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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2016 May 05 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
05 May 2016	090	006
06 May 2016	091	018
07 May 2016	089	007

Bulletin

The C1.7 flare which peaked at 22:48 UT on May 04, was the stronger flare, out of the two C-class flares reported during last 24 hours. The flare originated from the Catania sunspot group 73 (NOAA AR 2542), at that moment situated close to the East solar limb. One, out of five sunspot groups visible on the solar disc, has alpha configuration of its photospheric magnetic field, and four have beta configuration. We expect C-class flares in the next 24 hours. The only significant CME observed during last 24 hours was associated with the C1.3 flare from the Catania sunspot group 63 (NOAA AR 2535), and had angular width of about 90 degrees. This CME will not arrive at the Earth.

The solar wind speed is currently 380 km/s, and the interplanetary magnetic field magnitude is about 5 nT. The fast solar wind, associated with the small equatorial coronal hole which reached central meridian in the morning of May 03, can be expected at the Earth on May 06. The arrival of the fast flow might induce active to geomagnetic storm conditions. The geomagnetic conditions are presently quiet and we expect them to remain so in the coming hours.

Today's estimated international sunspot number (ISN): 058, based on 27 stations.

Solar indices for 04 May 2016

Wolf number Catania	086
10cm solar flux	090
AK Chambon La Forêt	///
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	070 - Based on 33 stations

Noticeable events summary

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

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