Viewing archive of Thursday, 21 March 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Mar 21 1158 UTC

SIDC Forecast

Solar flares

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
21 Mar 2013	107	012
22 Mar 2013	107	002
23 Mar 2013	110	001

Bulletin

Solar activity was quiet for the past 24 hours, with only a C1.0 flare from NOAA AR1692. Solar activity is expected to remain quiet with a slight chance for an isolated C-flare. On March 20 UT ACE measured a jump in the interplanetary magnetic field to 11 nT (starting at 12h UT) and in the solar wind speed to 732 km/s, probably due to the arrival of the CME of March 17. The solar wind speed and interplanetary magnetic field are now returning to stable values, with a current speed of 428 km/s and a magnetic field of 6 nT. Geomagnetic conditions in Dourbes reached active levels (K=4) from 0 to 6 UT this morning. Geomagnetic activity is expected to return to quiet levels and remain so for the next 48 hours.

Today's estimated international sunspot number (ISN): 032, based on 13 stations.

Solar indices for 20 Mar 2013

Wolf number Catania	///
10cm solar flux	108
AK Chambon La Forêt	032
AK Wingst	011
Estimated Ap	011
Estimated international sunspot number	036 - Based on 15 stations

Noticeable events summary

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

All times in UTC

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