The geomagnetic field was at quiet levels on November 27. Solar wind speed at SOHO ranged between 344 and 415 km/sec, averaging 372 km/sec (-21 compared to the previous day). The high latitude magnetometer at Andenes recorded quiet to active levels. The above 10 MeV proton flux was at background levels all day.
Solar flux density measured at 20h UT on 2.8 GHz was 225.0 - decreasing 44.9 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 186.44. In comparison SC24 peaked on June 28, 2014 at 145.50 while SC23 peaked on February 23, 2002 at 198.15. Current SC25 peak: 186.44 on May 29, 2024). The Potsdam WDC planetary A index was 4 (STAR Ap - based on the mean of three hour interval ap indices: 3.8). Three hour interval K indices: 11010112 (planetary), 10102222 (Boulder), 20000024 (Andenes).
The background x-ray flux is at the class C1 level (GOES 16).
At the time of counting spots, spots were observed in 20 active regions using 2K resolution (SN: 426) and in 14 active regions using 1K resolution (SN: 242) images.
AR 13900 [N25W43] decayed slowly and quietly.
AR 13901 [S07W59] decayed slowly and was mostly quiet.
AR 13902 [S15W16] was quiet and stable.
AR 13905 [S09W03] decayed slowly in the leading spot section.
AR 13906 [S15E11] decayed slowly. A major flare is possible.
AR 13907 [S21W36] developed significantly and was mostly quiet.
AR 13908 [N14E23] decayed slowly and quietly.
AR 13910 [N17E58] was mostly unchanged and produced a few flares.
AR 13911 [S15W51] matured and produced a few C flares.
Spotted regions not observed (or interpreted
differently) by SWPC/USAF:
S10402 [N30W20] reemerged with tiny spots.
S10403 [S12W64] decayed slowly and quietly.
S10409 [N06W53] decayed slowly and quietly.
S10410 [N09W25] was quiet and stable.
New region S10411 [S17W29] emerged with several
small and tiny spots.
New region S10412 [S06E78] rotated into view with a small spot.
New region S10413 [S15E18] was observed with tiny spots in an
old plage area.
New region S10414 [N17E68] emerged with a tiny spot.
New region S10415 [S14E59] emerged with tiny
spots.
New region S10416 [S07E33] emerged with tiny spots.
New region S10417 [S18W78] emerged with a tiny
spot.
C2+ flares
| Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
| C2.6 | 00:51 | GOES16 | |||
| C3.5 | 02:28 | 13901 | GOES16 | ||
| C3.2 | 03:01 | 13906 | GOES16 | ||
| C2.1 | 04:02 | GOES16 | |||
| C2.1 | 05:40 | GOES16 | |||
| C2.7 | 06:57 | GOES16 | |||
| C2.8 | 07:24 | GOES16 | |||
| C3.1 | 08:27 | 13910 | GOES16 | ||
| C3.2 | 08:36 | 13910 | GOES16 | ||
| C3.0 | 08:56 | 13911 | GOES16 | ||
| C2.9 | 09:56 | GOES16 | |||
| C9.5 | 10:20 | S17W41 | 13911 | GOES16 | |
| C3.3 | 11:24 | GOES16 | |||
| C7.8 | 11:45 | 13905 | GOES16 | ||
| C7.6 | 12:05 | 13911 | GOES16 | ||
| M1.0 | 12:46 | 13901 | GOES16 | ||
| C2.9 | 14:12 | GOES16 | |||
| C2.2 | 15:23 | GOES16 | |||
| C3.0 | 16:02 | GOES16 | |||
| C2.4 | 16:35 | GOES16 | |||
| C2.2 | 17:15 | GOES16 | |||
| C2.6 | 17:21 | GOES16 | |||
| C6.0 | 18:11 | GOES16 | |||
| C5.4 | 19:12 | GOES16 | |||
| C3.3 | 19:42 | GOES16 | |||
| C2.8 | 20:29 | GOES16 | |||
| C3.4 | 22:00 | GOES16 | |||
| C3.0 | 22:11 | GOES16 | |||
| C2.0 | 23:01 | GOES16 |
November 26-27: No obviously Earth directed CMEs were observed.
November 25: A large filament eruption in the
southern hemisphere was observed after 02h UT. A partial halo CME was
associated with this event, and there is a slight chance components of this
CME could reach Earth on November 28. Another filament eruption occurred in
the southwest quadrant after an M1 flare in AR 13901 late in the day. There
was considerable coronal dimming. The CME will likely reach Earth late on
November 28 and cause unsettled to major geomagnetic storm levels.
[Coronal
hole history (since October 2002)]
[Compare today's report to the situation one solar rotation ago:
28 days ago
27 days ago
26 days ago]
A recurrent positive polarity northern hemisphere coronal hole (CH1258) rotatet across the central meridian on November 27.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over upper middle and high latitudes is fair. Propagation on long distance northeast-southwest paths is poor.
The geomagnetic field is expected to be quiet most of November 28 and unsettled to major storm on November 29 due to CME effects. Quiet to unsettled is expected for November 30.
| Coronal holes (1) | Coronal mass ejections (2) | M and X class flares (3) |
1) Effects from a coronal hole could
reach Earth within the next 5 days. When the high speed stream has arrived
the color changes to green.
2) Effects from a CME are likely to be observed at Earth within 96
hours.
3) There is a possibility of either M or X class flares within the
next 48 hours.
Green: 0-30% probability, Yellow: 30-70% probability, Red: 70-100% probability.
(Click on image for 2K resolution).
4K resolution.
Compare to the previous
day's image. 0.5K image
When available the active region map has a coronal hole polarity overlay where red (pink) is negative and blue is positive.
Data for all officially numbered solar regions according to the Solar Region Summary provided by NOAA/SWPC, all other regions are numbered sequentially as they emerge using the STAR spot number. Comments are my own, as is the STAR spot count (spots observed at or inside a few hours before midnight) and data for regions not numbered by SWPC or where SWPC has observed no spots. SWPC active region numbers in the table below and in the active region map above are the historic SWPC/USAF numbers. SWPC data considered to be not sufficiently precise (location, area, classification) are colored red.
| Active region | SWPC date numbered STAR detected |
Spot count | Location at midnight | Area | Classification | SDO / HMI 4K continuum image with magnetic polarity overlays |
Comment | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SWPC/ USAF |
Magnetic (SDO) |
SWPC | STAR | Current | Previous | ||||||
| 2K | 1K | ||||||||||
| 13900 | 2024.11.16 2024.11.18 |
4 | 1 | N22W64 | BXO |
 |
location: N25W43 SWPC split off the trailing spot section into AR 13909 on 2024.11.24 |
||||
| 13901 | 2024.11.17 2024.11.18 |
1 | 5 | 3 | S09W58 | 0040 | HAX | CAO |
 |
location: S07W59 area: 0150 |
|
| 13899 | 2024.11.17 2024.11.17 |
S10W83 |
location: S11W79 |
||||||||
| S10379 | 2024.11.18 | S17W53 | |||||||||
| 13911 | 2024.11.19 2024.11.26 |
8 | 7 | 3 | S14W47 | 0030 | CRO | CSO |
 |
location: S15W51 | |
| 13902 | 2024.11.20 2024.11.20 |
1 | 5 | 2 | S16W16 | 0040 | HSX | CSO |
 |
location: S15W16 area: 0110 |
|
| S10390 | 2024.11.20 | N27W23 | |||||||||
| 13905 | 2024.11.21 2024.11.21 |
15 | 41 | 24 | S09W03 | 0320 | EKO | EKO |
 |
area: 0650 | |
| 13906 | 2024.11.22 2024.11.22 |
26 | 62 | 30 | S16E07 | 0400 | EKI | EKC |
 |
location: S16E11 area: 0700 |
|
| S10396 | 2024.11.22 | N02W48 | |||||||||
| S10397 | 2024.11.22 | N17E05 |
 |
||||||||
| 13907 | 2024.11.23 2024.11.23 |
6 | 18 | 10 | S22W35 | 0040 | DAO | DRI |
 |
location: S21W36 | |
| 13908 | 2024.11.23 2024.11.23 |
3 | 20 | 6 | N13E26 | 0010 | BXO | CRO |
 |
location: N14E23 area: 0040 |
|
| S10399 | 2024.11.23 | N13W36 | |||||||||
| S10401 | 2024.11.23 | N01W37 | |||||||||
| 13909 | 2024.11.24 | N25W46 | see AR 13900 | ||||||||
| S10402 | 2024.11.24 | 6 | N30W20 | 0010 | AXX | ||||||
| S10403 | 2024.11.24 | 3 | S12W64 | 0005 | BXO | ||||||
| 13910 | 2024.11.25 2024.11.26 |
1 | 20 | 12 | N17E55 | 0250 | DKO | DKI |
 |
location: N17E58 area: 0500 |
|
| S10405 | 2024.11.25 | N21E56 |
 |
merged with AR 13910 | |||||||
| S10406 | 2024.11.25 | S13E21 | |||||||||
| S10407 | 2024.11.25 | S20W07 | |||||||||
| S10409 | 2024.11.26 | 3 | 3 | N06W53 | 0010 | BXO |
 |
||||
| S10410 | 2024.11.26 | 3 | N12W29 | 0005 | BXO |
 |
|||||
| S10411 | 2024.11.27 | 13 | 4 | S17W29 | 0030 | BXO | |||||
| S10412 | 2024.11.27 | 2 | 2 | S06E78 | 0170 | HSX | |||||
| S10413 | 2024.11.27 | 7 | S15E18 | 0015 | AXX | ||||||
| S10414 | 2024.11.27 | 1 | N17E68 | 0001 | AXX | ||||||
| S10415 | 2024.11.27 | 2 | 1 | S14E59 | 0004 | AXX | |||||
| S10416 | 2024.11.27 | 3 | S07E33 | 0005 | BXO | ||||||
| S10417 | 2024.11.27 | 1 | 1 | S18W78 | 0003 | AXX | |||||
| Total spot count: | 61 | 226 | 102 | ||||||||
| Sunspot number: | 141 | 426 | 242 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 109 | 282 | 158 | (Sum of total spot count + classification weighting for each AR. Classification weighting: X=0, R=3, A/S=5, H/K=10) | |||||||
| Relative sunspot number (Wolf number): | 154 | 234 | 193 | ||||||||
| Month | Average solar flux | International sunspot number (WDC-SILSO) |
Smoothed sunspot number (4) | Average
ap (3) |
|
|---|---|---|---|---|---|
| Measured | 1 AU | ||||
| 2014.02 | 170.3 (cycle peak) |
166.3 | 146.1 (SC24 peak) | 110.5 | 10.70 |
| 2014.04 | 143.9 | 144.8 | 112.5 | 116.4 (SC24 solar max) | 7.88 |
| 2017.09 | 91.3 | 92.3 | 43.6 | 18.2 (-1.3) | 18.22 (SC24 peak) |
| 2019.11 | 70.2 | 68.7 | 0.5 | 2.0 (-0.6) (Solar minimum using 365d smoothing: November 17, 2019) |
4.19 |
| 2019.12 | 70.8 | 68.6 | 1.6 | 1.8 (-0.2) (ISN 13 months smoothed solar minimum) |
3.22 |
| 2023.03 | 157.2 | 155.6 | 123.3 | 121.1 (+3.3) | 14.42 |
| 2023.04 | 145.4 | 146.4 | 97.6 | 122.9 (+1.8) | 13.40 |
| 2023.05 | 155.6 | 159.2 | 137.4 | 124.2 (+1.3) | 10.67 |
| 2023.06 | 161.7 | 166.8 | 160.5 | 125.3 (+1.1) | 8.95 |
| 2023.07 | 176.4 | 182.2 | 160.0 | 124.6 (-0.7) | 8.15 |
| 2023.08 | 153.7 | 157.6 | 114.8 | 124.3 (-0.3) | 7.19 |
| 2023.09 | 154.4 | 156.0 | 134.2 | 124.0 (-0.3) | 14.26 |
| 2023.10 | 142.8 | 141.9 | 99.4 | 124.8 (+0.8) | 8.16 |
| 2023.11 | 153.5 | 150.2 | 105.4 | 127.9 (+3.1) | 12.20 |
| 2023.12 | 151.1 | 146.4 | 114.2 | 129.5 (+1.6) | 9.60 |
| 2024.01 | 164.6 | 159.3 | 126.0 | 131.1 (+1.6) | 5.46 |
| 2024.02 | 172.5 | 168.3 | 123.0 | 136.9 (+5.8) | 5.31 |
| 2024.03 | 154.4 | 152.9 | 103.7 | 141.4 (+4.5) | 11.03 |
| 2024.04 | 161.3 | 162.6 | 137.0 | 144.4 (+3.1) | 9.69 |
| 2024.05 | 187.7 | 191.9 | 172.1 | (149.7 projected, +5.3) | 23.56 (SC25 peak) |
| 2024.06 | 184.3 | 190.2 | 164.1 | (153.6 projected, +3.9) | 10.24 |
| 2024.07 | 196.6 | 203.0 | 196.5 | (156.5 projected, +2.9) | 7.13 |
| 2024.08 | 246.1 (cycle peak) |
252.2 | 215.5 (SC25 peak) | (158.5 projected, +2.0) | 15.96 |
| 2024.09 | 195.7 | 197.8 | 141.4 | (161.2 projected, +2.7) | 15.36 |
| 2024.10 | 221.0 | 219.6 | 166.3 | (163.5 projected, +2.3) | 18.99 |
| 2024.11 | 196.7 (1) | 130.5 (2A) / 144.9 (2B) / 187.9 (2C) ISN current month average: 154 |
(161.8 projected, -1.7) | (9.7) | |
| 2024.12 | (158.7 projected, -3.1) | ||||
| 2025.01 | (154.4 projected, -4.3) | ||||
| 2025.02 | (147.6 projected, -6.8) | ||||
| 2025.03 | (142.8 projected, -4.8) | ||||
| 2025.04 | (139.8 projected, -3.0) | ||||
1) Running average based on the daily 20:00 UTC observed solar flux value
at 2800 MHz and any corrections applied to that measurement.
2A) Current impact on the monthly sunspot number based on the Boulder
(NOAA/SWPC) sunspot number (accumulated daily sunspots / month days).
2B) Boulder SN current month average to date.
2C) STAR SDO 1K Wolf number 30 day average.
3) Running average based on the quicklook and definitive Potsdam WDC ap
indices. Values in red
are based on the definitive international
GFZ Potsdam WDC ap
indices.
4) Source: WDC-SILSO, Royal Observatory
Of Belgium, Brussels
Sunspot activity in October 2024 increased over September and looks to be headed for an SSN near 160. The average solar flux for October will become the second highest for a month during SC25. The above plot now displays the peak in 365d smoothed sunspot numbers in mid October 2024. ISN has a peak on October 15, NOAA SN on October 14 while both the 1K and 2K SDO SN peaked on October 16. Assuming that the average sunspot number from October 2024 until April 14, 2025 becomes 150, we would be looking at a 365 days smoothed sunspot maximum of 164.5 centered on October 15. Should the average sunspot number for that period become 160 we would get a peak near 169.7.
--------------------------------------------------------------------------------------
This report has been prepared by Jan Alvestad. It is based on the analysis of data from whatever sources are available at the time the report is prepared. All time references are to Universal Time. Comments and suggestions are always welcome.
SDO images are courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
