Viewing archive of Saturday, 26 April 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2014 Apr 26 1225 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
26 Apr 2014	122	005
27 Apr 2014	119	012
28 Apr 2014	117	005

Bulletin

Five low-level C-class flares were observed. They originated from behind the southwest limb (probably NOAA 2035), from sunspot groups NOAA 2038 and NOAA 2045, and from a region which was still behind the northeast limb. No CMEs with an Earth-directed component were observed. There remains a chance on further C-class flares. Solar wind speed declined from about 430 to 360km/s. Bz was weak and mostly negative at -4nT, with brief excursions up to +2nT. The particle stream from a small equatorial coronal hole that passed the central meridian early on 24 April, is expected to arrive at Earth most probably tomorrow. The geomagnetic field has been quiet and expected to remain so. Locally, a brief active interval is possible from the effect of the coronal hole.

Today's estimated international sunspot number (ISN): 034, based on 12 stations.

Solar indices for 25 Apr 2014

Wolf number Catania	///
10cm solar flux	125
AK Chambon La Forêt	011
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	045 - Based on 19 stations

Noticeable events summary

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

All times in UTC

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