Viewing archive of Thursday, 30 April 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Apr 30 1230 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
30 Apr 2015	106	017
01 May 2015	110	008
02 May 2015	114	008

Bulletin

The solar disk currently is almost spotless. One single C1.0 flare occurred at the southwest limb. A faint CME was visible, with first measurement in SOHO/LASCO-C2 at 2:24 UT on April 30, related to backside activity and propagating north. There is some chance (40%) for further C-class flares. Solar wind observations indicate the arrival of a flow related to a positive polarity coronal hole. Around 4:00 UT on April 30, temperature and solar wind speed increased (currently at 370 km/s), while the magnitude of the Interplanetary Magnetic Field (IMF) became more variable and increased to 12 nT. The south component of the IMF is fluctuating between -6 and +8nT. Quiet to unsettled (local K=0 to 3 at Dourbes) geomagnetic conditions were observed. Mainly quiet geomagnetic conditions are expected, with some chance for a few time slots of active (K=4) to minor storm (K=5) conditions within the next 24 hours. Another flow emanating from the extension of a negative polarity northern coronal hole could arrive on May 2.

Today's estimated international sunspot number (ISN): 011, based on 23 stations.

Solar indices for 29 Apr 2015

Wolf number Catania	036
10cm solar flux	104
AK Chambon La Forêt	011
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	020 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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