Viewing archive of Monday, 29 April 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Apr 29 1319 UTC

SIDC Forecast

Solar flares

Eruptive (C-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
29 Apr 2013	137	010
30 Apr 2013	139	001
01 May 2013	140	001

Bulletin

Solar activity was moderate during the last 24 hours, with several C-class flares occurring in NOAA ARs 1731, 1733 and a yet unnumbered AR at S19E79 (Catania 59). These 3 regions are the main candidates for further C class flares in the next 48 hours, with even a risk for an isolated M flare from NOAA ARs 1731 and 1733. Several CMEs occurred in the last 24 hours, one at 1325 UT on April 28, in the vicinity of Cat. AR 59, behind the limb, one at 2112 UT on the same day, related to a C4.4 flare in NOAA AR 1733, and one on April 29 around 0324 UT, linked to a filament eruption in the vicinity of AR 1732. None of these events appear to be geoeffective. We expect geomagnetic activity to remain at quiet levels for the next 48 hours.

Today's estimated international sunspot number (ISN): 094, based on 14 stations.

Solar indices for 28 Apr 2013

Wolf number Catania	149
10cm solar flux	132
AK Chambon La Forêt	014
AK Wingst	009
Estimated Ap	007
Estimated international sunspot number	072 - Based on 18 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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