Dear Collaborators,
Solar activity has declined to a low level since the last message.
The largest event in the past 24 hours was a C3.7 flare at 6:36 UT
today(10/21) from behind the Northeast limb. Yesterday's target,
NOAA 14248 on the West limb produced 3 low-C class flares but the
loop system is going out of our view today.
There were a few low-C class activities from the Southeast
quadrant of the solar disk. NOAA 14257 had two leading (negative
polarity) sunspots about 50 arcsec apart in North-South direction.
Today the Southern spot was given a new number as NOAA 14262, and
this region appears to be involved in the low-C class events at
15:14 UT and 23:33 UT on 10/20. Today, we will observe this region,
NOAA 14262 as the default target, expecting additional C class events.
The position of the target in NOAA 14262 on 21-October-2025 at
15:00 UT is: S13E26 (-421", -295").
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 been at a low-to-moderate level since the last
message. The main source of activity was over the Northwestern limb,
having produced 2 M class flares in the past 24 hours; an M1.8 at
20:03 UT yesterday(10/19) from NOAA 14246 and an M1.1 at 05:10 UT
today from the target region, NOAA 14248. An unnumbered region from
the Eastern limb produced a C3.0 flare at 22:44 UT yesterday, but
it has kept quiet since then.
While the high loop system of NOAA 14246 has almost disappeared
from our view from the Earth, that of NOAA 14248 being right on the
limb is showing some dynamism. Today, we will continue to observe
NOAA 14248, at its loop system over the West limb while it rotates
behind the limb. A few C class activities are expected.
The position of the target in NOAA 14248 on 20-October-2025 at
15:30 UT is: N05W85 (956", 82").
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 is at a low level. The largest event since the last message
was an M1.0 flare at 01:46 UT today, produced by yesterday's target
region, NOAA 14246. This region also produced more than ten C-class
flares during the period and has almost passed beyond the west limb.
Today, the target shifts to NOAA 14248 (N07W73) given its recent flare
history. Further C-class activity is expected, with a slight chance of a
low
M-class flare in the next 24 hours.
The position of NOAA 14248 on 19-October-2025 at 11:30 UT is:
N07W73, (915",89")
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 been at a low-to-moderate level since the last message.
NOAA 14246 (N24W88) remains the most flare-productive region during
the period, producing several C-class flares and 10 ~M1 flares, including
the largest event, an M1.5 at 10:37 UT today. NOAA 14246 will remain
the target region until it fully rotates beyond the west limb. Note that
NOAA
14256 (S15E45, beta/C-type) also produced two ~M1 flares in the period.
C-class activity is expected, with a chance of additional low M-class
events
in the next 24 hours.
The position of NOAA 14246 on 18-October-2025 at 11:30 UT is:
N24W88, (879",386")
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 further since the last message. NOAA
14246 (N24W76) remains the most flare-productive region on the
visible disk, producing more than 20 C-class and six low M-class
flares during the period, including the largest event, an M1.5 at 01:15
UT today. We are ending the Major Flare Watch but will continue to
monitor NOAA 14246 as the target region. Additional C-class activity
is expected in the next 24 hours, with a chance of low M-class events.
The position of NOAA 14246 on 17-October-2025 at 11:30 UT is:
N24W76, (853",368")
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 slightly since the last message. NOAA
14246 (N22W63) remains in a beta-gamma-delta configuration and
is still the most flare-productive region on the visible disk. It produced
a number of C-class flares and four low-M-class flares during the
period, including the largest event, an M2.7 at 21:55 UT yesterday
(see the SSW Latest Events entry
<https://www.lmsal.com/solarsoft/latest_events/#AR_4246_Eruptive_M2.7_and_M2…>).
We are maintaining the Major
Flare Watch on 14246 for another 24 hours. Additional C-class and
low-M-class activity is expected, with a chance of a major flare (≥M5)
in the next 24 hours.
The position of NOAA 14246 on 16-October-2025 at 11:30 UT is:
N22W63, (796",318")
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 risen to a moderate-to-high level since the last
message. Target region NOAA 14246 (N22W50, beta-gamma-delta
/E-type) remains the most flare-productive area on the visible disk,
producing a dozen C-class and three low-to-mid M-class flares in the
period, including the largest event, an M4.8 at 03:49 UT today. At this
time we are implementing the Major Flare Watch on NOAA 14246.
Note that NOAA 14248 (N07W20, beta-gamma-delta/E-type) also
produced an M2.0 flare during the period. Additional low M-class
activity is expected, with a chance of a major flare above M5 in the
next 24 hours.
The position of NOAA 14246 on 15-October-2025 at 11:30 UT is:
N22W50, (685",300")
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 remains moderate. The largest event since the last
message was an M2.0 flare at 00:35 UT today from target region
NOAA 14246 (N22W37). This region has further developed into a
beta-gamma-delta configuration and has produced an additional
M1.3 flare and over 20 C-class flares during the period. NOAA
14246 will remain the target region for the next 24 hours. Please
note that NOAA 14248 (N07W06) has also increased its magnetic
complexity to a beta-gamma-delta configuration and produced two
low C-class flares in the period. Further C-class and low M-class
activity is expected.
The position of NOAA 14246 on 14-October-2025 at 11:30 UT is
N22W37, (538",285")
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 to a moderate level since the last message.
The largest event was an M2.8 flare at 08:55 UT today from target region
NOAA 14246 (N24W23). This region has evolved to a beta-gamma
configuration and, during the period, produced an additional M1.9 flare,
two flares of approximately M1.0, and eight C-class flares. The target
remains NOAA 14246 today given its ongoing significant flux emergence.
NOAA 14248 (N06E08, beta-gamma/D-type) also produced six C-class
flares, including a C9.5 today. Further C-class activity is expected, with
additional low M-class events possible in the next 24–48 hours.
The position of NOAA 14246 on 13-October-2025 at 11:30 UT is
N24W23, (344",305")
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 slightly. Several flares were produced in the
last 24 hours, the largest being a C9.6 from NOAA 14246 at 13:18 UT today.
This region is currently classified as a beta type region and has shown
significant flux increase in the last 24 hours, the target region will now
switch to NOAA 14246. Further C-class activity is expected with a slight
chance for an isolated low M-class flare in the next 24 hours.
The position of NOAA 14248 on 12-October-2025 at 15:30 UT is
N22W12, (186", 267")
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,
Harry Greatorex (Queen's University Belfast)