Viewing archive of Saturday, 26 January 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Jan 26 1253 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
26 Jan 2013	099	013
27 Jan 2013	097	017
28 Jan 2013	099	005

Bulletin

Catania sunspot groups 70 and 72 (NOAA ARs 1660 and 1661 respectively), as well as yet unnumbered sunspot group that emerged close to the east limb yesterday evening, have a potential to produce a C-class flare. Three flares stronger than B5 were produced in Catania sunspot groups 70 and 72 during the last 24 hours. A C-class flare is therefore possible. The Earth is currently inside a fast (around 500 km/s) solar wind flow with elevated (around 10 nT) interplanetary magnetic field magnitude. Active geomagnetic conditions (K = 4) were reported by NOAA and IZMIRAN, and unsettled conditions (K = 3) were reported by Dourbes. More intervals of active geomagnetic conditions are possible, especially after the arrival of the ICME-driven shock that is expected late today - early tomorrow.

Today's estimated international sunspot number (ISN): 042, based on 07 stations.

Solar indices for 25 Jan 2013

Wolf number Catania	///
10cm solar flux	101
AK Chambon La Forêt	020
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	032 - Based on 13 stations

Noticeable events summary

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

All times in UTC

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