Viewing archive of Tuesday, 7 April 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Apr 07 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
07 Apr 2015	120	009
08 Apr 2015	120	018
09 Apr 2015	120	017

Bulletin

The Sun released one C3.0 flare during the past 24 hours. It was produced by NOAA AR 2320, peaked at 19:06 UT on April 6 and was associated to a dimming, an EUV wave, a surge, a CME and a Type II radio burst. The CME was first observed by LASCO C2 at 19:24 UT and had an angular extent of about 140 degrees. The plane-of-sky speed derived by CACTUS was 339 km/s, while the Type II burst corresponds to a speed of 691 km/s. This CME may deliver a glancing blow in the second half of April 9. In the next 24 hours, more C flaring is expected, with a slight chance for an M flare, especially from AR 2320 and 2318. Solar wind speed gradually decreased from about 480 to 400 km/s over the past 24 hours, while the Interplanetary Magnetic Field magnitude varied between 1 and 5 nT. Over the past 24 hours, geomagnetic conditions have been quiet (K Dourbes between 0 and 3; NOAA Kp between 1 and 2). There is a chance for active geomagnetic levels (K Dourbes = 4) late on April 7 and on April 8, due to a possible glancing blow of the CME of April 4. Quiet conditions with active intervals are possible in the second half of April 9, as a result of a glancing blow from the CME of April 6.

Today's estimated international sunspot number (ISN): 040, based on 18 stations.

Solar indices for 06 Apr 2015

Wolf number Catania	///
10cm solar flux	126
AK Chambon La Forêt	010
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	039 - Based on 19 stations

Noticeable events summary

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

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