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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2015 Apr 27 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
27 Apr 2015	115	005
28 Apr 2015	112	008
29 Apr 2015	110	012

Bulletin

Flaring activity was limited to one single C1.4 flare, originating from NOAA active region 2331 (Catania sunspot group 37), peaking at 20:57 UT. Flaring at the minor C level is expected over the next few days. A filament extending from N0E20 to N40E70 is currently crossing the solar disk. No Earth directed CMEs were observed. Earth is currently inside a slow solar wind (speed in the range 300-350 km/s). The magnitude of the interplanetary magnetic field (IMF) has slightly increased to 7nT, with currently a negative Bz. The phi angle was mainly positive, but turning to a negative orientation in the past few hours. The flow emanating from a recurrent equatorial coronal hole (currently crossing the central meridian) is expected to arrive within two to three days, which might result in an increased solar wind speed. Quiet to unsettled (local K=0 to 3) geomagnetic conditions were observed and are expected to remain so for the next 48 hours.

Today's estimated international sunspot number (ISN): 037, based on 18 stations.

Solar indices for 26 Apr 2015

Wolf number Catania	///
10cm solar flux	119
AK Chambon La Forêt	007
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	042 - Based on 17 stations

Noticeable events summary

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

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