The geomagnetic field was quiet to unsettled on December 11 due to coronal high speed stream effects. Solar wind speed at SOHO ranged between 426 and 497 km/sec. The high latitude magnetometer at Andenes recorded quiet to minor storm levels.
Solar flux density measured at 20h UT on 2.8 GHz was 147.7 - increasing 6.2 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 122.40). The Potsdam WDC planetary A index was 9 (STAR Ap - based on the mean of three hour interval ap indices: 8.9). Three hour interval K indices: 23212313 (planetary), 23322322 (Boulder), 34423435 (Andenes).
The background x-ray flux is at the class B7 level (GOES 16).
At the time of counting spots (see image time), spots were observed in 13 active regions using 2K resolution (SN: 302) and in 11 active regions using 1K resolution (SN: 188) SDO/HMI images.
Region 13153 [S17W61] was mostly unchanged and
produced a few C flares. C1 flares: C1.2 @ 15:46, C1.7 @ 18:43 UT
Region 13156 [N25W50] decayed slowly and quietly.
Region 13157 [N16W38] decayed slowly and quietly.
Region 13160 [N22E11] was mostly quiet and stable. C1 flare: C1.1 @
10:44 UT
Region 13161 [N24W38] decayed slowly and was mostly quiet.
Region 13162 [S13E30] was quiet and stable.
Region 13163 [S19E50] developed slowly and was mostly quiet. C1
flares: C1.1 @ 02:30, C1.7 @ 06:38, C1.1 @ 07:37, C1.2 @ 14:39, C1.2 @
15:08, C1.5 @ 16:46 UT
New region 13164 [S20W32] was first observed with spots on December
5, then became spotless. The region was numbered by SWPC when new flux
emerged on December 11 and several spots formed.
New region 13165 [S20W09] emerged on December 10 and was numbered by
SWPC the next day as slow development continued.
New region 13166 [S09E47] emerged on December 10 with SWPC assigning
a number to the region the following day. The region developed slowly on
December 11 and has polarity intermixing.
Spotted regions not observed (or interpreted
differently) by SWPC:
S8076 [N29W51] developed slowly and quietly. The region produced a
C3.4 flare at 00:35 UT on December 12.
New region S8081 [N17E17] emerged with many tiny spots.
New region S8082 [S24E03] emerged with tiny spots.
C2+ flares:
| Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
| C2.9 | 11:40 | S16W60 | 13153 | GOES16 |
December 9-11: No obviously Earth directed CMEs were observed in available LASCO imagery.
[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]
No obvious coronal holes are currently in or near Earth facing positions.
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.
Quiet to unsettled geomagnetic conditions are likely on December 12. Quiet is expected for December 13-15.
| Coronal holes (1) | Coronal mass ejection (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 | ||||||||||
| 13153 | 2022.11.30 2022.12.01 |
5 | 13 | 7 | S17W59 | 0690 | FHO | FHO |
 |
 |
location: S17W61 area: 0850 |
| 13156 | 2022.12.01 2022.12.02 |
5 | 2 | 1 | N28W54 | 0080 | DSO | HSX |
 |
 |
location: N25W50 area: 0050 SWPC apparently includes the spots of AR S8057 in this region |
| S8056 | 2022.12.02 | N28W57 | |||||||||
| 13061 | 2022.12.02 2022.12.08 |
3 | N26W44 | 0003 | AXX |
 |
 |
location: N24W38 | |||
| 13157 | 2022.12.03 2022.12.03 |
17 | 46 | 22 | N16W37 | 0220 | ESI | ESI |
 |
 |
area: 0270 location: N16W38 |
| 13159 | 2022.12.05 2022.12.06 |
N29W03 |
 |
location: N29E01 | |||||||
| S8063 | 2022.12.05 | N17W54 |
 |
||||||||
| 13164 | 2022.12.05 2022.12.11 |
5 | 13 | 5 | S18W32 | 0020 | DRO | DRI |
 |
location: S20W32 area: 0070 |
|
| 13160 | 2022.12.06 2022.12.06 |
1 | 3 | 1 | N22E08 | 0080 | HSX | CSO |
 |
 |
location: N22E11 area: 0120 |
| S8067 | 2022.12.06 | S20W47 | |||||||||
| S8068 | 2022.12.06 | N35W45 | |||||||||
| 13162 | 2022.12.07 2022.12.09 |
1 | 3 | 1 | S13E29 | 0070 | HSX | HSX |
 |
 |
area: 0140 location: S13E30 |
| S8072 | 2022.12.07 | S31W57 | |||||||||
| S8073 | 2022.12.08 | N28W23 | |||||||||
| 13163 | 2022.12.09 2022.12.10 |
9 | 24 | 15 | S20E51 | 0140 | ESO | EKI |
 |
 |
location: S19E50 area: 0360 |
| S8075 | 2022.12.09 | S24E12 | |||||||||
| S8076 | 2022.12.09 | 21 | 9 | N29W51 | 0080 | DRI |
 |
 |
|||
| S8077 | 2022.12.09 | S13E02 | |||||||||
| 13165 | 2022.12.10 2022.12.11 |
4 | 19 | 7 | S18W10 | 0020 | CRO | DRI |
 |
 |
area: 0100 location: S20W09 |
| 13166 | 2022.12.10 2022.12.11 |
4 | 13 | 6 | S07E45 | 0020 | CRO | DRI |
 |
 |
area: 0050 location: S09E47 |
| S8080 | 2022.12.10 | S03E08 |
 |
||||||||
| S8081 | 2022.12.11 | 10 | 4 | N17E17 | 0030 | BXI |
 |
||||
| S8082 | 2022.12.11 | 2 | S24E03 | 0004 | BXO |
 |
|||||
| Total spot count: | 51 | 172 | 78 | ||||||||
| Sunspot number: | 141 | 302 | 188 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 95 | 224 | 130 | (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): | 155 | 166 | 150 | ||||||||
| 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 (solar max) | 7.88 |
| 2017.09 | 91.3 | 92.3 | 43.6 | 18.2 (-1.3) | 18.22 (cycle 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 |
| 2021.05 | 75.3 | 77.1 | 21.2 | 25.8 (+1.0) | 6.50 |
| 2021.06 | 79.4 | 81.8 | 25.0 | 27.6 (+1.8) | 5.52 |
| 2021.07 | 81.0 | 83.6 | 34.3 | 31.4 (+3.8) | 5.51 |
| 2021.08 | 77.7 | 79.7 | 22.0 | 35.4 (+4.0) | 6.19 |
| 2021.09 | 87.0 | 88.2 | 51.3 | 40.2 (+4.8) | 6.33 |
| 2021.10 | 88.9 | 88.3 | 37.4 | 45.2 (+5.0) | 7.38 |
| 2021.11 | 86.2 | 84.4 | 34.8 | 50.8 (+5.6) | 9.83 |
| 2021.12 | 103.0 | 99.8 | 67.5 | 55.9 (+5.1) | 6.40 |
| 2022.01 | 103.8 | 100.5 | 55.3 | 60.1 (+4.2) | 8.92 |
| 2022.02 | 109.1 | 106.5 | 60.9 | 64.8 (+4.7) | 10.46 |
| 2022.03 | 117.0 | 115.8 | 78.6 | 68.9 (+4.1) | 10.20 |
| 2022.04 | 130.8 | 131.7 | 84.0 | 73.1 (+4.2) | 11.79 |
| 2022.05 | 133.8 | 136.8 | 96.5 | 77.3 (+4.2) | 7.48 |
| 2022.06 | 116.1 | 119.8 | 70.3 | (80.7 projected, +3.6) | 8.20 |
| 2022.07 | 125.4 | 129.5 | 91.4 | (85.7 projected, +5.0) | 9.51 |
| 2022.08 | 114.2 | 117.1 | 75.4 | (91.4 projected, +5.7) | 10.92 |
| 2022.09 | 135.1 | 136.5 | 96.3 | (96.3 projected, +4.9) | 12.18 |
| 2022.10 | 133.5 | 132.7 | 95.4 | (99.5 projected, +3.2) | 11.16 |
| 2022.11 | 123.4 | 120.7 | 77.6 | (102.3 projected, +2.8) | 9.33 |
| 2022.12 | 140.3 (1) | 34.8 (2A) / 98.0 (2B) / 99.3 (2C) | (107.1 projected, +4.8) | (11.3) | |
| 2023.01 | (113.1 projected, +6.0) | ||||
| 2023.02 | (118.1 projected, +5.0) | ||||
| 2023.03 | (121.2 projected, +3.1) | ||||
| 2023.04 | (126.6 projected, +5.4) | ||||
| 2023.05 | (132.4 projected, +5.8) | ||||
| 2023.11 | (142.5 projected max SC25) | ||||
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: SIDC-SILSO.
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.
