Last major update issued on November 21, 2005 at 04:50 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 quiet to unsettled on November 20. Solar wind speed ranged between 346 and 427 (all day average 381) km/sec under the influence of a low speed stream from CH198.
Solar flux measured at 20h UTC on 2.8 GHz was 96.4. The planetary
index was 7 (STAR Ap - based on the mean of three hour interval ap
Three hour interval K indices: 12321212 (planetary), 12321211 (Boulder).
The background x-ray flux is at the class B1 level.
At midnight there were 3 spotted regions on the visible solar disk. The solar flare activity level was low. A total of 2 C class events was recorded during the day.
Region 10822 decayed slowly as several spots in the intermediate spot section disappeared. Flares:
C2.5 at 07:36 and C1.5 at 15:20 UTC.
Region 10823 decayed and could soon become spotless.
New region 10824 rotated into view on Nov.19 and was numbered by NOAA/SEC the following day. The region could produce C flares.
November 17-19: No obvious fully or partly Earth directed CMEs were observed.
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 01:06 UTC on November 21. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet on November 21-22 and quiet to active on November 23 due to coronal hole effects.
|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 fair to good. 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. On other frequencies stations from Cuba and Florida (790 WAXY, 850 WFTL a.o.) had the best signals.
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|
|10822||2005.11.12||22||14||S08W25||0570||FKI||classification was FKO at midnight|
|10823||2005.11.19||3||3||S17W50||0040||DSO||classification was CRO at midnight, area 0010|
|10824||2005.11.20||1||5||S13E68||0090||HAX||formerly region S607
classification was CAO at midnight, area 0120
|Total spot count:||26||22|
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||86.1 (1)||20.4 (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.