Last major update issued on January 9, 2007 at 04:50 UTC.
geomagnetic data - last month (updated daily)]
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[Solar cycles 21-23 (last update November 12, 2006)]
[Solar cycles 1-20]
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[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update November 12, 2006)]
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The geomagnetic field was quiet on January 8. Solar wind speed ranged between 306 and 353 km/s (all day average 347 km/s - decreasing 48 km/s compared to the previous day).
Solar flux measured at 20h UTC on 2.8 GHz was 88.0. The planetary A index was 4 (STAR Ap - based on the mean of three hour interval ap indices: 3.6). Three hour interval K indices: 02001121 (planetary), 03001101 (Boulder).
The background x-ray flux is at the class A5 level.
At midnight there were 3 spotted regions on the visible solar disk. The solar flare activity level was very low. No C class events were recorded during the day.
Region 10933 developed quickly as new negative polarity flux emerged
just to the northwest of the main penumbra. The separation between the opposite
polarity areas have decreased. If this development continues the region could
soon begin producing C and M flares.
Region 10935 was quiet and stable.
New region 10937 emerged in the southeast quadrant on January 7 and was numbered the next day by NOAA/SEC. Slow development was observed on January 8. This is likely a cycle 24 region.
January 6-8: No obvious partly or fully Earth directed CMEs were detected in LASCO imagery.
history (since late October 2002)
Compare today's report to the situation one solar rotation ago: 28 days ago 27 days ago 26 days ago
A recurrent coronal hole (CH255) in the southern hemisphere will likely rotate into an Earth facing position on January 12-14.
Processed SOHO/EIT 195 image at 15:48 UTC on January 8. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet on January 9-13.
|Coronal holes (1)||Coronal mass ejections (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.
Monitoring has been temporarily suspended (as of January 1, 2007).
Compare to the previous day's image.
Data for all numbered solar regions according to the Solar Region Summary provided by NOAA/SEC. 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 SEC or where SEC has observed no spots. SEC active region numbers in the table below and in the active region map above are the historic SEC/USAF numbers.
|Active region||Date numbered||SEC
|Location at midnight||Area||Classification||Comment|
|10933||2006.12.30||8||15||S05W44||0230||CKI||classification was DAI at midnight|
|10937||2007.01.08||2||5||S14E07||0020||CSO||formerly region S689|
|Total spot count:||12||21|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|2006.07||75.7||12.2||(15.0 predicted, -1.3)|
|2006.08||79.0||12.9||(14.9 predicted, -0.1)|
|2006.09||77.8||14.5||(14.7 predicted, -0.2)|
|2006.10||74.3||10.4||(13.5 predicted, -1.2)|
|2006.11||86.3||21.5||(12.1 predicted, -1.4)|
|2006.12||84.5||13.6||(11.7 predicted, -0.4)|
|2007.01||87.4 (1)||10.3 (2)||(11.9 predicted, +0.2)|
1) Running average based on the
daily 20:00 UTC observed solar flux
value at 2800 MHz.
2) Unofficial, accumulated value based on the Boulder (NOAA/SEC) sunspot number. The official international sunspot number is typically 30-50% lower.
This report has been prepared by Jan Alvestad. It is based partly on my own observations and analysis, and partly on data from some of these solar data sources. All time references are to the UTC day. Comments and suggestions are always welcome.