Viewing archive of Tuesday, 22 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 22 1238 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
22 Apr 2014	154	006
23 Apr 2014	149	005
24 Apr 2014	144	005

Bulletin

Eleven C-class flares were observed, with 6 produced by NOAA 2035 and the other 5 by NOAA 2038. NOAA 2035 produced the strongest flare at the end of the period (C8 peaking at 11:37UT). The strongest flare from NOAA 2038 was a C5 flare peaking at 20:02UT (21 April). Together with NOAA 2045, these active regions have increased somewhat in sunspot area and magnetic complexity. The other sunspot regions are stable and/or rounding the west limb. Based on the currently available SOHO and STEREO coronagraphic imagery, no earth-directed CMEs have been observed. Further C-class flaring is expected, with a chance on an isolated M-flare. Solar wind speed declined further from around 600 to 450km/s. Bz was mostly positive, with values up to +5nT. Geomagnetic conditions evolved from active to quiet. Geomagnetic conditions are expected to remain mostly quiet.

Today's estimated international sunspot number (ISN): 102, based on 14 stations.

Solar indices for 21 Apr 2014

Wolf number Catania	///
10cm solar flux	159
AK Chambon La Forêt	019
AK Wingst	014
Estimated Ap	018
Estimated international sunspot number	112 - Based on 23 stations

Noticeable events summary

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

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