Last major update issued on January 9, 2011 at 03:45 UTC.
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The geomagnetic field was quiet on January 8. Solar wind speed ranged between 566 and 690 km/s under the influence of a high speed coronal hole stream.
Solar flux measured at 20h UTC on 2.8 GHz was 84.8 (down 4.6 over the last solar rotation). The planetary A index was 7 (STAR Ap - based on the mean of three hour interval ap indices: 6.6). Three hour interval K indices: 22122212 (planetary), 22322222 (Boulder).
The background x-ray flux is at the class A7 level.
At midnight UTC the visible solar disk had 6 spotted regions.
Region 11139 was quiet and is at the southwest limb.
Region 11140 lost the small spots which had emerged the previous day.
Region 11142 decayed slowly and quietly.
Region 11143 decayed quietly.
Spotted regions not numbered by NOAA/SWPC:
[S860] This region emerged in the southwest quadrant on January 7. Location at midnight: S15W24
[S861] A new region emerged in the northeast quadrant on January 8. Location at midnight: N16E52
January 6-8: No obviously Earth directed CMEs were observed in LASCO or STEREO images.
Coronal hole 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 trans equatorial coronal hole (CH432) was Earth facing on January 4-5. A recurrent coronal hole (CH433) in the northern hemisphere will rotate into an Earth facing position on January 9-11.
The darkest areas on the solar disk are likely coronal holes.
Long distance low and medium frequency (below 2 MHz) propagation along paths north of due west over high and upper middle latitudes is fair. Propagation on long distance northeast-southwest paths is poor.
The geomagnetic field is expected to be quiet on January 9-11. Effects from CH433 could cause quiet to unsettled conditions on January 12-14.
|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.
Compare to the previous day's image
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 (NASA) / AIA 4500
|Total spot count:||12||16|
|Month||Average measured solar flux||International sunspot number (SIDC)||Smoothed sunspot number||Average ap
|2008.07||65.7 (SF minimum)||0.5||2.8 (-0.4)|
|2009.10||72.6||4.8||7.1 (+0.9)||3.66 / 3.56|
|2009.11||73.6||4.1||7.6 (+0.5)||2.45 / 2.63|
|2009.12||76.7||10.8||8.3 (+0.7)||1.41 / 1.92|
|2010.01||81.1||13.2||9.3 (+1.0)||2.93 / 3.07|
|2010.02||84.7||18.8||10.6 (+1.3)||4.15 / 4.61|
|2010.03||83.4||15.4||12.3 (+1.7)||4.58 / 4.65|
|2010.04||75.9||8.0||14.0 (+1.7)||10.22 / 10.24|
|2010.05||73.8||8.7||15.5 (+1.5)||9.18 / 8.15|
|2010.06||72.5||13.6||16.4 (+0.9)||8.17 / 6.85|
|2010.07||79.8||16.1||(17.0 predicted, +0.6)||6.31 / 5.15|
|2010.08||79.2||19.6||(17.9 predicted, +0.9)||8.49 / 7.77|
|2010.09||81.1||25.2||(19.0 predicted, +1.1)||5.33 / 5.45|
|2010.10||81.6||23.5||(20.7 predicted, +1.7)||6.07 / 6.27|
|2010.11||82.5||21.6||(23.0 predicted, +2.3)||4.80|
|2010.12||84.2||14.5||(25.3 predicted, +2.3)||3.41|
|2011.01||88.8 (1)||12.6 (2A) / 48.8 (2B)||(27.7 predicted, +2.4)||(5.19)|
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 international sunspot number is typically 30-50% lower. 2B) Month average to date.
3) Running average based on the daily SWPC ap indices. Values in red are based on the official NGDC ap indices.
This report has been prepared by Jan Alvestad. It is based on 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.