Last major update issued on March 4, 2006 at 05:25 UTC.
geomagnetic data - last month (updated daily)]
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 21-23 (last update March 2, 2006)]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22 and 23 (last update March 2, 2006)]
[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update March 2, 2006)]
[Historical solar and geomagnetic data charts 1954-2005 (last update March 3, 2006)]
[Archived reports (last update March 2, 2006)]
The geomagnetic field was inactive to quiet on March 3. Solar wind speed ranged between 368 and 458 (all day average 412) km/sec.
Solar flux measured at 20h UTC on 2.8 GHz was 75.5. The planetary A index
was 4 (STAR Ap - based on the mean of three hour interval ap
Three hour interval K indices: 10011221 (planetary), 10012201 (Boulder).
The background x-ray flux is below the class A1 level.
At midnight the visible solar disk was spotless (consecutive spotless days: 4). The solar flare activity level was very low. No C class events were recorded during the day.
March 1-3: No obviously fully or partly Earth directed CMEs were observed.
Compare today's report with the situation one solar rotation ago: 28 days ago 27 days ago 26 days ago
A recurrent trans equatorial coronal hole (CH215) appears to have become larger over the last solar rotation and could be in an Earth facing position on March 6-8.
Processed SOHO/EIT 284 image at 01:20 UTC on February 28. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet on March 4-8 while a high speed stream from CH215 could cause ocassionally unsettled to active conditions on March 9-12.
|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.
Long distance low and medium frequency (below 2 MHz) propagation along east-west paths over high and upper middle latitudes is 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: WLAM Lewiston ME. Propagation was best to Cuba with excellent signals noted from several stations (890 Radio Progreso and 930 Radio Surco a.o). Quite a few North American east coast stations were audible at fair to good signal levels.
Compare to the previous day's image.
|Active region||Date numbered||SEC
|Location at midnight||Area||Classification||Comment|
|Total spot count:||0||0|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|2005.09||91.1||21.9||(25.6 predicted, -1.8)|
|2005.10||77.0||8.5||(23.8 predicted, -1.8)|
|2005.11||86.3||18.0||(21.4 predicted, -2.4)|
|2005.12||90.7||41.2||(18.5 predicted, -2.9)|
|2006.01||83.4||15.4||(15.4 predicted, -3.1)|
|2006.02||76.5||4.7||(12.3 predicted, -3.1)|
|2006.03||76.2 (1)||0.0 (2)||(10.1 predicted, -2.2)|
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.