The geomagnetic field was very quiet on July 9. Solar wind speed at SOHO ranged between 352 and 386 km/sec. The high latitude magnetometer at Andenes recorded quiet levels.
Solar flux density measured at 20h UT on 2.8 GHz was 179.2 - increasing 33.1 over the previous solar rotation. (Centered 1 year average SF at 1 AU - 183 days ago: 146.85. In comparison SC24 peaked on June 28, 2014 at 145.50). The Potsdam WDC planetary A index was 3 (STAR Ap - based on the mean of three hour interval ap indices: 2.9). Three hour interval K indices: 00011111 (planetary), 00113222 (Boulder), 00022212 (Andenes).
The background x-ray flux is at the class C2 level (GOES 16).
At the time of counting spots (see image time), spots were observed in 17 active regions using 2K resolution (SN: 382) and in 14 active regions using 1K resolution (SN: 245) SDO/HMI images.
Region 13358 [S12W51] decayed slowly and quietly.
Region 13359 [S21W52] decayed further and produced a few flares. C1
flares: C1.8 @ 15:45 UT
Region 13360 [N22W44] developed slowly and quietly.
Region 13361 [N23W23] decayed losing spots and area. There is still a magnetic delta
and C and M flares are likely. C1 flares: C1.7 @ 05:47 UT
Region 13362 [S09E09] was quiet and stable.
Region 13363 [S22E32] decayed slightly and was mostly quiet. M flares are
possible. C1 flares: C1.8 @ 03:28 UT
Region 13364 [N23E17] was quiet and stable.
Region 13365 [S35W49] decayed slowly and quietly.
Region 13366 [S11W40] decayed and produced a few C flares. C1 flares:
C1.9 @ 02:47 UT
Region 13367 [N09E01] developed slowly and was mostly quiet.
New region 13368 [S19W33] was observed with tiny spots as early as
July 2. On July 9 new flux emerged and many spots formed. C flares are
likely.
New region 13369 [S19W22] emerged on July 8 and was numbered the next
day by SWPC.
Spotted regions not observed (or interpreted
differently) by SWPC/USAF:
New region S8747 [S15E76] rotated into view
with tiny spots.
New region S8748 [N31E15] was observed with tiny spots in an
old plage area.
New region S8749 [S02W17] emerged with tiny spots.
New region S8750 [S32W32] emerged with a tiny spot.
C2+ flares:
| Magnitude | Peak time (UT) | Location | Source | Recorded by | Comment |
| C5.6 | 00:20 | S12W21 | 13366 | GOES16 | |
| C2.4 | 01:11 | 13361 | GOES16 | ||
| C2.2 | 01:53 | 13361 | GOES16 | ||
| C2.5 | 02:07 | 13361 | GOES16 | ||
| C2.0 | 03:34 | 13363 | GOES16 | ||
| C2.0 | 08:37 | 13363 | GOES16 | ||
| C3.8 | 11:21 | 13366 | GOES16 | ||
| C4.1 | 11:45 | 13366 | GOES16 | ||
| C2.1 | 12:41 | southeast limb | S8747 | GOES16 | |
| C4.4 | 13:59 | 13359 | GOES16 | ||
| C2.4 | 16:41 | 13368 | GOES16 | ||
| C2.2 | 17:20 | 13366 | GOES16 | ||
| C3.7 | 18:12 | S26W52 | 13359 | GOES16 | |
| C2.1 | 21:04 | S8747 | GOES16 | ||
| C2.3 | 22:04 | 13361 | GOES16 | ||
| C6.8 | 23:20 | 13366 | GOES16 | ||
| C6.6 | 23:39 | 13368 | GOES16 | attributed to AR 13358 by SWPC | |
| C6.2 | 23:54 | 13366 | GOES16 |
July 7-9: 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 recurrent northern hemisphere coronal hole (CH1159) will likely rotate across the central meridian on July 10. CH1159 has lost a large part of its area over the last days due to the development of AR 13367.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over upper middle and high latitudes is poor to fair. Propagation on long distance northeast-southwest paths is poor.
A mostly quiet geomagnetic field is expected on July 10-12. Quiet to active is likely on July 13-14 due to effects from CH1159.
| 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 | ||||||||||
| 13357 | 2023.06.30 2023.07.01 |
S07W76 | location: S07W71 | ||||||||
| 13358 | 2023.06.30 2023.07.01 |
1 | 6 | 1 | S13W50 | 0010 | AXX | BXO |
 |
 |
location: S12W51 |
| 13359 | 2023.06.30 2023.07.01 |
6 | 8 | 2 | S22W54 | 0010 | BXO | BXO |
 |
 |
location: S21W52 area: 0020 |
| 13366 | 2023.06.30 2023.07.07 |
10 | 23 | 14 | S10W38 | 0120 | DSI | DSI |
 |
 |
area: 0210 location: S11W40 |
| 13360 | 2023.06.30 2023.07.01 |
6 | 17 | 8 | N23W46 | 0030 | DRI | DRI |
 |
 |
location: N22W44 |
| S8724 | 2023.07.02 | N09W53 | |||||||||
| 13368 | 2023.07.02 2023.07.09 |
5 | 23 | 13 | S19W33 | 0030 | DRI | DRI |
 |
 |
area: 0120 |
| S8726 | 2023.07.02 | S37W53 | |||||||||
| 13361 | 2023.07.02 2023.07.04 |
13 | 35 | 20 | N24W26 | 0250 | EHI | EAC |
 |
 |
beta-gamma-delta location: N23W23 area: 0400 |
| S8730 | 2023.07.03 | N18W37 | |||||||||
| 13362 | 2023.07.04 2023.07.05 |
2 | 3 | 2 | S09E06 | 0050 | HSX | HSX |
 |
 |
location: S09E09 area: 0080 |
| S8733 | 2023.07.04 | N30W23 |
 |
||||||||
| 13363 | 2023.07.05 2023.07.06 |
2 | 28 | 13 | S21E30 | 0320 | HKX | CKO |
 |
 |
location: S22E32 area: 0900 |
| 13364 | 2023.07.05 2023.07.06 |
1 | 3 | 1 | N24E15 | 0010 | AXX | CRO |
 |
 |
location: N23E17 |
| 13365 | 2023.07.05 2023.07.07 |
2 | 2 | 1 | S36W48 | 0010 | AXX | AXX |
 |
 |
area: 0005 location: S35W49 |
| S8739 | 2023.07.06 | 7 | 1 | N09W25 | 0012 | BXO |
 |
||||
| S8741 | 2023.07.06 | N46W01 | |||||||||
| 13367 | 2023.07.07 2023.07.08 |
10 | 28 | 18 | N10E01 | 0080 | DAI | DAI |
 |
 |
area: 0240 location: N09E01 |
| S8743 | 2023.07.07 | N24W08 | |||||||||
| S8744 | 2023.07.07 | S05W43 | |||||||||
| 13369 | 2023.07.08 2023.07.09 |
5 | 19 | 8 | S18W23 | 0030 | DRO | DRI |
 |
 |
area: 0110 |
| S8746 | 2023.07.08 | S29E10 |
 |
||||||||
| S8747 | 2023.07.09 | 4 | 3 | S15E76 | 0030 | CRO |
 |
||||
| S8748 | 2023.07.09 | 3 | N31E19 | 0005 | BXO |
 |
|||||
| S8749 | 2023.07.09 | 2 | S02W17 | 0002 | AXX |
 |
|||||
| S8750 | 2023.07.09 | 1 | S32W32 | 0001 | AXX |
 |
|||||
| Total spot count: | 63 | 212 | 105 | ||||||||
| Sunspot number: | 183 | 382 | 245 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 107 | 257 | 150 | (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): | 201 | 210 | 196 | ||||||||
| 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 |
| 2021.12 | 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 | 106.6 (+5.6) | 10.99 |
| 2023.01 | 182.4 | 176.6 | 143.6 | (113.7 projected, +6.1) | 8.73 |
| 2023.02 | 167.2 | 163.2 | 110.9 | (118.5 projected, +4.8) | 14.48 (current SC25 peak) |
| 2023.03 | 157.2 | 155.6 | 122.6 | (121.6 projected, +3.1) | 14.42 |
| 2023.04 | 145.4 | 146.4 | 96.4 | (127.0 projected, +5.4) | 13.40 |
| 2023.05 | 155.6 | 159.2 | 137.9 | (132.7 projected, +5.7) | 10.67 |
| 2023.06 | 161.7 | 166.8 | 163.4 | (135.9 projected, +3.2) | 8.9 |
| 2023.07 | 165.5 (1) | 41.3 (2A) / 142.2 (2B) / 169.7 (2C) | (135.4 projected, -0.5) | (6.4) | |
| 2023.08 | (136.4 projected, +1.0) | ||||
| 2023.09 | (139.8 projected, +3.4) | ||||
| 2023.10 | (141.6 projected, +1.8) | ||||
| 2023.11 | (144.2 projected max SC25, +2.6) | ||||
| 2023.12 | (143.4 projected, -0.1) | ||||
| 2024.01 | (140.1 projected, -3.3) | ||||
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.
