> :Issued: 2005 Apr 18 1203 UTC
> :Product: documentation at http://sidc.oma.be/products/bul
> #--------------------------------------------------------------------#
> # SIDC Weekly bulletin on Solar and Geomagnetic activity #
> #--------------------------------------------------------------------#
> WEEK 224 from 2005 Apr 11
>
> SOLAR ACTIVITY
> --------------
> This week was good for 3 days with C-flares: April 11 (1), 12 (1) and 17
> (4).
> Group 52 (NOAA 751) produced a C1.0 flare on April 11. The C2.0 flare of
> April 12 came from sunspot group 52/(NOAA) 0752. The group stayed fairly
> quiet, producing only one more C-flare on April 17. From April 13 up to
> April 16,
> we had a C-flare silence. On April 16, some B-flare activity came from
> behind
> the east-limb resulting in 3 C-flares on April 17. The group came into
> view on
> April 17 and got the Catania nr 55 (NOAA 0755). Several small CMEs with an
> angular width smaller than 70° were identified by CACTus to come from the
> solar
> region were this active region is located.
> A recurrent northern coronal hole was located at the central meridian on
> April 9. The
> solar wind speed increased from April 11 to reach the maximum value of 600
> km/s
> on April 13.
>
>
> GEOMAGNETIC ACTIVITY
> --------------------
> The coronal hole mentioned above became geoeffective from late April 11.
>>From that moment until the beginning of April 14, periods of active
>>conditions
> were alternated with (less frequent) minor storm intervals. In the
> beginning of this
> geomagnetic active period, the Kp reached once the value of 6.
> ---------------------------------------------------------------------------
> DAILY INDICES
> DATE RC 10CM Ak BKG M X
> 2005 Apr 11 024 88 011 A9.2 0 0
> 2005 Apr 12 045 85 028 A6.9 0 0
> 2005 Apr 13 046 84 032 A4.6 0 0
> 2005 Apr 14 061 85 016 A5.4 0 0
> 2005 Apr 15 062 85 015 A5.3 0 0
> 2005 Apr 16 045 83 007 A5.5 0 0
> 2005 Apr 17 042 84 004 A5.5 0 0
> # RC : Sunspot index from Catania Observatory (Italy)
> # 10cm: 10.7 cm radioflux (DRAO, Canada)
> # Ak : Ak Index Wingst (Germany)
> # BKG : Background GOES X-ray level (NOAA, USA)
> # M,X : Number of X-ray flares in M and X class, see below (NOAA, USA)
> ---------------------------------------------------------------------------
> NOTICEABLE EVENTS
> DAY BEGIN MAX END LOC XRAY OP TENCM TYPE Cat
> NOAA NOTE
>
>
> #--------------------------------------------------------------------#
> # Solar Influences Data analysis Center - RWC Belgium #
> # Royal Observatory of Belgium #
> # Fax : 32 (0) 2 373 0 224 #
> # Tel.: 32 (0) 2 373 0 491 #
> # #
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> #--------------------------------------------------------------------#
73 & GUD DX,
Thomas F. Giella, KN4LF
Retired Space & Atmospheric Weather Forecaster
Plant City, FL, USA
Grid Square EL87WX
Lat & Long 27 58 33.6397 N 82 09 52.4052 W
kn4lf@arrl.net
Contesting Propagation eReflector:
http://lists.contesting.com/mailman/listinfo/propagation
HC-DX Propagation Channel:
http://www.hard-core-dx.com/index.php?topic=Propagation
KN4LF Daily Solar Space Weather & Geomagnetic Data Archive:
http://www.kn4lf.com/kn4lf5.htm
KN4LF Daily LF/MF/HF Radio Propagation Outlook:
http://www.kn4lf.com/kn4lf6.htm
KN4LF HF/MF Radio Propagation Theory Notes: http://www.kn4lf.com/kn4lf8.htm
KN4LF Amateur & SWL Radio History: http://www.kn4lf.com/index.htm
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