Viewing archive of Friday, 11 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 11 1240 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
11 Apr 2014	145	010
12 Apr 2014	155	016
13 Apr 2014	160	008

Bulletin

Solar activity has risen significantly during the past 24 hours and seven C-class flares were produced. Most of the flares were originating from the East limb near 15 degrees south. At that latitude, several regions are turning onto the visible side of the solar disk, including Catania sunspot region 24 (NOAA AR 2035). The strongest flare was a C9.4 flare peaking at 11:24 UT on April 11 from sunspot region 24. Further analysis will be needed to determine whether other solar phenomena were associated with this event. The slow partial halo CME with first measurement in LASCO at 0h48 UT of April 10, at most a shock can be expected to arrive. More C-class flares are expected from the active regions that are currently rotating around the East limb. M-class flares are also likely during the next 48 hours. An X-class flare is not excluded, but is not likely. Interplanetary magnetic field measured by ACE currently is variable with a magnitude ranging from 0 to 9 nT and a Bz fluctuating between -5 and +5 nT. Bz is currently negative, resulting in unsettled local geomagnetic conditions (local K=3 at Dourbes). Solar wind speed is around 380 km/s. Magnetic conditions are expected to be quiet to unsettled. At the arrival of the CH high speed stream (from April 12 on) active conditions might be observed.

Today's estimated international sunspot number (ISN): 047, based on 16 stations.

Solar indices for 10 Apr 2014

Wolf number Catania	088
10cm solar flux	137
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	044 - Based on 24 stations

Noticeable events summary

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

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