The geomagnetic field was unsettled to active on February 9 due to effects from CH1129 before noon, and then likely from a transient which became dominant after 16h UT. Solar wind speed at SOHO ranged between 417 and 602 km/sec. The high latitude magnetometer at Andenes recorded quiet to major storm levels.
Solar flux density measured at 20h UT on 2.8 GHz was 214.6 - increasing 6.1 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 131.63). The Potsdam WDC planetary A index was 19 (STAR Ap - based on the mean of three hour interval ap indices: 19.0). Three hour interval K indices: 34333334 (planetary), 24234333 (Boulder), 45422356 (Andenes).
The background x-ray flux was at the class C3 level (GOES 16).
At the time of counting spots (see image time), spots were observed in 17 active regions using 2K resolution (SN: 375) and in 15 active regions using 1K resolution (SN: 263) SDO/HMI images.
Region 13207 [S14W57] decayed slowly and
quietly.
Region 13209 [N20W22] was quiet and stable.
Region 13213 [N30W23] still has several magnetic deltas in the trailing spot section
and produced multiple C and M flares. A major flare is
possible.
Region 13214 [N11W07] was mostly quiet and stable.
Region 13215 [N22E17] was quiet and stable.
Region 13216 [N25E31] was mostly quiet and stable.
Region 13218 [N12E47] was quiet and stable.
New region 13220 [S14E77] rotated into view with mature spots.
New region 13221 [N15E74] rotated into view with mature spots.
Spotted regions not observed (or interpreted
differently) by SWPC:
S8238 [S21W20] was quiet and stable.
S8250 [S25E05] was quiet and stable.
S8254 [N22W15] was quiet and stable.
S8256 [S11E62] is a compact region with major
flare potential. The region produced several C and M flares.
S8257 [S06E56] developed slowly and quietly.
S8258 [N08W50] was quiet and stable.
S8260 [S13E16] was quiet and stable.
New region S8264 [S10E71] rotated into view with small spots.
C2+ flares:
| Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
| C3.6 | 00:46 | 13213 | GOES16 | ||
| C3.7 | 01:09 | 13221 | GOES16 | ||
| C4.4 | 01:24 | 13213 | GOES16 | ||
| M3.0 | 03:10 | S8256/S8257 | GOES16 | ||
| M2.2 | 03:22 | 13213 | GOES16 | ||
| C5.9 | 05:20 | 13213 | GOES16 | simultaneous flare in AR 13211 | |
| C5.9 | 05:46 | N31W13 | 13213 | GOES16 | |
| C7.9 | 06:19 | 13220 | GOES16 | ||
| C7.9 | 06:31 | 13213 | GOES16 | ||
| M1.1 | 07:17 | S8256 | GOES16 | weak type II radio sweep | |
| C3.9 | 08:15 | 13220 | GOES16 | ||
| M2.8 | 09:07 | S8256 | GOES16 | weak type II and IV radio sweeps | |
| C8.4 | 12:20 | 13213 | GOES16 | ||
| M1.5 | 14:56 | N30W18 | 13213 | GOES16 | |
| M1.4/1F | 15:25 | S09E69 | S8256 | GOES16 | |
| M1.2 | 15:37 | southwest limb | 13211 | GOES16 | |
| C6.4 | 17:14 | N29W21 | 13213 | GOES16 | |
| C6.1/1N | 17:52 | N29W21 | 13213 | GOES16 | |
| C6.5 | 18:12 | S13E72 | S8256 | GOES16 | |
| M1.8 | 18:42 | 13213 | GOES16 | ||
| C3.9 | 20:45 | 13213 | GOES16 | ||
| C4.8 | 21:09 | 13213 | GOES16 | ||
| C3.0 | 21:49 | 13213 | GOES16 | ||
| C3.4 | 22:19 | S8256 | GOES16 | ||
| C4.9 | 22:44 | 13213 | GOES16 | ||
| C4.7 | 22:50 | 13214 | GOES16 |
February 7-9: 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 poor. Propagation on long distance northeast-southwest paths is poor to fair.
Quiet to active geomagnetic conditions are likely on February 10-12.
| 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 | ||||||||||
| 13207 | 2023.01.29 2023.01.30 |
2 | S13W61 | 0002 | BXO |
 |
 |
|
|||
| 13208 | 2023.02.01 2023.02.01 |
N15W57 |
location: N15W50 |
||||||||
| 13209 | 2023.02.01 2023.02.03 |
5 | 3 | N20W29 | 0012 | BXO |
 |
 |
location: N20W22 | ||
| S8234 | 2023.02.01 | S29W39 | |||||||||
| 13210 | 2023.02.02 2023.02.03 |
S14W84 |
 |
location: S15W83 | |||||||
| S8238 | 2023.02.03 | 14 | 3 | S21W20 | 0020 | BXO |
 |
 |
|||
| 13213 | 2023.02.04 2023.02.06 |
18 | 56 | 39 | N30W28 | 0290 | EKC | EKC |
 |
 |
beta-gamma-delta area: 0610 location: N30W23 |
| S8243 | 2023.02.05 | N28W41 | |||||||||
| 13214 | 2023.02.05 2023.02.06 |
13 | 29 | 17 | N11W07 | 0280 | DHO | DSI |
 |
 |
area: 0480 |
| 13215 | 2023.02.05 2023.02.06 |
3 | 10 | 4 | N22E16 | 0020 | CRO | CRO |
 |
 |
location: N22E17 |
| 13216 | 2023.02.05 2023.02.06 |
5 | 14 | 8 | N25E31 | 0150 | DAO | CAO |
 |
 |
area: 0200 |
| S8247 | 2023.02.05 | S27W17 | |||||||||
| S8248 | 2023.02.05 | S23W38 | |||||||||
| S8249 | 2023.02.05 | S34W52 | |||||||||
| S8250 | 2023.02.06 | 9 | 3 | S25E05 | 0015 | BXO |
 |
 |
|||
| S8251 | 2023.02.06 | N09W33 | |||||||||
| S8254 | 2023.02.07 | 2 | N22W15 | 0003 | AXX |
 |
 |
||||
| 13218 | 2023.02.07 2023.02.08 |
3 | 7 | 2 | N12E49 | 0020 | CRO | CRO |
 |
 |
location: N12E47 |
| S8256 | 2023.02.07 | 20 | 13 | S11E62 | 0610 | EKC |
 |
 |
beta-gamma see AR 13217 |
||
| 13217 | 2023.02.08 | 9 | S10E63 | 0260 | DKC | ||||||
| S8257 | 2023.02.08 | 14 | 9 | S06E56 | 0040 | DRI |
 |
 |
see AR 13219 | ||
| S8258 | 2023.02.08 | 5 | 2 | N08W50 | 0010 | BXO |
 |
 |
|||
| S8259 | 2023.02.08 | N18E60 |
 |
||||||||
| S8260 | 2023.02.08 | 7 | 3 | S13E16 | 0015 | BXO |
 |
 |
|||
| S8261 | 2023.02.08 | S09E04 |
 |
||||||||
| 13219 | 2023.02.09 | 5 | S17E54 | 0010 | BXO |
see AR S8257 SWPC location likely a typo |
|||||
| 13220 | 2023.02.09 2023.02.09 |
2 | 3 | 2 | S15E77 | 0080 | DSO | HHX |
 |
area: 0330 location: S14E77 was AR S8263 |
|
| 13221 | 2023.02.09 2023.02.09 |
2 | 2 | 2 | N14E75 | 0080 | HAX | HAX |
|
area: 0180 location: N15E74 was AR S8262 |
|
| S8264 | 2023.02.09 | 6 | 3 | S10E71 | 0020 | CRO |
 |
||||
| Total spot count: | 60 | 205 | 113 | ||||||||
| Sunspot number: | 150 | 375 | 263 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 111 | 262 | 170 | (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): | 165 | 206 | 210 | ||||||||
| 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 |
| 2021.07 | 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 | 64.7 (+4.6) | 10.46 |
| 2022.03 | 117.0 | 115.8 | 78.6 | 68.7 (+4.0) | 10.20 |
| 2022.04 | 130.8 | 131.7 | 84.0 | 73.0 (+4.3) | 11.79 |
| 2022.05 | 133.8 | 136.8 | 96.5 | 77.2 (+4.2) | 7.48 |
| 2022.06 | 116.1 | 119.8 | 70.3 | 80.9 (+3.7) | 8.20 |
| 2022.07 | 125.4 | 129.5 | 91.4 | 86.5 (+5.6) | 9.51 |
| 2022.08 | 114.2 | 117.1 | 74.6 | (92.4 projected, +5.9) | 10.92 |
| 2022.09 | 135.1 | 136.5 | 96.0 | (97.4 projected, +5.0) | 12.18 |
| 2022.10 | 133.5 | 132.7 | 95.4 | (100.5 projected, +3.1) | 11.16 |
| 2022.11 | 123.4 | 120.7 | 77.6 | (103.4 projected, +2.9) | 9.33 |
| 2022.12 | 147.9 | 143.4 | 113.1 | (108.2 projected, +4.8) | 10.99 |
| 2023.01 | 182.4 | 176.6 | 143.6 | (114.2 projected, +6.0) | 8.7 |
| 2023.02 | 160.0 (1) | 32.3 (2A) / 100.6 (2B) / 167.4 (2C) | (119.2 projected, +5.0) | (11.2) | |
| 2023.03 | (122.3 projected, +3.1) | ||||
| 2023.04 | (127.7 projected, +5.4) | ||||
| 2023.05 | (133.5 projected, +5.8) | ||||
| 2023.06 | (136.8 projected, +3.3) | ||||
| 2023.07 | (136.3 projected, -0.5) | ||||
| 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.
