Last major update issued on November 22, 2013 at 06:05 UTC.
[Solar and geomagnetic data - last month (updated
[Solar wind and electron fluence charts (updated daily)]
[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)]
[Graphical comparison of cycles 10, 12, 13, 14, 16 and 24 (last update November 2, 2013)]
[Historical solar and geomagnetic data charts 1954-2006 (last update April 5, 2007)]
[Archived reports since January 2003 (last update November 3, 2013)]
[POES auroral activity level since October
2009 - updated January 26, 2013]
[Solar polar fields vs solar cycles - updated November 2, 2013]
[Presentation 3rd SSN Workshop, Tucson, 2013 (pdf)]
The geomagnetic field was very quiet on November 21. Solar wind speed at SOHO ranged between 302 and 403 km/s.
Solar flux measured at 20h UTC on 2.8 GHz was 141.2 (decreasing 20.2 over the last solar rotation). The 90 day 10.7 flux at 1 AU was 125.6. The Potsdam WDC planetary A index was 1 (STAR Ap - based on the mean of three hour interval ap indices: 0.6). Three hour interval K indices: 00000001 (planetary), 00002200 (Boulder).
The background x-ray flux was at the class B6 level.
At the time of counting spots (see image time) spots were observed in 11 active regions in 2K resolution (SN: 170) and 8 active regions in 1K resolution (SN: 105) SDO images on the visible solar disk.
Region 11895 [S17W77] decayed slowly.
Region 11896 [N10W71] was quiet and stable.
Region 11899 [N06W43] was quiet and stable.
Region 11903 [S11E23] was quiet and stable.
Spotted regions not numbered by SWPC:
S2838 [S11W55] developed slowly and quietly.
S2839 [S17W12] was quiet and stable.
S2843 [N11W09] was quiet and stable.
S2847 [N11W42] emerged as a region to the north of AR 11899.
New region S2849 [N14W39] emerged with a few spots.
New region S2850 [S08W69] emerged with penumbra spots.
New region S2851 [S12E12] emerged with a penumbra spot.
The only noteworthy flare of the day was an M1.2 event at 11:11 UTC from AR 11893 behind the southwest limb.
November 20-21: No obviously Earth directed CMEs were observed in LASCO
November 19: A halo CME was observed after the X1 event in AR 11893. Most of the ejecta was observed off the southwest limb and the south pole. Faint extensions were observed elsewhere.
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
No obvious coronal holes are currently in or near Earth facing positions.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over high and upper middle latitudes is poor to fair. Propagation on long distance northeast-southwest paths is poor.
The geomagnetic field is expected to be quiet on November 22-24. If the CME observed on Nov.19 arrives we could see unsettled and active intervals on Nov.22-23.
|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
includes AR 11897
|11897||2013.11.11||5||S18W72||0040||CSO||magnetically part of 11895|
|Total spot count:||35||60||25|
|Sunspot number:||85||170||105||(total spot count + 10 * number of spotted regions)|
|Weighted SN:||65||89||54||(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):||51||60||58||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|
possibe 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||156.6 (1)||103.8 (2A) / 148.3 (2B) / 89.3 (2C)||(56.6 projected, -2.1)||(6.1)|
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.