Viewing archive of Sunday, 21 July 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Jul 21 1350 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
21 Jul 2013	115	010
22 Jul 2013	116	010
23 Jul 2013	115	007

Bulletin

Solar activity is still low with only three C-class flares reported during last 24 hours. Majority of the flares originated from the NOAA AR 1800 which has at the moment beta configuration of the photosperic magnetic field. The strongest flare was C3.1 flare which peaked at 08:44 UT on July 21. The flare was associated with the coronal dimming and therefore probably also with the CME. However, this cannot be confirmed due to the data gap in STEREO and SOHO/LASCO observations. We expect C-class flares and also possibly M-class flares. The solar wind speed is currently 400 km/s, and the interplanetary magnetic field magnitude is about 3 nT. We expect quiet to unsettled geomagnetic conditions.

Today's estimated international sunspot number (ISN): 034, based on 13 stations.

Solar indices for 20 Jul 2013

Wolf number Catania	///
10cm solar flux	113
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	005
Estimated international sunspot number	038 - Based on 16 stations

Noticeable events summary

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

All times in UTC

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