Viewing archive of Saturday, 13 July 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Jul 13 1209 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
13 Jul 2013	115	017
14 Jul 2013	110	007
15 Jul 2013	100	007

Bulletin

Solar activity was low during the past 24 hours, with only C class flares reported. The strongest event, a C3.5 flare, took place in NOAA AR 1785 on July 12, 1733 UT (peak time). It was accompanied by a very faint CME observed by LASCO C2. Due to the position of the source region, and with the information currently available, this event does not seem to be geoffective. C flares are possible in the next 48 hours, in particular from NOAA AR 1785, 1787 and 1791, and we therefore foresee eruptive conditions. We expect mostly quiet to unsettled conditions for the next 48 hours in terms of geomagnetic activity. ACE observations show that the Earth is currently within a magnetic cloud, probably associated with the halo CME of July 9th. The first hint of its arrival was detected on July 12th, a bit after 1600 UT, with moderate negative excursions of the Bz component of the interplanetary magnetic field.

Today's estimated international sunspot number (ISN): 021, based on 08 stations.

Solar indices for 12 Jul 2013

Wolf number Catania	087
10cm solar flux	118
AK Chambon La Forêt	019
AK Wingst	011
Estimated Ap	010
Estimated international sunspot number	048 - Based on 19 stations

Noticeable events summary

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

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