Solar Terrestrial Activity Report

Last major update issued on June 25, 2006 at 03:55 UTC.

[Solar and geomagnetic data - last month (updated daily)]
[Solar wind and electron fluence charts (updated daily)]
[Solar cycles 21-23 (last update June 7, 2006)]
[Solar cycles 1-20]
[Graphical comparison of cycles 21, 22 and 23 (last update June 7, 2006)]
[Graphical comparison of cycles 2, 10, 13, 17, 20 and 23 (last update June 7, 2006)]
[Historical solar and geomagnetic data charts 1954-2005 (last update March 3, 2006)]
[Archived reports (last update June 5, 2006)]

Recent activity

The geomagnetic field was inactive to quiet on June 24. Solar wind speed ranged between 272 and 330 km/s (all day average 290 km/s - decreasing 32 km/s from the previous day).

Solar flux measured at 20h UTC on 2.8 GHz was 73.6. The planetary A index was 4 (STAR Ap - based on the mean of three hour interval ap indices: 4.0).
Three hour interval K indices: 10011222 (planetary), 10002113 (Boulder).

The background x-ray flux is at the class A3 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.

Spotted regions not numbered by NOAA/SEC:
[S664] A new region rotated partly into view at the northeast limb late on June 24. Occasional C flares are possible. Location at midnight: N07E83

Coronal mass ejections (CMEs)

June 22-24: No partly or fully Earth directed CMEs were detected in LASCO imagery.

Coronal holes

Coronal hole history (since late October 2002)
Compare today's report to the situation one solar rotation ago: 28 days ago 27 days ago 26 days ago

A recurrent trans equatorial coronal hole (CH229) will likely be in an Earth facing position from late on June 24 until noon on June 26.

Processed SOHO/EIT 284 image at 01:06 UTC on June 25. The darkest areas on the solar disk are likely coronal holes.

Forecast

The geomagnetic field is expected to be mostly quiet on June 25-26 and quiet to active on June 27-29 due to effects from CH229.

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.

Propagation

Long distance low and medium frequency (below 2 MHz) propagation along east-west paths over high and upper middle latitudes is poor. Propagation on long distance northeast-southwest paths is fair to good. Trans Atlantic propagation conditions are normally monitored every night on 1470 kHz. Radio Cristal del Uruguay was the dominant signal and was occasionally quite strong. Propagation was best just before LSR and favored stations from Argentina and Uruguay.

Active solar regions (Recent map)

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
10895 2006.06.17     N00W82     plage
10896 2006.06.17     S10W64     plage
S664 2006.06.24   4 N07E83 0040 DAO  
Total spot count: 0 4  
SSN: 0 14  

Monthly solar cycle data

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)
2005.04 86.0 24.2 31.6 (-1.9)
2005.05 99.3 42.7 28.9 (-2.7)
2005.06 93.7 39.3 28.8 (-0.1)
2005.07 96.4 40.1 29.1 (+0.3)
2005.08 90.5 36.4 27.4 (-1.7)
2005.09 91.1 21.9 25.8 (-1.6)
2005.10 77.0 8.5 25.5 (-0.3)
2005.11 86.3 18.0 24.9 (-0.6)
2005.12 90.7 41.2 (22.8 predicted, -2.1)
2006.01 83.4 15.4 (20.1 predicted, -2.7)
2006.02 76.5 4.7 (17.1 predicted, -3.0)
2006.03 75.4 10.8 (15.1 predicted, -2.0)
2006.04 89.0 30.2 (14.4 predicted, -0.7)
2006.05 80.9 22.2 (13.5 predicted, -0.9)
2006.06 75.5 (1) 18.7 (2) (11.4 predicted, -2.1)

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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