Last major update issued on December 1, 2013 at 05:40 UTC.
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[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22, 23 and 24 (last
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[Presentation
3rd
SSN Workshop, Tucson, 2013 (pdf)]
The geomagnetic field was quiet to unsettled on November 30. Solar wind speed at SOHO ranged between 338 and 552 km/s. The weak disturbance that began on Nov.29 continued most of the day. At about 20:20 UTC at ACE there was a step change in solar wind speed and the total field of the interplanetary magnetic field, likely the arrival of the CME observed on November 27. The geomagnetic field was at unsettled to active levels after the arrival of this disturbance.
Solar flux measured at 20h UTC on 2.8 GHz was 131.2 (decreasing 12.3 over the last solar rotation). The 90 day 10.7 flux at 1 AU was 127.0. The Potsdam WDC planetary A index was 8 (STAR Ap - based on the mean of three hour interval ap indices: 7.9). Three hour interval K indices: 11122233 (planetary), 11232223 (Boulder).
The background x-ray flux was at the class B3 level.
At the time of counting spots (see image time) spots were observed in 13 active regions in 2K resolution (SN: 243) and 10 active regions in 1K resolution (SN: 156) SDO images on the visible solar disk.
Region 11906 [S15W27] was quiet and stable.
Region 11907 [S09W34] decayed further and was quiet.
Region 11908 [S26E06] was quiet and stable.
Region 11909 [S17E32] developed slowly as new flux emerged in the
northwestern part of the region. While the region magnetically isn't complex,
there's a chance of C flares and a minor M class flare.
Region 11910 [N01W40] developed with new flux emerging and several spots
forming.
New region 11911 [N12E16] emerged on November 29 and developed further on
Nov.30 when it was numbered by SWPC. C flares are possible.
Spotted regions not numbered by SWPC:
S2868 [S18E08] developed slowly and quietly.
New region S2870 [S13E47] emerged early in the day with penumbra spots.
New region S2871 [N22E67] emerged early in the day with penumbra spots.
New region S2872 [N24E13] emerged with a penumbra spot.
New region S2873 [N15E08] emerged with penumbra spots.
New region S2874 [S07E16] emerged with a single
spot.
New region S2875 [N08W30] emerged with penumbra spots.
November 28-30: No obviously Earth directed CMEs were observed in LASCO and STEREO imagery, many CMEs with a backsided origin was 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 coronal hole (CH595) was in an Earth facing position on November 30 - December 1, however, the coronal hole is small and may be too far to the north to cause geomagnetic effects. A trans equatorial coronal hole (CH596) could rotate to a potentially geoeffective position on December 3-4.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over high and upper middle latitudes is poor. Propagation on long distance northeast-southwest paths is fair.
The geomagnetic field is expected to be quiet to unsettled on December 1 and quiet on December 2-3.
| 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: 0-20% probability, Yellow: 20-60% probability, Red: 60-100% probability.
(Click on image for 2K 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 numbered solar regions according to the Solar Region Summary provided by NOAA/SWPC. 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.
| Active region | Date numbered detected |
Spot count | Location at midnight | Area | Classification | SDO / HMI 4K continuum image with magnetic polarity overlay |
Comment | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| SWPC | STAR SDO | SWPC | STAR | Current | Previous | ||||||
| 2K | 1K | ||||||||||
| 11903 | 2013.11.17 | 1 | S11W94 | 0030 | HSX |
 |
rotated out of view | ||||
| 11907 | 2013.11.22 2013.11.26 |
10 | 6 | 4 | S09W38 | 0060 | CAO | CAO |
 |
 |
location: S09W34 |
| 11905 | 2013.11.22 2013.11.23 |
N18W21 | plage | ||||||||
| 11906 | 2013.11.23 2013.11.25 |
6 | 1 | S17W28 | 0014 | BXO |
 |
 |
location: S15W27 | ||
| 11908 | 2013.11.26 2013.11.27 |
6 | 21 | 10 | S26E01 | 0180 | DAO | EAI |
 |
 |
area: 0380 location: S26E06 |
| 11909 | 2013.11.26 2013.11.27 |
17 | 35 | 21 | S18E31 | 0330 | DKC | ESC |
 |
 |
area: 0550 location: S17E32 |
| 11910 | 2013.11.27 2013.11.28 |
4 | 12 | 6 | N01W41 | 0010 | BXO | DRI |
 |
 |
area: 0080 |
| S2862 | 2013.11.27 | S05W46 | plage | ||||||||
| S2863 | 2013.11.27 | N22E11 | plage | ||||||||
| S2864 | 2013.11.27 | S08W29 | plage | ||||||||
| S2865 | 2013.11.27 | S66E05 | plage | ||||||||
| S2866 | 2013.11.28 | S30E30 | plage | ||||||||
| 11911 | 2013.11.29 2013.11.28 |
4 | 16 | 8 | S12E16 | 0020 | CSO | DAI |
 |
 |
area: 0090 |
| S2868 | 2013.11.29 | 3 | 2 | S18E08 | 0012 | CRO |
 |
 |
|||
| S2869 | 2013.11.29 | S13W54 |
 |
plage | |||||||
| S2870 | 2013.11.30 | 4 | 1 | S13E47 | 0011 | BXO |
 |
||||
| S2871 | 2013.11.30 | 3 | 2 | N22E67 | 0020 | BXO |
 |
||||
| S2872 | 2013.11.30 | 1 | N24E13 | 0002 | AXX |
 |
|||||
| S2873 | 2013.11.30 | 3 | N15E08 | 0006 | BXO |
 |
|||||
| S2874 | 2013.11.30 | 1 | 1 | S07E16 | 0006 | AXX |
 |
||||
| S2875 | 2013.11.30 | 2 | N08W30 | 0005 | BXO |
 |
|||||
| Total spot count: | 42 | 113 | 56 | ||||||||
| Sunspot number: | 102 | 243 | 156 | (total spot count + 10 * number of spotted regions) | |||||||
| Weighted SN: | 72 | 139 | 82 | (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): | 61 | 85 | 86 | k * (sunspot number). k = 0.6 for SWPC, k = 0.35 for STAR SDO 2K, k = 0.55 for STAR SDO 1K | |||||||
| Month | Average measured solar flux | International sunspot number (SIDC) | Smoothed sunspot number | Average ap (3) |
|---|---|---|---|---|
| 2011.11 | 153.5 (cycle peak) | 96.7 (cycle peak) | 61.1 (+1.2) | 5.55 |
| 2012.02 | 106.5 | 32.9 | 66.9 (+1.4) possibe cycle 24 max |
8.81 |
| 2012.07 | 133.9 | 66.5 | 57.8 (-1.1) | 13.90 |
| 2012.08 | 115.4 | 63.0 | 58.2 (+0.4) | 7.96 |
| 2012.09 | 122.9 | 61.4 | 58.1 (-0.1) | 8.07 |
| 2012.10 | 123.3 | 53.3 | 58.6 (+0.5) | 9.97 |
| 2012.11 | 121.3 | 61.8 | 59.7 (+1.1) | 7.08 |
| 2012.12 | 108.6 | 40.8 | 59.6 (-0.1) | 3.44 |
| 2013.01 | 127.1 | 62.9 | 58.7 (-0.9) | 4.69 |
| 2013.02 | 104.3 | 38.0 | 58.4 (-0.3) | 6.11 |
| 2013.03 | 111.3 | 57.9 | 57.5 (-0.9) | 10.56 |
| 2013.04 | 124.8 | 72.4 | 57.9 (+0.4) | 5.40 |
| 2013.05 | 131.4 | 78.7 | (59.3 projected, +1.4) | 9.73 |
| 2013.06 | 110.1 | 52.5 | (59.7 projected, +0.4) | 12.60 |
| 2013.07 | 115.5 | 57.0 | (60.0 projected, +0.3) | 9.47 |
| 2013.08 | 114.6 | 66.0 | (60.3 projected, +0.3) | 8.27 |
| 2013.09 | 102.6 | 36.9 | (60.2 projected, -0.1) | 5.23 |
| 2013.10 | 132.1 | 85.6 | (58.7 projected, -1.5) | 7.71 |
| 2013.11 | 148.3 (1) | 125.6 (2A/2B) / 80.6 (2C) | (56.6 projected, -2.1) | (5.7) |
1) Running average based on the daily 20:00 UTC observed solar flux value at
2800 MHz.
2A) Current impact on the monthly sunspot number based on the Boulder
(NOAA/SWPC) sunspot number (accumulated daily sunspots / month days). The
official SIDC international sunspot number is typically 30-50% lower. 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 Potsdam
WDC
ap indices.
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 the UTC day. Comments and suggestions are always welcome.
SDO images are courtesy of NASA/SDO and the AIA, EVE, and HMI science teams.
