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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2013 May 20 1201 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
20 May 2013	135	011
21 May 2013	133	007
22 May 2013	133	007

Bulletin

Solar activity was eruptive with 7 C flares mostly originating from NOAA 1750 (Catania 78) and 1 M1.7 flare from an active region just behind the east limb peaking on May 20th 05:25 UT. There is insufficient data available to determine an associated CME, but chances for arrival on Earth are very low due to its location. Because the active region 1750 on the West limb can still produce M flares, there is a possibility for a proton event. A shock corresponding to the CME of May 17th arrived to the Earth at 22:23 UT on May 19 causing active geomagnetic conditions (K Dourbes = 4). Geomagnetic conditions are currently quiet again and are expected to remain so for the next 48 hours.

Today's estimated international sunspot number (ISN): 077, based on 08 stations.

Solar indices for 19 May 2013

Wolf number Catania	///
10cm solar flux	135
AK Chambon La Forêt	018
AK Wingst	014
Estimated Ap	014
Estimated international sunspot number	087 - Based on 20 stations

Noticeable events summary

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

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