Viewing archive of Friday, 3 April 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Apr 03 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
03 Apr 2015	121	021
04 Apr 2015	123	021
05 Apr 2015	128	012

Bulletin

The strongest flare of the past 24 hours was the C1.7 flare peaking at 07:26 UT today in the Catania sunspot group 21 (no NOAA number yet) that has just crossed the east limb. More C-class flares are expected in this group, with a small chance for an M-class flare. The solar wind speed is currently around 550 km/s, probably indicating the imminent arrival of a fast stream from the trans-equatorial coronal hole. The interplanetary magnetic field (IMF) is currently around 7 nT. Yesterday evening, in the interaction region between the fast stream and the preceding slow flow, the IMF Bz component stayed negative (down to -10 nT) for around 3 hours, so active geomagnetic conditions (K = 4) were reported by IZMIRAN and NOAA. (Intervals of K = 5 reported this morning by Dourbes are most probably spurious.) We expect active to minor storm conditions in the coming hours as the Earth will be going through the fast solar wind stream.

Today's estimated international sunspot number (ISN): 021, based on 10 stations.

Solar indices for 02 Apr 2015

Wolf number Catania	///
10cm solar flux	121
AK Chambon La Forêt	029
AK Wingst	015
Estimated Ap	017
Estimated international sunspot number	025 - Based on 20 stations

Noticeable events summary

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

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