Last major update issued on July 1, 2007 at 04:05 UTC.
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The geomagnetic field was quiet to unsettled on June 30. Solar wind speed ranged between 447 and 583 km/s (average speed was 514 km/s, increasing 135 km/s over the previous day) under the influence of a high speed stream from CH275.
Solar flux measured at 20h UTC on 2.8 GHz was 74.0. The planetary A index was 6 (STAR Ap - based on the mean of three hour interval ap indices: 5.9). Three hour interval K indices: 32111111 (planetary), 22211111 (Boulder).
The background x-ray flux is below the class A1 level.
At midnight there were 2 spotted regions on the visible solar disk. The solar flare activity level was very low. No C class events were recorded during the day.
Region 10961 added a spot in the western part of the single penumbra
while a few smaller spots disappeared.
Region 10962 was quiet and mostly unchanged.
June 28-30: No obvious fully or partially Earth directed CMEs were observed in LASCO imagery.
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 new trans equatorial coronal hole (CH276) formed while near the center of the visible solar disk on June 29-30.
Processed STEREO 195 image at 23:45 UTC on June 30. The darkest areas on the solar disk are likely coronal holes.
The geomagnetic field is expected to be quiet to unsettled on July 1-3, perhaps with a few active intervals on if there is a disturbance associated with new CH276.
|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.
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|
|10961||2007.06.25||14||6||S12E09||0210||DAC||classification was CAO at midnight, location: S09E08|
|10962||2007.06.28||2||3||S10E37||0030||AXX||location at midnight: S07E35, area: 0010|
|Total spot count:||16||9|
flux at Earth
|International sunspot number||Smoothed sunspot number|
cycle 23 sunspot max.
|2006.12||84.5||13.6||(12.1 predicted, -0.6)|
|2007.01||83.3||16.9||(11.7 predicted, -0.4)|
|2007.02||77.7||10.6||(11.1 predicted, -0.6)|
|2007.03||72.2||4.8||(10.7 predicted, -0.4)|
|2007.04||72.4||3.7||(10.9 predicted, +0.2)|
|2007.05||74.4||11.7||(11.0 predicted, +0.1)|
|2007.06||73.7 (1)||20.7 (2)||(11.3 predicted, +0.3)|
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.