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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Mar 25 1236 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
25 Mar 2015	135	008
26 Mar 2015	137	007
27 Mar 2015	139	010

Bulletin

The strongest, out of six C-class flares reported in the last 24 hours, was the C8.7 flare which peaked at 04:46 UT this morning. This long duration flare originating from the Catania sunspot group 13 (NOAA AR 2305) was accompanied by coronal dimming and a post-eruption arcade observed by SDO/AIA. We expect C-class flares and possibly also an isolated M-class flare, in particular from the Catania sunspot group 13 (NOAA AR 2305) which is still growing and currently has beta-gamma-delta configuration of its photospheric magnetic field. The full halo CME first seen in the SOHO LASCO C2 field of view at 08:24 UT on March 24 was the back side event, and will therefore not arrive at the Earth. This fast CME, with the projected plane of the sky speed of about 1900 km/s, was possibly associated with the flaring from the NOAA AR 2297 which rotated behind the west solar limb on March 20. The CME was also associated with the gradual increase of the proton >10 MeV fluxes, which started at about 09:00 UT on March 24 had its maximum (0.8 pfu) late on March 24 and it is currently decreasing. The proton level did not reach the event threshold. No Earth directed CMEs were observed during last 24 hours. The Earth is still inside the fast solar wind with the speed of about 550 km/s. The interplanetary magnetic field continues to be stable with the magnitude of about 5nT. The geomagnetic conditions are currently quiet and we expect quiet to unsettled conditions in the following 24 hours.

Today's estimated international sunspot number (ISN): 079, based on 10 stations.

Solar indices for 24 Mar 2015

Wolf number Catania	///
10cm solar flux	133
AK Chambon La Forêt	021
AK Wingst	010
Estimated Ap	011
Estimated international sunspot number	088 - Based on 21 stations

Noticeable events summary

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

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