Last major update issued on June 8, 2005 at 03:55 UTC.
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The geomagnetic field was quiet to minor storm on June 7. Solar wind speed ranged between 431 and 520 km/sec.
Solar flux measured at 20h UTC on 2.8 GHz was 109.1. The planetary
A
index was 18 (STAR Ap - based on the mean of three hour interval ap
indices: 17.9).
Three hour interval K indices: 45423233 (planetary), 35433223 (Boulder).
The background x-ray flux is at the class B3 level.
At midnight there were 6 spotted regions on the visible solar disk. The solar flare activity level was low. A total of 2 C class events was recorded during the day.
Region 10772 decayed slowly. Flare: C3.0 at 13:42 UTC.
Region 10773 decayed as all intermediate spots disappeared.
Region 10774 decayed slowly and quietly.
Region 10775 added a few small spots near the main penumbra.
Region 10776 developed quickly and became a compact region as many new intermediate spots emerged. By midnight a weak
magnetic delta structure had formed in the central part of the region. Further growth will increase the chances of a major flare. Flare:
C2.5 at 19:14 UTC.
Spotted regions not numbered by NOAA/SEC:
[S555] This region emerged in the southeast quadrant on June 7 near the central meridian. Location at midnight: S03W01.
The region appeared to be decaying late in the day.
June 5-7: No obvious fully or partly Earth directed CMEs were observed in 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
No obvious coronal holes are currently near Earth facing positions.
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 8 and quiet to unsettled on June 9-10.
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. At least two stations from Argentina were noted as well. On 1510 kHz Radio Rincón (Uruguay) was best near midnight UTC, later Radio Champaquí (Argentina) dominated before Radio Belgrano (Argentina) became the strongest signal after 03h UTC.
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 |
---|---|---|---|---|---|---|---|
10769 | 2005.05.28 | S06W44 | plage | ||||
10772 | 2005.05.31 | 13 | 13 | S18W44 | 0130 | EAO | classification was DAI at midnight |
10773 | 2005.06.01 | 5 | 3 | S14W04 | 0130 | DAO | |
10774 | 2005.06.04 | 4 | 2 | N04W45 | 0040 | CAO | classification was HAX at midnight, area 0020 |
10775 | 2005.06.04 | 6 | 11 | N10E35 | 0240 | CAO | |
10776 | 2005.06.05 | 16 | 26 | S06E47 | 0490 | EKO |
beta-delta classification was EKC at midnight, area 0570 |
S555 | 2005.06.07 | 1 | S03W01 | 0010 | AXX | ||
Total spot count: | 44 | 56 | |||||
SSN: | 94 | 116 |
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 | 100.4 (1) | 18.4 (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.
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