The geomagnetic field was quiet to active on October 28, under the influence of a high speed stream from CH1109 after 15h UT. Solar wind speed at SOHO ranged between 379 and 603 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 129.3 - decreasing 18.6 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 117.48). The Potsdam WDC planetary A index was 15 (STAR Ap - based on the mean of three hour interval ap indices: 14.8). Three hour interval K indices: 22322434 (planetary), 23323533 (Boulder), 42323656 (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 10 active regions using 2K resolution (SN: 194) and in 7 active regions using 1K resolution (SN: 116) SDO/HMI images.
Region 13130 [S23W57] was mostly quiet and
stable. C1 flares: C1.0 @ 08:38 UT
Region 13131 [N22E17] was quiet and stable.
Region 13132 [S11W63] decayed slowly and quietly.
Region 13133 [N27E34] gained spots and was mostly quiet.
New region 13134 [N12E13] was first observed with spots on October 24
with SWPC numbering the region 4 days later.
New region 13135 [N27E65] rotated into view on October 27 and got its
NOAA number the following day as the region developed slowly. C1 flares:
C1.0 @ 16:53, C1.3 @ 20:29, C1.6 @ 22:22 UT
Spotted regions not observed (or interpreted
differently) by SWPC:
S7957 [S18W64] decayed slowly and quietly.
S7959 [N16E57] was quiet and stable.
New region S7960 [S14E35] was observed with tiny spots in an old
plage area.
New region S7961 [N12E02] emerged with tiny
spots.
AR 13126 behind the southwest limb was the source of a C1.1 flare at 00:16 UT.
C2+ flares:
| Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
October 26-28: 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]
A recurrent northern hemisphere coronal hole (CH1108) was in an Earth facing position on October 24-25. A recurrent trans equatorial coronal hole (CH1109) will rotate across the central meridian on October 26-28. Another recurrent trans equatorial coronal hole will likely become Earth facing on November 1.
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.
Quiet to minor storm conditions are likely on October 29 - November 2, first due to effects from CH1108, then on October 29-31 due to effects from CH1109 and on November 1-2 from CH1110. Quiet to unsettled conditions are likely on November 3 becoming quiet to active on November 4-5 due to effects from CH1111.
| 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 | ||||||||||
| 13127 | 2022.10.17 2022.10.20 |
S22W89 | |||||||||
| 13130 | 2022.10.20 2022.10.23 |
10 | 24 | 11 | S25W58 | 0080 | DAI | DAI |
 |
 |
area: 0180 location: S23W57 |
| S7946 | 2022.10.21 | S27W22 | |||||||||
| S7948 | 2022.10.22 | N14W54 | |||||||||
| S7950 | 2022.10.23 | N18W31 |
 |
||||||||
| 13131 | 2022.10.23 2022.10.24 |
3 | 14 | 4 | N22E16 | 0150 | CSO | DSO |
 |
 |
area: 0240 location: N22E17 |
| S7952 | 2022.10.23 | S14W31 | |||||||||
| 13132 | 2022.10.24 2022.10.25 |
1 | 1 | 1 | S11W63 | 0010 | AXX | HRX |
 |
 |
|
| 13134 | 2022.10.24 2022.10.28 |
2 | 10 | 5 | N12E14 | 0010 | BXO | BXO |
 |
 |
area: 0020 |
| 13133 | 2022.10.24 2022.10.25 |
8 | 30 | 19 | N26E33 | 0140 | DAO | DRI |
 |
 |
area: 0090 location: N27E34 |
| S7957 | 2022.10.27 | 1 | S18W04 | 0001 | AXX |
 |
 |
||||
| 13135 | 2022.10.27 2022.10.28 |
3 | 4 | 4 | N27E65 | 0020 | BXO | DAO |
 |
 |
area: 0080 |
| S7959 | 2022.10.27 | 1 | N27E34 | 0001 | AXX |
 |
 |
||||
| S7960 | 2022.10.28 | 4 | S14E35 | 0006 | BXO |
 |
|||||
| S7961 | 2022.10.28 | 5 | 2 | N12E02 | 0010 | BXO |
 |
||||
| Total spot count: | 27 | 94 | 46 | ||||||||
| Sunspot number: | 87 | 194 | 116 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 42 | 115 | 67 | (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): | 96 | 107 | 93 | ||||||||
| 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 |
| 2021.03 | 76.0 | 75.2 | 17.2 | 21.7 (+2.7) | 10.17 |
| 2021.04 | 75.9 | 76.4 | 24.5 | 24.8 (+3.1) | 8.40 |
| 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 | (74.2 projected, +5.3) | 11.79 |
| 2022.05 | 133.8 | 136.8 | 96.5 | (80.6 projected, +6.4) | 7.48 |
| 2022.06 | 116.1 | 119.8 | 70.3 | (86.5 projected, +5.9) | 8.20 |
| 2022.07 | 125.4 | 129.5 | 91.4 | (93.7 projected, +7.2) | 9.51 |
| 2022.08 | 114.2 | 117.1 | 75.4 | (100.2 projected, +6.5) | 10.92 |
| 2022.09 | 135.1 | 136.5 | 96.3 | (105.2 projected, +5.0) | 12.18 |
| 2022.10 | 133.8 (1) | 78.1 (2A) / 86.5 (2B) / 105.1 (2C) | (108.3 projected, +3.1) | (11.0) | |
| 2022.11 | (111.2 projected, +2.9) | ||||
| 2022.12 | (115.9 projected, +4.7) | ||||
| 2023.01 | (122.0 projected, +6.1) | ||||
| 2023.02 | (127.0 projected, +5.0) | ||||
| 2023.03 | (130.0 projected, +3.0) | ||||
| 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.
