Last major update issued on November 12, 2013 at 05:05 UTC.
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[Solar cycles 23-24 (last update November 2, 2013)] [Cycle 24 progress (last update November 2, 2013) ]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22, 23 and 24 (last update November 2, 2013)]
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[Presentation 3rd SSN Workshop, Tucson, 2013 (pdf)]
The geomagnetic field was quiet to active on November 11. Solar wind speed at SOHO ranged between 429 and 598 km/s.
Solar flux measured at 20h UTC on 2.8 GHz was 163.7 (increasing 38.4 over the last solar rotation). The 90 day 10.7 flux at 1 AU was 122.3. The Potsdam WDC planetary A index was 15 (STAR Ap - based on the mean of three hour interval ap indices: 15.4). Three hour interval K indices: 44433321 (planetary), 44442321 (Boulder).
The background x-ray flux was at the class C1 level.
At the time of counting spots (see image time) spots were observed in 7 active regions in 2K resolution (SN: 169) and 5 active regions in 1K resolution (SN: 100) SDO images on the visible solar disk.
Region 11890 [S11W42] decayed further but could
still produce another major flare due to the persistent magnetic delta structure
in a trailing penumbra.
C5+ flares: C6.4 at 00:32, C7.8 at 00:48, C5.0 at
Region 11892 [S07W03] was quiet and stable.
Region 11893 [S13E29] developed slowly and has polarity intermixing. C and minor M class flaring is possible.
Region 11895 [S19E62] is a large region with many spots and polarity intermixing. Further M class flares are possible. C5+ flare: M2.4 at 11:18 UTC.
Region 11896 [N10E62] was quiet and stable.
New region 11898 [S27E12] emerged on November 8 and was numbered by SWPC 3 days later.
Spotted regions not numbered by SWPC:
S2803 [N05W39] was quiet and stable.
Active regions at the northeast limb will rotate into view today. The regions are contributing to a significant increase in solar flux. Major flares are possible.
November 9, 11: No obviously Earth directed CMEs were observed in LASCO
November 10: Only a small CME was observed after the X1 flare in AR 11890. As most of the ejected material was observed off the south pole it is uncertain if the CME will have any terrestrial effects.
Coronal hole history (since October
Compare today's report to the situation one solar rotation ago: 28 days ago 27 days ago 26 days ago
A coronal hole (CH594) in the northern hemisphere will likely rotate into an Earth facing position on November 12-13.
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 November 12-14. A high speed stream from CH594 could reach Earth on November 15 and cause unsettled and active 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
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
|Spot count||Location at midnight||Area||Classification||SDO / HMI 4K continuum
image with magnetic polarity overlay
|11897||2013.11.11||7||S18E64||0240||DAI||magnetically part of 11895|
|Total spot count:||44||99||50|
|Sunspot number:||104||169||100||(total spot count + 10 * number of spotted regions)|
|Weighted SN:||74||142||93||(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):||62||59||55||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
|2011.11||153.5 (cycle peak)||96.7 (cycle peak)||61.1 (+1.2)||5.55|
likely cycle 24 max
|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||149.1 (1)||46.7 (2A) / 127.4 (2B) / 87.1 (2C)||(56.6 projected, -2.1)||(7.6)|
1) Running average based on the daily 20:00 UTC observed solar flux value at
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.