Last major update issued on June 22, 2005 at 04:40 UTC.
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geomagnetic data - last month (updated daily)]
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[Solar cycles 21-23
(last update June 4, 2005)]
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[Graphical comparison
of cycles 21, 22 and 23 (last update June 4, 2005)]
[Graphical
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[Historical solar and
geomagnetic data charts 1954-2004 (last update February 1, 2005)]
[Archived reports
(last update June 21, 2005)]
The geomagnetic field was inactive to quiet on June 21. Solar wind speed ranged between 339 and 349 km/sec.
Solar flux measured at 20h UTC on 2.8 GHz was 83. The planetary
A
index was 4 (STAR Ap - based on the mean of three hour interval ap
indices: 3.8).
Three hour interval K indices: 10001121 (planetary), 10000011 (Boulder).
The background x-ray flux is at the class A7 level.
At midnight there were 2 spotted regions on the visible solar disk. The solar flare activity level was low. A single C class event was recorded during the day.
Region 10779 decayed further and was quiet. The region will rotate over the southwest limb today.
Region 10780 developed early in the day, then began to decay. Flare: C2.1 at 18:04
UTC.
June 19-21: No obvious fully or partly Earth directed CMEs were observed in available LASCO images.
Coronal hole
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 (CH171) in the northern hemisphere will be in an Earth facing position on June 21-23.
Processed SOHO/EIT 284 image at 01:06 UTC on June 6. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be mostly quiet on June 22-23 becoming unsettled to active on June 24-25 due to a high speed stream from CH171.
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 very poor. Propagation along long distance north-south paths is fair. Trans Atlantic propagation conditions are normally monitored every night on 1470 kHz. Dominant station tonight: Radio Cristal del Uruguay. On other frequencies quite a few stations from Brazil were noted, particularly stations from Ceará (760, 930 kHz and other frequencies) had fair to good 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 spot count |
STAR spot count |
Location at midnight | Area | Classification | Comment |
---|---|---|---|---|---|---|---|
10777 | 2005.06.10 | N05W89 | plage | ||||
10779 | 2005.06.15 | 13 | 11 | S16W71 | 0250 | EAI | classification was EAO at midnight |
10780 | 2005.06.17 | 20 | 20 | S07E12 | 0090 | DAI | |
S560 | 2005.06.16 | N08W28 | plage | ||||
Total spot count: | 33 | 31 | |||||
SSN: | 53 | 51 |
Month | Average solar flux at Earth |
International sunspot number | Smoothed sunspot number |
---|---|---|---|
2000.04 | 184.2 | 125.5 | 120.8 cycle 23 sunspot max. |
2000.07 | 202.3 | 170.1 | 119.8 |
2001.12 | 235.1 | 132.2 | 114.6 (-0.9) |
2004.04 | 101.2 | 39.3 | 45.5 (-1.6) |
2004.05 | 99.8 | 41.5 | 43.8 (-1.7) |
2004.06 | 97.4 | 43.2 | 41.6 (-2.2) |
2004.07 | 119.1 | 51.1 | 40.2 (-1.4) |
2004.08 | 109.6 | 40.9 | 39.2 (-1.0) |
2004.09 | 103.1 | 27.7 | 37.5 (-1.7) |
2004.10 | 105.9 | 48.0 | 35.9 (-1.6) |
2004.11 | 113.2 | 43.5 | 35.3 (-0.6) |
2004.12 | 94.5 | 17.9 | (34.8 predicted, -0.5) |
2005.01 | 102.2 | 31.3 | (32.8 predicted, -2.0) |
2005.02 | 97.2 | 29.1 | (30.4 predicted, -2.4) |
2005.03 | 89.9 | 24.8 | (28.8 predicted, -1.6) |
2005.04 | 86.0 | 24.4 | (26.9 predicted, -1.9) |
2005.05 | 99.3 | 42.6 | (24.3 predicted, -2.6) |
2005.06 | 98.8 (1) | 50.8 (2) | (22.8 predicted, -1.5) |
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.
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