Last major update issued on June 7, 2005 at 04:05 UTC.
geomagnetic data - last month (updated daily)]
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 21-23 (last update June 4, 2005)]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22 and 23 (last update June 4, 2005)]
[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update June 4, 2005)]
[Historical solar and geomagnetic data charts 1954-2004 (last update February 1, 2005)]
[Archived reports (last update June 4, 2005)]
The geomagnetic field was quiet to active on June 6. Solar wind speed ranged between 429 and 642 km/sec.
Solar flux measured at 20h UTC on 2.8 GHz was 106.0. The planetary
index was 13 (STAR Ap - based on the mean of three hour interval ap
Three hour interval K indices: 33311234 (planetary), 33311123 (Boulder).
The background x-ray flux is at the class B2 level.
At midnight there were 5 spotted regions on the visible solar disk. The solar flare activity level was low. A total of 4 C class events was recorded during the day.
Region 10772 did not change much and remains capable of producing occasional C flares. Flares:
C1.1/1F at 03:43 and C1.2 at 18:53 UTC.
Region 10773 add a few intermediate spots and was quiet.
Region 10774 decayed slowly and quietly.
Region 10775 was mostly unchanged and quiet.
Region 10776 was generally unchanged and still has the potential to produce a minor M class flare. Flares: C1.1 at 04:28 and C1.0 at 12:07 UTC.
June 4-6: No obvious fully or partly Earth directed CMEs were observed in LASCO images.
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 large, recurrent coronal hole (CH169) in the northern hemisphere with a trans equatorial extension was in an Earth facing position on June 1-3.
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 quiet to active on June 7 and quiet to unsettled on June 8-10.
|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 Argentina were noted, 1510 kHz had both Radio Belgrano and Radio Champaquí.
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|
|10772||2005.05.31||10||21||S18W30||0130||DAO||classification was DAI at midnight|
classification was DSO at midnight, area 0030
|10775||2005.06.04||7||6||N12E48||0180||CAO||classification was DAO at midnight, area 0210, location: N11E46|
|10776||2005.06.05||7||9||S05E61||0300||EAO||classification was DAO at midnight, area 0410|
|Total spot count:||39||53|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|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||99.0 (1)||15.3 (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% 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.