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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Sep 29 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
29 Sep 2017	093	015
30 Sep 2017	093	012
01 Oct 2017	092	007

Bulletin

Over the past 24 hours solar activity has been low. No significant flares have been recorded. Catania group 55 (NOAA AR region 2681) has been most active, producing one B2.9 flare peaking at 14:34 UT yesterday (29-Sep-2017). No Earth directed Coronal Mass Ejections (CMEs) have been detected in coronograph observations. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain low over the next 24 hours with some probability of C-class flares. The Earth is still inside the fast solar wind stream with the speed of about 640 km/s. However the magnitude of the interplanetary magnetic field remained below 5 nT over the past 24 hours, while Bz component varied between -4 and 4.4 nT. Geomagnetic conditions were active yesterday afternoon (Kp = 4 at 12-21 UT; 28 Sep-2017). Later, after a single episode of minor storm (Kp = 5 at 21-24 UT; 28-Sep-2017) geomagnetic conditions became unsettled (29-Sep-2017) with Kp (NOAA) and local K (Dourbes) indexes ranging between 1-3 and 2-3 respectively. The geomagnetic conditions are expected to remain from unsettled to active (Kp = 4) at least until 01-Oct-2017.

Today's estimated international sunspot number (ISN): 046, based on 20 stations.

Solar indices for 28 Sep 2017

Wolf number Catania	059
10cm solar flux	091
AK Chambon La Forêt	037
AK Wingst	040
Estimated Ap	044
Estimated international sunspot number	047 - Based on 31 stations

Noticeable events summary

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

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