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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Sep 03 1236 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
03 Sep 2017	097	007
04 Sep 2017	096	006
05 Sep 2017	098	006

Bulletin

Over the past 24 hours solar activity remained low beside the number of regions with potential activity. The Catania group 47 (NOAA region 2674) produced several B and C-class flares. Although Catania group 43 (NOAA region 2672) had already rotated around the west solar limb, it produced the largest flare at 15:41 UT on September 2, which was a C7.7-class flare associated with a CME and a type II burst. The CME is not expected to be geoeffective as it erupted from the west solar limb. We expected a probability of C-class flare with possibly the occurrence of an M-class flare, particularly coming from the Catania group 47 (NOAA region 2674).

No Earth directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph imagery and the solar protons remains at background level.

The Earth remained in the fast solar wind. The speed has slowly decreased from 600 to about 500 Km/s. The interplanetary magnetic field magnitude stabilized around 4 nT, and the Bz component was fluctuating between -5 and 2 nT for the second day being mainly negative. No signature from the glancing glow CME (detected on August 28 at 17:12 UT on LASCO-C2) was observed in the Solar wind data. We expect the solar wind to gradually return to nominal levels by September 4.

The geomagnetic conditions varied between unsettled to quiet conditions with K-Dourbes and Kp-NOAA ranging between 1 and 3. As the solar speed is currently decreasing, we expect the geomagnetic conditions to return to quite condition.

Today's estimated international sunspot number (ISN): 116, based on 19 stations.

Solar indices for 02 Sep 2017

Wolf number Catania	///
10cm solar flux	100
AK Chambon La Forêt	022
AK Wingst	022
Estimated Ap	028
Estimated international sunspot number	062 - Based on 28 stations

Noticeable events summary

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

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