Viewing archive of Thursday, 18 April 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Apr 18 1152 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
18 Apr 2013	105	003
19 Apr 2013	103	009
20 Apr 2013	100	011

Bulletin

Majority of the flaring activity during past 24 hours was of the low C-class level and originated from the Catania sunspot group 43 (NOAA AR 1719) which just turned behind the west solar limb. The strongest flare reported was C1.6 flare peaking at 08:19 UT today. The long duration C3.5 flare peaking at 21:32 UT on April 16 was associated with narrow CME which will not arrive at the Earth. The solar wind speed decreased to rather low value of about 280 km/s. The interplanetary magnetic field magnitude is stable and amounts about 3 nT . The fast flow from the small low-latitude coronal hole in the northern hemisphere which passed the central meridian on April 16 might arrive at the Earth late on April 19 or early on April 20. Although the arrival of the fast stream is possible it is not very probable, and we do not expect disturbed geomagnetic conditions due to its arrival. We expect quiet geomagnetic conditions in the next 48 hours.

Today's estimated international sunspot number (ISN): 060, based on 14 stations.

Solar indices for 17 Apr 2013

Wolf number Catania	112
10cm solar flux	108
AK Chambon La Forêt	005
AK Wingst	003
Estimated Ap	002
Estimated international sunspot number	067 - Based on 22 stations

Noticeable events summary

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

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