July 31, 2011
Daily Bulletin on Solar and Geomagnetic Activity from the SDIC
Issued: 2011 Jul 31 1250 UTC
roduct: documentation at http://www.sidc.be/products/meu
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# DAILY BULLETIN ON SOLAR AND GEOMAGNETIC ACTIVITY from the SIDC #
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SIDC URSIGRAM 10731
SIDC SOLAR BULLETIN 31 Jul 2011, 1238UT
SIDC FORECAST (valid from 1230UT, 31 Jul 2011 until 02 Aug 2011)
SOLAR FLARES : Eruptive (C-class flares expected, probability >= 50%)
GEOMAGNETISM : Quiet (A<20 and K<4)
SOLAR PROTONS : Quiet
PREDICTIONS FOR 31 Jul 2011 10CM FLUX: 113 / AP: 007
PREDICTIONS FOR 01 Aug 2011 10CM FLUX: 114 / AP: 007
PREDICTIONS FOR 02 Aug 2011 10CM FLUX: 115 / AP: 007
COMMENT: NOAA AR 1261 (Catania 44) is now showing a beta-gamma-delta
configuration and has potential for major flares. In the last 24 hours
the largest one was a C3.8 flare peaking at 02:54 UT (from AR 1261). ARs
1260 and 1263 remain capable of producing M class flares. Several narrow
CMEs were seen leaving the Sun during late 30th and early 31st of July,
most probably without any influence on the Earth. There was some
geomagnetic activity in the night of July 30, with a period of minor
storm levels. This occurred as a consequence of the arrival of a fast
speed stream from a coronal hole. Conditions are quieter now, but more
active periods could occur today and tomorrow.
TODAY’S ESTIMATED ISN : 063, BASED ON 11 STATIONS.
SOLAR INDICES FOR 30 Jul 2011
WOLF NUMBER CATANIA : ///
10CM SOLAR FLUX : 113
AK CHAMBON LA FORET : 023
AK WINGST : 018
ESTIMATED AP : 016
ESTIMATED ISN : 063, BASED ON 16 STATIONS.
NOTICEABLE EVENTS SUMMARY
DAY BEGIN MAX END LOC XRAY OP 10CM RADIO BURST TYPES Catania NOAA NOTE
NONE
END
BT
