Last major update issued on March 3, 2005 at 05:00 UTC.
geomagnetic data - last month (updated daily)]
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 21-23 (last update March 3, 2005)]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22 and 23 (last update March 3, 2005)]
[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update March 3, 2005)]
[Historical solar and geomagnetic data charts 1954-2004 (last update February 1, 2005)]
[Archived reports (last update February 16, 2005)]
The geomagnetic field was quiet to unsettled on March 2. Solar wind speed ranged between 564 and 749 km/sec under the influence of a high speed stream from CH148. Wind speed decreased slowly and gradually after 07h UTC.
Solar flux measured at 20h UTC on 2.8 GHz was 74.6. The planetary
index was 12 (STAR Ap - based on the mean of three hour interval ap
Three hour interval K indices: 33333311 (planetary), 33333311 (Boulder).
The background x-ray flux is at the class A4 level.
At midnight there was 1 spotted region on the visible solar disk. The solar flare activity level was very low. No C class events were recorded during the day.
New region 10740 emerged in the southwest quadrant on March 1 and was numbered by SEC the next day. The region decayed slightly on March 2.
February 28-March 2: 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 (CH149) in the northern hemisphere will likely rotate to a geoeffective position on March 3-5. A small recurrent trans equatorial coronal hole (CH150) was in a geoeffective position on March 2.
Processed SOHO/EIT 284 image at 01:06 UTC on March 2. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet on March 3-4. Weak effects from CH150 are possible on March 5 with occasional unsettled and active intervals. A stronger disturbance from CH149 could arrive on March 6 or 7 and cause unsettled to minor storm conditions.
|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. Propagation along long distance north-south paths is poor. Trans Atlantic propagation conditions are normally monitored every night on 1470 kHz. Dominant stations tonight: Radio Vibración (Venezuela) and WWNN Boca Raton FL. Quite a few stations from the Canadian Atlantic provinces, the northeastern US, Florida, Cuba, Puerto Rico and Venezuela were heard on other frequencies with the strongest signals noted from the usual Newfoundland stations.
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|
|10740||2005.03.02||1||1||S07W24||0020||HSX||formerly region S520|
|Total spot count:||1||1|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|2004.09||103.1||27.7||(37.4 predicted, -1.8)|
|2004.10||105.9||48.4||(35.2 predicted, -2.2)|
|2004.11||113.2||43.7||(33.3 predicted, -1.9)|
|2004.12||94.5||17.9||(31.0 predicted, -2.3)|
|2005.01||102.2||31.3||(28.3 predicted, -2.7)|
|2005.02||97.2||29.1||(25.9 predicted, -2.4)|
|2005.03||74.2 (1)||0.7 (2)||(24.1 predicted, -1.8)|
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% less.
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.