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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2014 Apr 08 1253 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
08 Apr 2014	140	010
09 Apr 2014	140	011
10 Apr 2014	140	007

Bulletin

Since our last bulletin, three C-class flares were produced. They all originated from Catania sunspot group 8 (NOAA AR 1926). The GOES X-ray flux background was at B-class level. A new region emerged near S03E30. Eruptive flaring activity is expected for the next 48 hours with a slight chance for M-class flares. No Earth bounded CMEs were observed. Solar wind observations from ACE showed an increase of the solar wind speed at 17h UT of April 7 from 360 to 480 km/s and then a decline to 400 km/s. The magnitude of the interplanetary magnetic field varied between 1 and 11 nT, with a Bz component fluctuating between -10 and 6 nT. The periods with a negative Bz resulted in unsettled to active magnetic conditions (both local K at Dourbes and NOAA planetary Kp). So far, there were no clear signatures of arrival of a shock related to the CME of April 4, but it is still possible in the next few hours. Unsettled conditions are expected for the next 48 hours.

Today's estimated international sunspot number (ISN): 085, based on 20 stations.

Solar indices for 07 Apr 2014

Wolf number Catania	131
10cm solar flux	140
AK Chambon La Forêt	014
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	082 - Based on 24 stations

Noticeable events summary

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

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