Last major update issued on October 23, 2014 at 05:50 UTC. Updates will be irregular until October 27.
[Solar and geomagnetic data - last month (updated
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 23-24 (last update October 1, 2014)] [Cycle 24 progress (last update October 1, 2014) ]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22, 23 and 24 (last update October 1, 2014)]
[Graphical comparison of cycles 10, 12, 13, 14, 16 and 24 (last update October 1, 2014)]
[Historical solar and geomagnetic data charts 1954-2006 (last update April 5, 2007)]
[Archived reports since January 2003 (last update October 10, 2014)]
[Noon SDO sunspot count 1K Reference: 4K (large file) (updated daily)]
[POES auroral activity level October
2009 - December 2012]
[Solar polar fields vs solar cycles - updated October 11, 2014]
[Presentations: 3rd SSN Workshop, Tucson, 2013 (pdf) / 4th SSN Workshop, Locarno, 2014]
The geomagnetic field was quiet to active on October 22. Solar wind speed at SOHO ranged between 450 and 563 km/s under the influence of a high speed stream from CH640.
Solar flux at 20h UTC on 2.8 GHz was 216 (increasing 58 over the last solar rotation). The 90 day 10.7 flux at 1 AU was 138.5. The Potsdam WDC planetary A index was 12 (STAR Ap - based on the mean of three hour interval ap indices: 11.5). Three hour interval K indices: 43222322 (planetary), 33334321 (Boulder).
The background x-ray flux is at the class C1 level.
At the time of counting spots (see image time), spots were observed in 9 active regions using 2K resolution (SN: 296) and 8 active regions using 1K resolution (SN: 189) SDO images on the visible solar disk.
Region 12187 [S09W68] was quiet and stable.
Region 12192 [S14E09] continued to gain spots and area. Some penumbral area in the central southern parts disappeared after the X class event. Multiple magnetic delta structures can be observed within the manin penumbral area. Further major flares are possible.
Region 12193 [N04W32] was quiet and mostly stable.
Region 12194 [S12E46] decayed slowly and quietly.
New region 12195 [N08E73] rotated partly into view on October 21 and was numbered the next day by SWPC.
Spotted regions not numbered (or interpreted differently) by SWPC:
S3921 [N14W07] was quiet and stable.
S3925 [S25W23] reemerged with a penumbra spot.
New region S3930 [N08E42] was observed with penumbra spots.
New region S3931 [N13E00] emerged with penumbra spots.
An interesting region just behind the southeast limb displayed significant activity and is obviously capable of producing M class flares.
C2+ flares (GOES):
|Magnitude||Peak time (UTC)||Location||AR||Comment|
October 20-22: No obviously Earth directed CMEs were observed in LASCO and STEREO imagery.
[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 recurrent trans equatorial coronal hole (CH640) was in an Earth facing position on October 19-22.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over 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 October 23-25 due to effects from CH640.
|Coronal holes (1)||Coronal mass ejection (2)||M and X class flares (3)|
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) 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.
|Active region||Date numbered
|Spot count||Location at midnight||Area||Classification||SDO / HMI 4K continuum
image with magnetic polarity overlay
|Total spot count:||73||206||109|
|Sunspot number:||123||296||189||(total spot count + 10 * number of spotted regions)|
|Weighted SN:||103||241||144||(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):||74||104||104||k * (sunspot number). k = 0.6 for SWPC, k = 0.35 for MSN 2K, k = 0.55 for MSN 1K (MSN=Magnetic Sunspot Number)|
|Month||Average solar flux||International sunspot number
|Smoothed sunspot number||Average ap
|166.3||102.3 (cycle peak)||78.4 (+1.1)||10.70|
|2014.04||143.9||144.8||84.7||(82.7 projected, +1.9)||7.88|
|2014.05||129.7||132.9||75.2||(82.3 projected, -0.4)||5.75|
|2014.06||122.0||125.8||71.0||(81.1 projected, -1.2)||6.72|
|2014.07||137.4||141.8||72.5||(79.4 projected, -1.7)||4.50|
|2014.08||124.7||127.9||74.7||(77.1 projected, -2.3)||7.71|
|2014.09||146.2||87.6||(73.8 projected, -3.3)||9.78|
|2014.10||141.3 (1)||58.8 (2A) / 82.9 (2B) / 86.0 (2C)||(71.4 projected, -2.4)||(8.6)|
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 WDC-SILSO 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 GFZ 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.