The geomagnetic field was quiet to unsettled on June 23. Solar wind speed at SOHO ranged between 376 and 491 km/sec. The high latitude magnetometer at Andenes recorded quiet to minor storm levels. A sudden minor increase in solar wind speed, density and temperature was recorded at 18:03 UT at DSCOVR. This may have been the arrival of the June 20 CME.
Solar flux density measured at 20h UT on 2.8 GHz was 169.7 - increasing 12.8 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 144.41. In comparison SC24 peaked on June 28, 2014 at 145.50). The Potsdam WDC planetary A index was 9 (STAR Ap - based on the mean of three hour interval ap indices: 8.6). Three hour interval K indices: 22122232 (planetary), 22232322 (Boulder), 42134455 (Andenes).
The background x-ray flux is at the class C1 level (GOES 16).
At the time of counting spots (see image time), spots were observed in 22 active regions using 2K resolution (SN: 469) and in 20 active regions using 1K resolution (SN: 312) SDO/HMI images.
Region 13334 [N18W50] decayed slowly and was
mostly quiet. C1 flares: C1.9 @ 18:44 UT
Region 13335 [S14W61] was mostly quiet and stable. C1 flares: C1.9 @
11:31, C1.6 @ 12:35 UT
Region 13337 [N19W35] lost mature penumbra and produced low level C
flares. C1 flares: C1.5 @ 10:33, C1.5 @ 23:27 UT
Region 13338 [N10W37] decayed slowly and was mostly quiet. C1 flares:
C1.7 @ 08:35, C1.8 @ 14:13 UT
Region 13339 [S20W10] was mostly quiet and stable.
Region 13340 [N22W07] decayed slightly but could still produce a
minor M class flare. C1 flares: C1.9 @ 05:06, C1.6 @ 06:22, C1.8 @ 07:00,
C1.5 @ 11:11, C1.6 @ 23:18 UT
Region 13341 [S16E22] was mostly quiet and stable. C1 flares: C1.9 @
08:04, C1.5 @ 09:23, C1.9 @ 17:00 UT
Region 13345 [N08E18] decayed slowly and quietly.
Region 13346 [N08W05] was quiet and stable.
New region 13347 [S19W24] emerged on June 21 and was numbered by SWPC
2 days later as the region began to decay.
New region 13348 [S31E48] emerged on June 21 with SWPC discovering
the region 2 days later.
New region 13349 [N08E38] emerged on June 22 and received its NOAA
number the following day.
New region 13350 [S12E39] emerged on June 20 and was numbered by SWPC
3 days later as the region decayed. C1 flares: C1.6 @ 21:45 UT
New region 13351 [N22E59] rotated into view on June 22 with a small,
mature spot.
Spotted regions not observed (or interpreted
differently) by SWPC/USAF:
S8682 [N17W06] was quiet and stable.
S8687 [N31E11] decayed slowly and quietly.
S8688 [S28W24] decayed slowly and quietly.
S8699 [N16E62] was quiet and stable.
New region S8700 [N08W43] emerged before noon with several spots.
New region S8701 [S11W06] emerged with a tiny spot.
New region S8702 [N38W12] emerged with a tiny spot.
New region S8703 [N19W44] emerged with tiny spots.
C2+ flares:
| Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
| C2.0 | 02:46 | 13340 | GOES16 | ||
| C2.1 | 02:55 | 13350 | GOES16 | ||
| C2.1 | 03:06 | 13335 | GOES16 | ||
| C4.6 | 03:32 | N20W26 | 13337 | GOES16 | |
| C2.9 | 10:04 | S15W50 | 13335 | GOES16 | |
| C2.0 | 16:46 | 13337 | GOES16 | simultaneous flare in AR 13335 | |
| C2.7 | 21:02 | N22W32 | 13337 | GOES16 |
June 22: A CME was observed after the M4 flare
in AR 13341 late in the day. Any Earth directed components would likely
reach us on June 26.
June 21, 23: No obviously Earth directed CMEs were
observed.
[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 trans equatorial coronal hole (CH1155) was Earth facing on June 23-24.
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 unsettled geomagnetic conditions are expected for June 24-26. Effects from CH1155 could reach Earth on June 27 and cause a few unsettled and active intervals. Components from the June 22-23 CME could reach Earth on June 26 and cause some active and minor storm intervals.
| 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 | ||||||||||
| 13333 | 2023.06.12 2023.06.13 |
S11W85 |
 |
location: S09W89 | |||||||
| 13334 | 2023.06.13 2023.06.13 |
2 | 1 | N17W54 | 0005 | BXO |
 |
 |
location: N18W50 SWPC added a duplicate region on June 19, AR 13343 |
||
| 13336 | 2023.06.13 2023.06.14 |
S19W58 |
location: S21W55 northern part merged with AR 13335 on June 21 |
||||||||
| 13335 | 2023.06.13 2023.06.14 |
9 | 16 | 7 | S15W58 | 0230 | DSO | DKO |
 |
 |
area: 0300 location: S14W61 |
| S8661 | 2023.06.14 | N22W49 | |||||||||
| 13337 | 2023.06.14 2023.06.15 |
6 | 21 | 12 | N20W38 | 0080 | DAO | DRI |
 |
 |
beta-gamma location: N19W35 area: 0120 |
| 13338 | 2023.06.14 2023.06.15 |
5 | 16 | 8 | N11W37 | 0020 | CRO | DRI |
 |
 |
area: 0040 location: N10W37 |
| S8670 | 2023.06.16 | N07W26 | |||||||||
| 13339 | 2023.06.16 2023.06.17 |
9 | 34 | 14 | S20W11 | 0110 | CAO | ESI |
 |
 |
beta-gamma area: 0130 location: S20W10 |
| 13340 | 2023.06.17 | 13 | 41 | 19 | N22W07 | 0160 | ESI | DAI |
 |
 |
beta-gamma area: 0230 |
| S8676 | 2023.06.18 | S13E04 | |||||||||
| 13341 | 2023.06.18 2023.06.19 |
5 | 27 | 10 | S16E22 | 0200 | CSO | CAO |
 |
 |
area: 0240 |
| S8678 | 2023.06.18 | S01W53 | |||||||||
| 13343 | 2023.06.19 | N16W56 | this is a duplicate of AR 13334 | ||||||||
| 13344 | 2023.06.19 2023.06.20 |
1 | N24W85 | 0010 | AXX |
 |
rotated out of view | ||||
| S8680 | 2023.06.19 | S16W13 | |||||||||
| S8682 | 2023.06.19 | 12 | 4 | N17W06 | 0020 | CRO |
 |
 |
|||
| 13345 | 2023.06.19 2023.06.20 |
3 | 13 | 5 | N08E19 | 0020 | CRO | CRO |
 |
 |
location: N08E18 area: 0030 |
| 13346 | 2023.06.20 2023.06.21 |
10 | 5 | N08W06 | 0020 | CRO |
 |
 |
location: N08W05 | ||
| 13350 | 2023.06.20 2023.06.23 |
1 | 4 | 2 | S11E39 | 0010 | AXX | AXX |
 |
 |
|
| S8687 | 2023.06.20 | 3 | N31E11 | 0005 | AXX |
 |
 |
||||
| S8688 | 2023.06.21 | 8 | 2 | S28W24 | 0010 | AXX |
 |
 |
|||
| S8689 | 2023.06.21 | N15E38 | |||||||||
| 13347 | 2023.06.21 2023.06.23 |
5 | 14 | 6 | S17W26 | 0030 | CRO | CRO |
 |
 |
location: S19W24 |
| S8691 | 2023.06.21 | S07W46 | |||||||||
| 13348 | 2023.06.21 2023.06.23 |
3 | 5 | 3 | S31E46 | 0020 | BXO | CRO |
 |
 |
location: S31E48 |
| 13349 | 2023.06.22 2023.06.23 |
3 | 8 | 5 | N09E38 | 0020 | BXO | DRO |
 |
 |
location: N08E38 area: 0040 |
| 13351 | 2023.06.22 2023.06.23 |
1 | 1 | 1 | N22E59 | 0020 | HSX | HAX |
 |
 |
area: 0040 |
| S8695 | 2023.06.22 | N16E19 |
 |
||||||||
| S8697 | 2023.06.22 | S14W13 |
 |
||||||||
| S8698 | 2023.06.22 | N37E14 |
 |
||||||||
| S8699 | 2023.06.22 | 2 | 1 | N16E62 | 0004 | AXX |
 |
 |
|||
| S8700 | 2023.06.23 | 8 | 5 | N08W43 | 0035 | DRO |
 |
||||
| S8701 | 2023.06.23 | 1 | 1 | S11W06 | 0004 | AXX |
 |
||||
| S8702 | 2023.06.23 | 1 | N38W12 | 0002 | AXX |
 |
|||||
| S8703 | 2023.06.23 | 2 | 1 | N19W44 | 0004 | BXO |
 |
||||
| Total spot count: | 64 | 249 | 112 | ||||||||
| Sunspot number: | 194 | 469 | 312 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 103 | 306 | 169 | (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): | 213 | 258 | 250 | ||||||||
| 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 |
| 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 | 77.4 (+4.4) | 7.48 |
| 2022.06 | 116.1 | 119.8 | 70.3 | 81.1 (+3.7) | 8.20 |
| 2022.07 | 125.4 | 129.5 | 91.4 | 86.7 (+5.6) | 9.51 |
| 2022.08 | 114.2 | 117.1 | 74.6 | 92.5 (+5.8) | 10.92 |
| 2022.09 | 135.1 | 136.5 | 96.0 | 96.4 (+3.9) | 12.18 |
| 2022.10 | 133.5 | 132.7 | 95.5 | 98.7 (+2.3) | 11.16 |
| 2022.11 | 123.4 | 120.7 | 80.5 | 101.0 (+2.3) | 9.33 |
| 2022.12 | 147.9 | 143.4 | 112.8 | (105.8 projected, +4.8) | 10.99 |
| 2023.01 | 182.4 | 176.6 | 143.6 | (112.2 projected, +6.4) | 8.73 |
| 2023.02 | 167.2 | 163.2 | 110.9 | (117.0 projected, +4.8) | 14.48 (current SC25 peak) |
| 2023.03 | 157.2 | 155.6 | 122.6 | (120.1 projected, +3.1) | 14.42 |
| 2023.04 | 145.4 | 146.4 | 96.4 | (125.5 projected, +5.4) | 13.40 |
| 2023.05 | 155.6 | 159.2 | 137.9 | (131.2 projected, +5.7) | 10.67 |
| 2023.06 | 163.1 (1) | 106.6 (2A) / 139.0 (2B) / 177.9 (2C) | (134.3 projected, +3.1) | (8.0) | |
| 2023.07 | (133.8 projected, -0.5) | ||||
| 2023.08 | (134.8 projected, +1.0) | ||||
| 2023.09 | (138.2 projected, +3.4) | ||||
| 2023.10 | (140.1 projected, +1.9) | ||||
| 2023.11 | (142.7 projected max SC25) | ||||
| 2023.12 | (142.6 projected, -0.1) | ||||
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
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.
