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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2015 Mar 30 1230 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

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

Sluneční protony

Quiet

	10cm flux	Ap
30 Mar 2015	142	009
31 Mar 2015	139	029
01 Apr 2015	136	013

Bulletin

Four sunspot groups are reported by Catania today. The strongest flare during the last 24 hours was the C4.7 flare peaking at 01:52 UT in the NOAA AR 2303 that just passed behind the north-west solar limb (and therefore does not have a Catania number anymore). We expect flaring activity on the low C-level in the next 48 hours. A partial halo CME was first seen in the SOHO/LASCO C2 field of view at 18:24 UT on March 29. It had the angular width of around 190 degrees and the plane-of-the-sky projected speed of around 700 km/s. SDO/AIA data indicate that this was a far-side event. It will therefore not arrive at the Earth and have no geomagnetic consequences. The Earth is currently inside a slow (around 340 km/s) solar wind flow with average (around 6 nT) interplanetary magnetic field magnitude. The geomagnetic conditions are quiet and are expected to remain so until the arrival of a fast flow from a low-latitude extension of the southern polar coronal hole later today or early tomorrow. Geomagnetic disturbance up to the minor storm level is expected.

Today's estimated international sunspot number (ISN): 043, based on 17 stations.

Solar indices for 29 Mar 2015

Wolf number Catania	///
10cm solar flux	145
AK Chambon La Forêt	013
AK Wingst	012
Estimated Ap	013
Estimated international sunspot number	053 - Based on 12 stations

Noticeable events summary

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

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