MMmotd September 2023

mmmotd@solar.physics.montana.edu

1 participants
30 discussions

MM#009 Default Target
by Max Millennium Chief Observer 30 Sep '23

30 Sep '23

Dear Collaborators, Solar activity is at a low-to-intermediate level. Yesterday's target NOAA 13450 (S19E39) only produced a C1.9 flare in the period, although it was classified as a beta-gamma/E-type sunspot region. A newly emerged region (unnumbered yet) near the North East limb was the most flare-productive region with being the source of ten C-class flares, including two ~C7 flares that erupted at 09/29/18:11 UT and 09/30/03:57 UT respectively. This region continues to undergo flux emergence and shall be the new target. Besides, NOAA 13445 (S14W69, beta/C-type) also produced four C-class flares, including the largest magnitude flare in the period - a C8.0 at 09/30/05:56 UT, but showing signs of decay. Further C-class flares are expected over the next 24-hour period, with a slight chance of low M-class activities. The approximate position of the target on 30-Aug-2023 at 11:00 UT is: N11E68 (-760", 150") 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 29 Sep '23

29 Sep '23

Dear Collaborators, Solar activity is at a low level. The largest event since the last message was a C3.1 flare at 13:56 UT yesterday from the target region NOAA 13450 (S19E54, beta/D-type), which has increased in terms of spot area and number of spots and produced another two ~C2 flares in the period. Today the target shall still be this region. Please note that NOAA 13445 (S14W53, beta/D-type) produced five low-C flares in the period, but decreased significantly in number of spots. Additional low C-class flares are expected in the following 24-hour period. The position of NOAA 13450 on 29-Sep-2023 at 07:30 UT is: S19E54 (-733" , -373") 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 28 Sep '23

28 Sep '23

Dear Collaborators, Solar activity has been at intermediate levels since the last message. The largest event in the period was an M1.3 flare at 08:58 UT today from a newly numbered region NOAA 13450 (S18E59, beta/C-type) that recently rotated on disk over the South East limb. 13450 was the most flare-productive region, which also produced six C-class flares in the period. Yesterday's target region NOAA 13445 (S13W44, beta/D-type) was quiescent in the past 24 hours. Today the target region shall switch from NOAA 13445 to NOAA 13450. Additional C-class flares are expected over the next 24 hours, with a chance for low M-class flares. The position of NOAA 13450 on 28-Sep-2023 at 11:30 UT is: S18E59 (-781" , -350") 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 Sep '23

27 Sep '23

Dear Collaborators, Solar activity is at a low level. The largest event was a C4.7 flare at 05:35 UT today produced by a South East limb region (unnumbered yet, S21E86). Target region NOAA 13445 produced two low-to-mid flares (C4.3 and C3.2) in the period. This region has increased slightly in number of spots since the last message, but has decreased in magnetic classification to be a beta-gamma/D-type sunspot group. NOAA 13445 will remain the target region for a further 24 hours. Please note that a newly-numbered NOAA region 13449 (N15E40, beta-gamma/C-type) also produced four low C-class flares in the period. Additional C-class flares are expected over the following 24-hour period, with a slight chance of low M-class activities. The position of NOAA 13445 on 27-Sep-2023 at 11:30 UT is: S13W30 (467" , -311") 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 Sep '23

26 Sep '23

Dear Collaborators, The level of solar activity is low-to-moderate. Target region NOAA 13445 has become more fragmented since the last message and retained its beta-delta/D-type magnetic configuration. 13445 continued to be the most flare-productive region with being the source of eleven C-class flares, including the largest magnitude event in the period (a C5.7 on 26-Sep-2023 at 04:22 UT). NOAA 13445 shall continue as the target region. Additional C-class flares are expected over the following 24-hour period, with a slight chance of low M-class activities. The position of NOAA 13445 on 26-Sep-2023 at 07:30 UT is: S14W13 (209" , -340") 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 Sep '23

25 Sep '23

Dear Collaborators, Solar activity has diminished over the past 24 hours. The largest event in the period was an M1.0 flare at 14:51 UT yesterday produced by NOAA 13443 (N28W75, beta-gamma/E-type). Target region NOAA 13445 (S14W02) has grown slightly in spot area and increased in magnetic complexity since the last message, which has been classified as a beta-delta/D-type sunspot group. It remained the most flare-productive region with being the source of twelve C-class flares. NOAA 13445 shall continue as the target region, although we are ending the Major Flare Watch at this time. If possible, please also include a newly emerged region (S22E18) near the target in the field of view. This region has just produced a C9.9 flare and is still experiencing the emergence of new magnetic fluxes. Additional C-class flares are expected over the following 24-hour period, with a chance for low M-class flares. The position of NOAA 13445 on 25-Sep-2023 at 11:30 UT is: 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 24 Sep '23

24 Sep '23

Dear Collaborators, Solar activity has remained at a moderate level over the past 24 hours. Yesterday's target NOAA 13443 (N28W61) only produced 4 low-C flares although it was classified as a beta-delta/D-type sunspot region. The largest event since the last message was an M4.4 flare at 03:17 UT today from NOAA 13445 (S15E12, beta/D-type). 13445 has increased significantly in terms of spot area and number of spots in the period and produced another two M1 (M1.2 and M1.9) and fourteen C-class flares in the period. Today the Major Flare Watch region will switch to NOAA 13445 due to its high frequency of flaring and current helicity. Please note that a region behind the northwest limb (possibly NOAA 13436) produced an occulted M1.6 flare at 20:14 UT yesterday. Sustained intermediate level activities are expected, with a chance for above M5 flares over the next 24 hours. The position of NOAA 13445 on 24-Sep-2023 at 11:30 UT is: S15E12 (-192" , -357") 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 23 Sep '23

23 Sep '23

Dear Collaborators, The level of solar activity is moderate. Yesterday's target NOAA 13435 (N09W04, beta/D-type) only produced one C7.3 flare in the period while NOAA 13443 (N28W47) was the source of three M1 flares, the largest of which was an M1.9 on 22-Sep-2023 at 22:25 UT. The Major Flare Watch shall remain in effect, but the target shall switch from NOAA 13435 to NOAA 13443. The new target is classified as a beta-gamma region and continues to develop due to flux emergence in its edges. Please note that NOAA 13445 (S15E26, beta/D-type) also produced eight C-class flares in the period, and NOAA 13437 (S18W76, beta/D-type) produced a C9.9 flare on 22-Sep-2023 at 19:20 UT. Low M-class activities are still expected over the following 24 hours, with a slight chance of an above M5 flare. The position of NOAA 13443 on 23-Sep-2023 at 11:30 UT is: N28W47 (618" , 375") 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 Sep '23

22 Sep '23

Dear Collaborators, Solar activity continues at a high level for the past 24 hours. The largest event since the last message was an M8.7 flare at 12:42 UT yesterday produced by the target region NOAA 13435 (N08E12). 13435 also produced another M1.2 flare at 02:25 UT today and has retained its beta-delta/D-type magnetic configuration. We shall continue with the Major Flare Watch in effect with NOAA 13435 as the target region. Additional low M-class flares are expected with a chance of another >M5 flare in the next few days. The position of NOAA 13435 on 22-Sep-2023 at 07:30 UT is: N08E12 (-197" , 18") 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 Sep '23

21 Sep '23

Dear Collaborators, Solar activity is at a high level. The largest event since the last message is an M8.2 flare at 14:11 UT yesterday from the target region NOAA 13435, which has retained its beta-delta/D-type magnetic configuration and shall remain the target region. Moreover, the nearby region NOAA 13438 (N10E16, beta/C-type) also produced six low-to-moderate C-class flares in the period. As such we are implementing a Major Flare Watch campaign at this time. More C-class flares are expected over the following 24-hour period, with a good chance of additional M-class activity. The position of NOAA 13435 on 21-Sep-2023 at 07:30 UT is: N09E25 (-400" , 42") 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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MMmotd September 2023