Viewing archive of Wednesday, 13 March 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Mar 13 1147 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 Mar 2013	125	003
14 Mar 2013	127	004
15 Mar 2013	129	015

Bulletin

Solar activity has been eruptive featuring several C-flares where two long duration flares where accompanied by CME's. Solar activity is expected to remain eruptive for the next 24 hours. The first CME was detected by SOHO on March 12th 11:00 UT and originated from AR NOAA 1690 with a long duration C2.0 flare at 10:17 UT. This halo CME with an angular width around 170 degrees might give Earth a glancing blow as seen in STEREO A & B. traveling at an estimated speed of 537 km/s it would reach Earth on Friday March 15th 21:00 UT. A second eruption took place after a long duration flare in AR NOAA 1692, but at the time of writing there is insufficient data available to provide more details. Solar wind speed is at a slow 315 km/s and the interplanetary magnetic field Bz component has near zero values. Geomagnetic activity was quiet to moderate and is expected to remain so for the next 48 hours after which it might reach storm conditions due to the CME of March 12th 11:00 UT.

Today's estimated international sunspot number (ISN): 080, based on 09 stations.

Solar indices for 12 Mar 2013

Wolf number Catania	156
10cm solar flux	123
AK Chambon La Forêt	///
AK Wingst	008
Estimated Ap	006
Estimated international sunspot number	076 - Based on 18 stations

Noticeable events summary

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

All times in UTC

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