> :Issued: 2005 Mar 28 1823 UTC
> :Product: documentation at http://sidc.oma.be/products/bul
> #--------------------------------------------------------------------#
> # SIDC Weekly bulletin on Solar and Geomagnetic activity #
> #--------------------------------------------------------------------#
> WEEK 221 from 2005 Mar 21
>
> SOLAR ACTIVITY
> --------------
> We can really be short about the flaring issue of this week: only 2
> C-flares
> were recorded, one on March 21 and one on March 24. Both these flares were
> generated by sunspot group 44 (NOAA 745).
> The first part of the week, namely on March 21 and 22, we were under the
> influence of a small coronal hole which made the solar wind speed increase
> to 400 km/s. From March 24, a big recurrent coronal hole was on a
> geoeffective
> position and pushed the solar wind speed up to 700 km/s.
>
>
> GEOMAGNETIC ACTIVITY
> --------------------
> The first coronal hole mentioned above, was the cause of only one K_p
> index
> of 4 on March 21. From March 24, ACE shows clearly the influence of the
> big
> (recurrent) coronal hole. B_z went up to -10nT leading to active
> geomagnetic
> conditions on March 25, 26 and shortly on March 27. Boulder estimated a
> planetary K index of 5 on March 25.
> ---------------------------------------------------------------------------
> DAILY INDICES
> DATE RC 10CM Ak BKG M X
> 2005 Mar 21 052 90 /// A6.2 0 0
> 2005 Mar 22 064 87 /// A6.9 0 0
> 2005 Mar 23 055 88 /// A7.5 0 0
> 2005 Mar 24 073 87 /// A5.8 0 0
> 2005 Mar 25 075 82 /// A3.7 0 0
> 2005 Mar 26 066 78 /// A3.1 0 0
> 2005 Mar 27 031 78 /// A3.3 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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