranged between 131sfu and 151 sfu. Due to the effects of the CME and the coronal hole high speed stream, the solar wind speed reached a peak of about 700 km/s. The IMF Bz reached a minimum value of -33 nT. The geomagnetic field reached major storm levels for 15 hours, moderate storm levels for 3 hours, minor storm levels for 6 hours, and active levels for 6 hours on 23-24 Apr. The geomagnetic field reached active levels for 15 hours on 26-27 Apr due to the effects of the coronal hole high speed stream and the CME from 24 Apr. It 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 26 Apr.
Within the next week, solar activity is expected to be low to moderate with a chance for M-class solar flares. Due to the continuous effects of the coronal hole high speed stream and the CME from 24 Apr, the geomagnetic field is expected to reach active to storm levels on 28-30 Apr, it will be mainly quiet to unsettled levels for the rest of the time.
	Published:	2023-04-28 03:06 UTC
	Forecaster:	029/039

During the last week, solar activity was high on 1 and 3 May, moderate on 30 Apr and 4 May and low for the rest of the time. Thirteen active sunspot regions (AR3285-3286, AR3288-3289, AR3291-3299) were on the visible disk with nine M-class and several C-class flares produced. No solar proton events happened. The F10.7 index ranged between 148sfu and 162sfu. Due to the effect of the recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 700 km/s. The geomagnetic field reached active levels for 18 hours on 28-29 Apr. Due to the effect of another recurrent coronal hole high speed stream, the solar wind speed reached a peak of about 500 km/s. The geomagnetic field reached active levels for 3 hours on 1 May. It 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 28 Apr-4 May.
Within the next week, solar activity is expected to be low to moderate with a chance for M-class solar flares. Due to the effects of the coronal hole high speed stream and CME from 4 May, the geomagnetic field is expected to be at active to minor storm levels on 6-7 May and at quiet to unsettled levels for the rest of time. The greater than 2 MeV electron flux at geosynchronous orbit is expected to maintain at minor storm levels on 5 May.
	Published:	2023-05-05 00:14 UTC
	Forecaster:	026/041

During the last week, solar activity was high on 9 May, low on 6 May and moderate for the rest of time. Nine active sunspot regions (AR3293-3294, AR3296-3297, AR3299-3303) were on the visible disk with thirteen M-class and several C-class flares produced. Minor solar proton events happened during 8-11 May with the maximum of 83 pfu. The F10.7 index ranged between 162sfu and 180sfu. Due to the effect of the coronal hole high speed stream and the CME on 2 May, the solar wind speed reached a peak of about 550 km/s on 6 May. The geomagnetic field reached moderate levels for 3 hours, minor storm levels for 3 hours, active levels for 9 hours. Due to the effect of the CME on 5 May, the solar wind speed reached a peak of about 540 km/s during 7-8 May. The geomagnetic field reached minor storm levels for 3 hours, active levels for 9 hours. Due to the effect of the CME on 7 May, the solar wind speed reached a peak of about 670 km/s during 9-10 May. The geomagnetic field reached minor storm levels for 9 hours, active levels for 6 hours. It 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 5 May.
Within the next week, solar activity is expected to be low to moderate with a chance for M-class solar flares. Due to the effect of the CME on 9 May, the geomagnetic field is expected to be at active to storm levels on 12 May and at quiet to unsettled levels for the rest of time.
	Published:	2023-05-12 00:21 UTC
	Forecaster:	010/042

During the last week, solar activity was high on 18 May, moderate on 16 May and low for the rest of time. Fifteen active regions (AR3293-3294, AR3296-3297, AR3230-3302, AR3234-3311) were on the visible disk with six M-class and several C-class flares produced. No solar proton events happened. The F10.7 index ranged between 134sfu and 151sfu. Due to the effect of CME on 9 May, the solar wind speed reached a peak of about 570 km/s on 12-13 May, the geomagnetic field reached minor storm levels for 3 hours and active storm levels for 9 hours. It was at quiet to unsettled levels 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 solar flares. Due to the effect of coronal high speed stream, the geomagnetic field is expected to be at active to minor storm levels on 24-25 May and at quiet to unsettled levels for the rest of time.
	Published:	2023-05-19 00:04 UTC
	Forecaster:	010/037

During the last week, solar activity was high on 19-20 May and moderate for the rest of time. Eleven active regions (AR3302, AR3305, AR3307-3315) were on the visible disk with 21 M-class and 92 C-class flares produced. No solar proton events happened. The F10.7 index ranged between 154sfu and 170sfu. Due to the effect of CME, the solar wind speed reached a peak of about 600 km/s on 19-20 May, the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 3 hours and active storm levels for 9 hours. Due to the effect of CME from 17 May, the solar wind speed increased to about 630km/s on 21-22 May, and the geomagnetic field reached moderate storm levels for 6 hours, minor storm levels for 3 hours and active storm levels for 9 hours. Due to the coronal hole high speed stream, the geomagnetic field reached active levels for 3 hours. It 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 24-25 May.
Within the next week, solar activity is expected to be mainly moderate with a chance for M-class solar flares. The geomagnetic field is expected to be mainly quiet to unsettled. The greater than 2 MeV electron flux at geosynchronous orbit will maintain at minor storm levels on 26-27 May.
	Published:	2023-05-26 02:00 UTC
	Forecaster:	027/040

During the last week, solar activity was moderate on 26, 28, 30-31 May and low for the rest of the time. Fourteen active regions (AR3310-3323) were on the visible disk with 8 M-class and 62 C-class flares produced. No solar proton events happened. The F10.7 index increased from 149sfu to 164sfu. The solar wind speed increased to about 480km/s on 1 Jun, the geomagnetic field reached active levels for 3 hours. It 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 26-27 May.
Within the next week, solar activity is expected to be mainly moderate with a chance for M-class and above solar flares. Due to the effect of the recurrent coronal high speed stream, the geomagnetic field is expected to reach isolated active levels on 2-3 Jun, mainly quiet to unsettled levels for the rest of the time.
	Published:	2023-06-02 00:17 UTC
	Forecaster:	012/041

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.