Last major update issued on November 23, 2005 at 05:45 UTC.
geomagnetic data - last month (updated daily)]
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 21-23 (last update November 9, 2005)]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22 and 23 (last update November 9, 2005)]
[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update November 9, 2005)]
[Historical solar and geomagnetic data charts 1954-2004 (last update February 1, 2005)]
[Archived reports (last update November 2, 2005)]
The geomagnetic field was very quiet to quiet on November 22. Solar wind speed ranged between 296 and 341 (all day average 315) km/sec. A low speed stream from CH199 arrived late on November 22.
Solar flux measured at 20h UTC on 2.8 GHz was 92.6. The planetary
index was 6 (STAR Ap - based on the mean of three hour interval ap
Three hour interval K indices: 01222222 (planetary), 11322211 (Boulder).
The background x-ray flux is at the class A8 level.
At midnight there were 2 spotted regions on the visible solar disk. The solar flare activity level was very low. No C class events was recorded during the day.
Region 10822 decayed slowly in the trailing and intermediate spot sections. A few new spots emerged just to the
east of the main penumbra. C flares are possible.
Region 10824 developed slowly and quietly.
November 20-22: No obvious fully or partly Earth directed CMEs were observed. A complex full halo CME was observed on Nov.21, its origin was most likely backsided.
history (since late October 2002)
Compare today's report with the situation one solar rotation ago: 28 days ago 27 days ago 26 days ago
The northernmost extension of a southern hemisphere coronal hole (CH199) was in a potentially geoeffective position on November 20.
Processed SOHO/EIT 284 image at 13:06 UTC on November 22. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet to active on November 23 due to coronal hole effects and quiet to unsettled on November 24-25.
|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) Material from a CME is likely to impact 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.
Long distance low and medium frequency (below 2 MHz) propagation along east-west paths over high and upper middle latitudes is poor to fair. Propagation on long distance northeast-southwest paths is poor. Trans Atlantic propagation conditions are normally monitored every night on 1470 kHz. Dominant station tonight: WWNN Pompano Beach FL. Some stations from the eastern and southernmost parts of the USA were heard with fair signals with the best propagation for stations in or near Boston, New York and Miami.
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|
|Total spot count:||16||28|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|2005.05||99.3||42.6||(28.9 predicted, -2.7)|
|2005.06||93.7||39.6||(27.3 predicted, -1.6)|
|2005.07||96.4||39.9||(26.1 predicted, -1.2)|
|2005.08||90.5||36.4||(24.3 predicted, -1.8)|
|2005.09||91.1||22.1||(22.2 predicted, -2.1)|
|2005.10||77.0||8.5||(20.2 predicted, -2.0)|
|2005.11||86.8 (1)||23.1 (2)||(17.8 predicted, -2.4)|
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.