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)
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)
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)
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)
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)
--
Dear Collaborators,
Solar activity has increased to a moderate level. Yesterday's target
rotated from the Southeast limb produced two M class flares since the
last message: a M1.0 at 14:54 UT yesterday(6/20) and a M2.6 at 2:25 UT
today, the latter was the largest event in the period. This region,
now assigned to NOAA 14473, is also the source of several high-B to
mid-C class events in the last 24 hours. The leading (Western) portion
of this region consists of multiple small spots with mixed polarity,
while the Eastern portion appears to be a single large spot with
negative polarity (still too close to the limb to describe further).
Today, we will continue to observe NOAA 14473 at the leading portion
of sunspots where the M2.6 flares are from. Additional C class to
low-M class events are expected.
The position of the target in NOAA 14473 on 21-Jun-2026 at 15:30 UT is:
S08E57 (-790.", -155").
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)
--
Dear Collaborators,
Solar activity has slightly increased since the last message due to
the activities from the regions rotated from the Southeast limb.
The largest event in the period was an M1.3 flare at 01:26 UT today
(6/20) from the region rotated from the Southeast limb yesterday,
now assigned the number, NOAA 14472. There is another region rotated
from the limb at the latitude of ~8 degrees South, which has been
our default target since yesterday. This yet-unnumbered region
produced several flares including 2 C1.9 flares (at 11:15 UT and
another at 12:06 UT) today, while NOAA 14472 has kept quiet after
the M1.3 flare.
Today, we will continue to observe the unnumbered region from the
Southeast limb at ~8 degrees South, expecting additional C class
activities.
The position of the target from the Southeast limb on 20-Jun-2026 at
15:00 UT is: S08E75 (-901.", -149").
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)
--
Dear Collaborators,
Solar activity remains low since the last message. The largest event
in the 24 hours was a C1.3 flare at 21:49 UT yesterday (6/18) from
behind the Southeast limb at ~9 degrees. Several high-B class events
were reported from the regions behind the Southeast limb extended
from 5 to 25 degrees South. A small sunspot rotated from the limb at
~13 degrees South but so far not showing flare activity.
NOAA 14465 approaching the Southwest limb produced 3 high-B class
flares, while yesterday's target, NOAA 14470 has been flare-quiet in
the last 24 hours with slightly decreased sunspot area.
Today, we will observe the Southeast limb region, the current brightest
area at ~8 degrees South, as the default target. Additional high-B to
low-C class flares are expected.
The position of the target on the Southeast limb on 19-Jun-2026 at
16:00 UT is: S08E84 (-929.", -143").
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)
--
Dear Collaborators,
Solar activity continues to be low since the last message.
The largest event in the period was a C2.0 flare at 11:42 UT today
(6/18) produced by NOAA 14470. This region is also the source of
another C class flare (C1.0 at 07:38 UT) and several B-class events
in the last 12 hours. Yesterday's target, NOAA 14465 only produced
two high-B class flares. A newly emerged bi-polar sunspots in the
Northeast quadrant is not assigned a number yet, but produced two
B class flares yesterday.
Today, we will switch the target back to NOAA 14470 due to the recent
flare history. We will observe the area of its following sunspots
with mixed polarity. Additional high-B to low-C class events are
expected.
The position of the target in NOAA 14470 on 18-Jun-2026 at
16:00 UT is: N07E48 (-699", 108").
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)
--
Dear Collaborators,
Solar activity remains at a low level since the last message.
The largest event in the period is a C2.5 flare at 14:57 UT
today(6/17) from NOAA 14464 behind the Southwest limb.
Yesterday's target from the Northeast limb was assigned a number,
NOAA 14470 and classified as a beta type. This region appears to
have settled slightly and has been flare-quiet in the last 24 hours.
The previous target, NOAA 14465 is showing a sign of further decay
but has produced a few high-B to low-C class flares since the last
message. Today, we will switch the target back to NOAA 14465 to
observe further activities during its decaying process. Additional
high-B to low-C class events are expected.
The position of the target in NOAA 14465 on 17-Jun-2026 at
16:00 UT is: N06W43 (643", 93").
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)
--