Viewing archive of Tuesday, 12 April 2016

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2016 Apr 12 1242 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
12 Apr 2016	117	014
13 Apr 2016	119	027
14 Apr 2016	121	025

Bulletin

Four C flares were released by NOAA AR 2529 in the past 24 hours. The brightest one was a C1.8 flare which peaked at 07:51 UT on April 12. More C flares (probability 75%) are expected in the next 24 hours, with a slight chance (probability 10%) for an M flare, especially from AR 2529. CACTUS detected a partial halo CME at 03:24 on April 12. Close inspection of EUVI A imagery revealed that this CME was associated to a backside event, and will not be geoeffective. Solar wind speed varied between about 340 and 470 km/s in the past 24 hours, while the magnitude of the Interplanetary Magnetic Field ranged between 1 and 12 nT. Over the past 24 hours, geomagnetic conditions have been quiet to unsettled (K Dourbes between 1 and 3; NOAA Kp between 1 and 3). Quiet to unsettled geomagnetic levels (K Dourbes < 4) are expected on most of April 12. Late on April 12, and on April 13 and 14, the expected arrival of a high speed stream associated with a negative equatorial coronal hole may cause active (K Dourbes = 4) to moderate storm (K Dourbes = 6) conditions.

Today's estimated international sunspot number (ISN): 038, based on 26 stations.

Solar indices for 11 Apr 2016

Wolf number Catania	044
10cm solar flux	117
AK Chambon La Forêt	011
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	042 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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