Viewing archive of Tuesday, 21 May 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 May 21 1230 UTC

SIDC Forecast

Solar flares

Active (M-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
21 May 2013	130	007
22 May 2013	132	007
23 May 2013	135	007

Bulletin

Solar activity was eruptive the last 24 hours with 7 C flares mostly originating from AR NOAA 1748 (Catania 75) which has become more complex again since yesterday. AR NOAA 1750 (Catania 78) is decaying, but still has a possibility to produce M flares and due to its position, also a proton event. A CME was detected by LASCO C2 on May 20th around 13:00 UT with an angle of around 150 degrees and a speed around 340 km/s. It should reach Earth on May 24th around 19:00 UT, but should only have minor impact. It originated from AR 1748 with a C flare around 10:30 UT. Geomagnetic conditions where quiet to moderate and are expected to remain so for the next 48 hours.

Today's estimated international sunspot number (ISN): 076, based on 06 stations.

Solar indices for 20 May 2013

Wolf number Catania	120
10cm solar flux	132
AK Chambon La Forêt	011
AK Wingst	010
Estimated Ap	008
Estimated international sunspot number	074 - Based on 14 stations

Noticeable events summary

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

All times in UTC

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