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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 May 13 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Major magstorm expected (A>=50 or K>=6)

Protoni solari

Quiet

	10cm flux	Ap
13 May 2015	160	038
14 May 2015	158	038
15 May 2015	156	018

Bulletin

NOAA 2339 is decaying and produced only low-level C-class flares. NOAA 2342 produced the strongest flare of the period, a C3.5 flare peaking at 05:59UT and located in its trailing portion. The flare was associated with a series Type III radio-burst, and a surge was observed in H-alpha. The greater than 10 MeV proton flux is nearly back at nominal levels. No earth-directed coronal mass ejections (CME) were observed over the period.

Further C-class flaring is expected, with a chance on an M-class flare.

Moderate geomagnetic storming has been observed as the Earth is under the influence of the high speed stream (HSS) of a recurrent coronal hole. Kp reached 6 between 03:00 and 09:00UT, while Dourbes reported a maximum K of 4. Solar wind speed is currently at about 700 km/s, while Bz-values were at -14 nT between 04:00 and 04:30UT.

Further episodes of minor to moderate geomagnetic storming are expected.

Today's estimated international sunspot number (ISN): 121, based on 20 stations.

Solar indices for 12 May 2015

Wolf number Catania	216
10cm solar flux	163
AK Chambon La Forêt	031
AK Wingst	016
Estimated Ap	019
Estimated international sunspot number	115 - Based on 28 stations

Noticeable events summary

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

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