MMmotd June 2026

mmmotd@solar.physics.montana.edu

1 participants
31 discussions

MM#003 Major Flare Watch
by Max Millennium Chief Observer 30 Jun '26

30 Jun '26

Dear Collaborators, Solar activity has significantly increased since the last message. An M5.9 flare was produced by NOAA 14475 at 12:37 UT today. This region also produced an M1.3 flare and nine C-class flares. Today we will implement a Major Flare Watch campaign on NOAA 14475. It has been designated as a complex beta-gamma-delta/D-type region. Please note that NOAA 14479 (N16W19) produced an M1.4 flare and has developed to a beta-gamma-delta/E-type configuration. Additional low M-class flares are expected with a chance of another major flare (>M5) in the next few days. The position of NOAA 14475 on June 30 at 15:30 UT is: S09W58 (792", -171") See http://www.SolarMonitor.org <http://www.solarmonitor.org/> for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, Ying Li (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 29 Jun '26

29 Jun '26

Dear Collaborators, The largest event in the past 24 hours was a C9.5 flare at 06/28/21:17 UT produced by NOAA 14475 (S10W40) which has a beta-gamma/D-type configuration. The most productive region during the period was NOAA 14479 (N16W05, beta/D-type). It produced more than ten C-class flares, the largest one being a C8.7 flare. The target region NOAA 14478 only produced a C2.7 and a C4.2 flares over the past 24 hours, but it is still showing an increased current helicity and retains its beta-gamma-delta/F-type configuration. Today we will continue to watch this region. Further C-class activities are expected from various regions with some chance of an isolated low M-class flare in the next few days. The position of NOAA 14478 on June 29 at 11:30 UT is: S06E13 (-211", -141") See http://www.SolarMonitor.org <http://www.solarmonitor.org/> for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, Ying Li (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 28 Jun '26

28 Jun '26

Dear Collaborators, Solar activity has increased since the last message. The largest event during the period was a C7.5 flare at 21:06 UT yesterday from NOAA 14475 (S10W26, beta-gamma/D-type). NOAA 14475 became the most flare-productive region during the period, producing five additional low C-class flares. The target region NOAA 14478 (S06E26, beta-gamma- delta/F-type) produced only a C2.1 flare but remains the largest and most magnetically complex region on the visible disk. Today, the target region will remain NOAA 14478, as it is showing ongoing significant flux emergence. Further C-class activity is expected, with a slight chance of an isolated low M-class flare in the next 24 hours. The position of NOAA 14478 on 28-Jun-2026 11:30 UT is: S06E26 (-412", -136") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 27 Jun '26

27 Jun '26

Dear Collaborators, Solar activity remains low since the last message. The largest event during the period was a C3.9 flare at 09:08 UT today from NOAA 14475 (S09W13, beta-gamma/D-type), which also produced a C3.1 flare later in the period. The target region NOAA 14478 (S06E39, beta-gamma-delta/F-type) produced several low C-class flares and remains the largest and most magnetically complex region on the visible disk. Continued significant flux emergence is still visible in NOAA 14478, especially in its central part. Today, we will continue with NOAA 14478 as the target region. Further C-class activity is expected, with a chance of an isolated low M-class flare in the next 24 hours. The position of NOAA 14478 on 27-Jun-2026 11:30 UT is: S06E39 (-592", -130") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 26 Jun '26

26 Jun '26

Dear Collaborators, Solar activity has slightly increased since the last message. The largest event during the period was a C6.6 flare at 14:53 UT yesterday from the target region NOAA 14478 (S06E56). 14478 has increased in magnetic complexity to a beta-gamma-delta configuration and produced several additional C-class flares in the period, including C5.8 and C5.0 events. Today, we will continue with NOAA 14478 as the target region, as it is showing significant magnetic flux emergence. Further C-class activity is expected, with a chance of an isolated low M-class flare in the next 24 hours. The position of NOAA 14478 on 26-Jun-2026 11:30 UT is: S06E56 (-779", -120") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 25 Jun '26

25 Jun '26

Dear Collaborators, Solar activity remains low since the last message. The largest event during the period was a C4.3 flare at 00:15 UT today from the limb target region. This region is now numbered as NOAA 14478 (S06E68). This region produced several additional C-class flares during the period, including C3.8 and C4.0 flares, and is classified as a beta-gamma/F-type sunspot group. NOAA 14475 (S09E14, beta-gamma/C-type) also produced five low C-class flares. Today, we will continue with NOAA 14478 as the target region, due to its significant ongoing magnetic flux emergence. Further C-class activity is expected, with only a chance of an isolated low M-class flare in the next 24 hours. The position of NOAA 14478 on 25-Jun-2026 at 11:30 UT is: S06E68 (-871", -112") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 24 Jun '26

24 Jun '26

Dear Collaborators, Solar activity has increased since the last message. The largest event during the period was a C8.7 flare at 23:18 UT yesterday, produced by an eastern limb region (S06E78; not yet numbered). This limb region also produced more than ten additional C-class flares during the period, including a C6.0 flare. Yesterday's target region, NOAA 14475 (S09E31, beta-gamma/C-type), produced several low C-class flares, including a C3.5 flare. Today, the target will switch to the eastern limb region. Further C-class activity is expected, with only a slight chance of an isolated low M-class flare in the next 24 hours. The approximate position of the target region on 24-Jun-2026 at 11:30 UT is: S06E78 (-919", -106") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#009 Default Target
by Max Millennium Chief Observer 23 Jun '26

23 Jun '26

Dear Collaborators, Solar activity has remained at a very low level since the last message, with the GOES 1–8 A flux mostly flat near C1. These low C-class events came mainly from yesterday's target region NOAA 14473 (S09E33, beta- gamma/D-type), newly numbered NOAA 14475 (S09E44, beta-gamma/ C-type; formerly the trailing main sunspot of 14473), and two eastern limb regions. NOAA 14473 has decayed significantly, with a rapid decrease in both sunspot number and sunspot area. At this time, we are ending the Major Flare Watch. The default target will switch to NOAA 14475, as it is showing relatively active flux emergence on the eastern side of its main sunspot. Further low C-class activity is expected, with only a slight chance of an isolated M-class flare in the next 24 hours. The position of NOAA 14475 on 23-Jun-2026 11:30 UT is: S09E44, (-649", -171") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#003 Major Flare Watch
by Max Millennium Chief Observer 22 Jun '26

22 Jun '26

Dear Collaborators, Solar activity has decreased to a low level since the last message. The largest event during the period was a C2.6 flare at 22:30 UT yesterday from the target region NOAA 14473 (S08E49). 14473 has increased in magnetic complexity to a beta-gamma/E-type, with continued magnetic flux emergence and mixed polarity around its leading sunspots. Today, the Major Flare Watch will remain with NOAA 14473 for a further 24 hours. Further C-class activity is expected, with a chance of an isolated >M5 flare in the next 24 hours. The position of NOAA 14473 on 22-Jun-2026 11:30 UT is: S08E49, (-707", -151") See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, De-Chao Song (Purple Mountain Observatory)

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MM#003 Major Flare Watch
by Max Millennium Chief Observer 21 Jun '26

21 Jun '26

Dear Collaborators, An M7.0 flare was produced by the target region, NOAA 14473 at 19:17 UT today(6/21). At this time, we will implement the Major Flare Watch campaign with NOAA 14473. In the next 24 hours, we will observe the area of leading sunspots where the M7.0 flare was initiated. Additional M-class activities are expected with a chance of another major event(>M5). The position of the target in NOAA 14473 on 21-Jun-2026 at 22:00 UT is: S08E53 (-753.", -154"). See http://www.SolarMonitor.org for images and http://solar.physics.montana.edu/max_millennium/ops/observing.shtml for a description of the current Max Millennium Observing Plan. Regards, Aki Takeda (Montana State University) --

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MMmotd June 2026