> :Issued: 2005 Apr 11 1649 UTC
> :Product: documentation at http://sidc.oma.be/products/bul
> #--------------------------------------------------------------------#
> # SIDC Weekly bulletin on Solar and Geomagnetic activity #
> #--------------------------------------------------------------------#
> WEEK 223 from 2005 Apr 04
>
> SOLAR ACTIVITY
> --------------
>
> In the beginning of the week the most of solar activity was produced by
> the NOAA AR 0747, Catania sunspot group 49. It produced 3 C-flares on
> April 5 and 6, the strongest one being the C1.6 flare on April 6. On April
> 9 a new active region (NOAA AR 0751, Catania number 52) has quickly
> emerged and started to grow rapidly. It produced several strong B-flares,
> including two B8.2 flares on April 9 and 10.
>
> Two large low-latitude coronal holes were observed in the northern
> hemisphere. On April 4 the first of them was already approaching the
> western limb. The western edge of the second coronal hole reached the
> central meridian on April 8.
>
> GEOMAGNETIC ACTIVITY
> --------------------
>
> On April 4 the interaction region between the fast flow from the first
> low-latitude coronal hole in the northern hemisphere and slower solar wind
> stream has arrived. It contained predominantly southward interplanetary
> magnetic field and thus produced a minor geomagnetic storm. The Kp index
> from Dourbes reached 5 on April 4, IZMIRAN gives the maximal value of 6
> (on April 4) and NOAA SEC - 7 (early on April 5). Until April 7 the Earth
> was situated inside this fast flow. However, the interplanetary magnetic
> field was quite weak (less than 5 nT) and oscillated around zero. The
> disturbed geomagnetic conditions were thus finished on April 6. The
> magnetic field remained weak during the following period of the slow wind
> flow. The rest of the week was thus quiet as the fast flow from the second
> coronal hole did not arrive yet.
>
> ---------------------------------------------------------------------------
> DAILY INDICES
> DATE RC 10CM Ak BKG M X
> 2005 Apr 04 /// 85 /// A6.6 0 0
> 2005 Apr 05 /// 88 /// A7.1 0 0
> 2005 Apr 06 /// 88 /// A7.8 0 0
> 2005 Apr 07 045 88 /// A6.9 0 0
> 2005 Apr 08 053 88 /// A6.1 0 0
> 2005 Apr 09 046 88 /// A8.5 0 0
> 2005 Apr 10 /// 88 /// B1.0 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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