Last major update issued on October 20, 2005 at 03:55 UTC.
geomagnetic data - last month (updated daily)]
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 21-23 (last update October 2, 2005)]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22 and 23 (last update October 2, 2005)]
[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update October 2, 2005)]
[Historical solar and geomagnetic data charts 1954-2004 (last update February 1, 2005)]
[Archived reports (last update October 2, 2005)]
The geomagnetic field was quiet to unsettled on October 19. Solar wind speed ranged between 321 and 375 (all day average 343) km/sec.
Solar flux measured at 20h UTC on 2.8 GHz was 77.9. The planetary
index was 7 (STAR Ap - based on the mean of three hour interval ap
Three hour interval K indices: 22222301 (planetary), 32322311 (Boulder).
The background x-ray flux is at the class A2 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 were recorded during the day.
Region 10815 added a few small trailing spots and was quiet.
New region 10816 emerged in the southwest quadrant.
October 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
A recurrent coronal hole (CH193) in the southern hemisphere will likely rotate into an Earth facing position on October 20-21. CH193 did not cause any disturbance during the previous rotation.
Processed SOHO/EIT 284 image at 22:36 UTC on October 19. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet on October 20-22. Quiet to active conditions are possible on October 23-25 due to effects from CH193.
|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 good. Propagation on long distance northeast-southwest paths is poor. Trans Atlantic propagation conditions are normally monitored every night on 1470 kHz. Dominant stations tonight: Radio Vibración (Venezuela), WWNN Boca Raton (FL) and WLAM Lewiston ME. Many stations from mostly Venezuela, Cuba and the USA were heard on other frequencies. WBBM Chicago 780 and CHQR Calgary 770 were both logged.
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|
|10815||2005.10.14||7||6||N08E08||0030||CAO||classification was CSO at midnight|
|10815||2005.10.14||3||1||S14W29||0020||BXO||classification was AXX at midnight, area 0000|
|Total spot count:||10||7|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|2005.04||86.0||24.4||(31.9 predicted, -1.6)|
|2005.05||99.3||42.6||(29.4 predicted, -2.5)|
|2005.06||93.7||39.6||(28.1 predicted, -1.3)|
|2005.07||96.4||39.9||(26.9 predicted, -1.2)|
|2005.08||90.5||36.4||(25.0 predicted, -1.9)|
|2005.09||91.1||22.1||(23.0 predicted, -2.0)|
|2005.10||78.7 (1)||9.5 (2)||(21.0 predicted, -2.0)|
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.