Viewing archive of Saturday, 28 September 2013

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2013 Sep 28 1447 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
28 Sep 2013	108	006
29 Sep 2013	106	006
30 Sep 2013	106	006

Bulletin

X-ray background radiation is in the B-level. No C-flares occurred. Catania sunspot group 83/NOAA AR 1850 has the potential of producing a C-flare. It is located between 30° and 45° longitude. A large filament (longitudinal, between 5° and 30°) passed the central meridian. Up to now, it seems to be stable. Two coronal holes (CH) are visible on the solar disk: a small northern CH (between 35° and 50° latitude, 20° wide) crossed the central meridian on September 27 and a small equatorial CH (between 5°S and 5°N, 10° wide) that crosses the central meridian today. Unsettled geomagnetic conditions are possible from October 1-2. The geomagnetic conditions are quiet at the moment.

Today's estimated international sunspot number (ISN): 036, based on 15 stations.

Solar indices for 27 Sep 2013

Wolf number Catania	073
10cm solar flux	108
AK Chambon La Forêt	005
AK Wingst	001
Estimated Ap	001
Estimated international sunspot number	044 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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