Viewing archive of Wednesday, 9 September 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 Sep 09 1233 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Solar protons

Quiet

	10cm flux	Ap
09 Sep 2015	083	028
10 Sep 2015	082	013
11 Sep 2015	080	022

Bulletin

Solar activity remains at the low level with only B-class flares reported within last 24 hours. We expect this low solar activity to persist with possibility of only an isolated C-class flare in the coming hours. No Earth directed CMEs were observed in the last 24 hours. The arrival of the ICME (at about 12 UT on September 07) induced intervals of active to geomagnetic storm conditions during last 24 hours. Since 23:50 UT on September 08, the Bz component of the interplanetary magnetic field has constantly negative value of about -10 nT. The solar wind speed is slowly decreasing and its current value is about 410 km/s. The long interval of the negative value of the Bz component and at that moment still high solar wind speed (about 440 km/s) induced geomagnetic storm conditions early this morning, NOAA reported Kp=6 and local station Dourbes reported K=5. Yesterday morning (September 08), elongated equatorial coronal hole (from 20S to 20N) crossed central meridian. The associated fast flow is expected to arrive late on September 10 or in the morning of September 11. This morning the low latitude extension of the northern polar coronal hole crossed the central meridian. The associated fast flow is expected late on September 11 or in the morning of September 12. We expect active to unsettled conditions in the coming hours.

Today's estimated international sunspot number (ISN): 047, based on 17 stations.

Solar indices for 08 Sep 2015

Wolf number Catania	///
10cm solar flux	084
AK Chambon La Forêt	031
AK Wingst	026
Estimated Ap	025
Estimated international sunspot number	041 - Based on 20 stations

Noticeable events summary

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

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