:Issued: 2012 Apr 28 1243 UTC
:Product: documentation at http://www.sidc.be/products/meu
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# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC     #
# (RWC Belgium)                                                      #
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SIDC URSIGRAM 20428
SIDC SOLAR BULLETIN 28 Apr 2012, 1230UT
SIDC FORECAST (valid from 1230UT, 28 Apr 2012 until 30 Apr 2012)
SOLAR FLARES  : Eruptive (C-class flares expected, probability >= 50%)
GEOMAGNETISM  : Quiet (A<20 and K<4)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 28 Apr 2012  10CM FLUX: 118 / AP: 007
PREDICTIONS FOR 29 Apr 2012  10CM FLUX: 115 / AP: 007
PREDICTIONS FOR 30 Apr 2012  10CM FLUX: 110 / AP: 017
COMMENT: Solar activity has increased slightly as 7 low C-class flares
were observed in the last 24h. More C-class flares can be expected,
especially from NOAA AR 1469 (Cat 15 and 16), and there is a slight
chance for another M-class event. CACtus detected a halo CME on April 27
at 16:12 based on SOHO/LASCO images. STEREO/COR2 data have shown this
was a back-sided event. Another CME was visible in the SOHO/LASCO data
starting from 19:00 UT on April 27. As it was very slow (<200 km/s) and
directed towards the north-east, we do not expect this CME to become
geo-effective. A filament eruption was observed on April 28 in
SDO/AIA304 images at 10:45 UT in the south-west quadrant. No coronograh
data is available at this moment to assess this event.
Geomagnetic conditions remain quiet. Unsettled conditions are possible
on April 30 due to coronal hole wind stream effects.




TODAY'S ESTIMATED ISN  : 072, BASED ON 12 STATIONS.

SOLAR INDICES FOR 27 Apr 2012
WOLF NUMBER CATANIA    : 123
10CM SOLAR FLUX        : 118
AK CHAMBON LA FORET    : 011
AK WINGST              : 008
ESTIMATED AP           : 008
ESTIMATED ISN          : 072, BASED ON 18 STATIONS.

NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX  END  LOC    XRAY OP  10CM RADIO BURST TYPES     Catania NOAA NOTE
NONE
END
BT
 
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