Viewing archive of Saturday, 6 April 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Apr 06 1209 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
06 Apr 2013	137	005
07 Apr 2013	138	010
08 Apr 2013	141	007

Bulletin

Solar activity has been active during the past 24 hours, with an M2.2 flare and two C flares. The M flare peaked at 17:48 UT on April 5, and was produced by new NOAA AR 11719 on the East limb. More C flares are expected within the next 48 hours, with a good chance for an M flare, especially from NOAA AR 11719 and 11718. Solar wind speed as measured by ACE has been steadily increasing from about 260 km/s in the second part of April 5 till about 360 km/s around 12h UT on April 6. This could be due to the arrival of an expected coronal hole high speed stream. A further increase of the solar wind speed is possible on April 6. Geomagnetic activity was at quiet levels (NOAA Kp between 1 and 2) during the past 24 hours. Quiet (K Dourbes < 4) conditions are predicted for April 6 to 8 with a slight chance for active periods due to the possible arrival of a coronal hole high speed stream.

Today's estimated international sunspot number (ISN): 074, based on 08 stations.

Solar indices for 5 Apr 2013

Wolf number Catania	116
10cm solar flux	134
AK Chambon La Forêt	008
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	082 - Based on 11 stations

Noticeable events summary

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

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