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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 01 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
01 Oct 2017	089	013
02 Oct 2017	089	011
03 Oct 2017	088	008

Bulletin

Over the past 24 hours solar activity has been low. No significant flares have been recorded. Catania group 56 / NOAA AR region 2682 (McIntosh: Cso; Mag.Type: Beta) has been most active, producing one B3.5 flare peaking at 17:11 UT yesterday (30-Sep-2017). No Earth directed Coronal Mass Ejections (CMEs) have been detected in coronograph observations. Integral proton flux for protons with energies above 10 MeV remained at background level over the past 24 hours. Solar activity is expected to remain low over the next 24 hours with some probability of C-class flares. Solar wind speed continues overall decline from about 540 km/s to 490 km/s, reflecting declining influence from the high speed stream from the positive polarity coronal hole. The interplanetary magnetic field magnitude returned to its nominal 4-5 nT range with the Bz component fluctuating between -4.5 and 4.5 nT. The solar wind is expected to further recover to background conditions over the next days. Geomagnetic conditions were quiet to active (local K Dourbes 1-4, NOAA Kp 2-4) and are expected to remain quiet to unsettled over the next days. Isolated periods of active conditions are possible.

Today's estimated international sunspot number (ISN): 038, based on 08 stations.

Solar indices for 30 Sep 2017

Wolf number Catania	///
10cm solar flux	089
AK Chambon La Forêt	026
AK Wingst	018
Estimated Ap	017
Estimated international sunspot number	/// - Based on /// stations

Noticeable events summary

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

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