Viewing archive of Thursday, 7 September 2023

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2023 Sep 07 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
07 Sep 2023	147	007
08 Sep 2023	150	007
09 Sep 2023	150	007

Solar Active Regions and flaring

There are presently eight numbered active regions observed at the visible side of the solar disc and four of them have beta configuration of the photospheric magnetic field. Solar flaring activity was during last 24 hours at the C-class level. Catania sunspot group 44 (NOAA AR 3423) has, during last 24 hours, strongly increased in the area, sunspot number and complexity of its photospheric magnetic field. Similar behavior was observed for Catania sunspot group 41 (NOAA AR 3421). We expect these two active regions to be source of majority of the flaring activity in the coming hours. We expect C-class but also an isolated M-class flares.

Coronal mass ejections

During last 24 hours there were no Earth directed CMEs detected in the available coronagraph data.

Solar wind

Earth is presently inside the slow solar wind with velocity of about 380 km/s. The interplanetary magnetic field magnitude is about 5 nT.

Geomagnetism

During last 24 hours the geomagnetic conditions were quiet to unsettled, and we expect them to stay so in the comming hours. The solar wind, originating from the negative polarity coronal hole which crossed central meridian on September 03, can be expected at Earth later today.

Proton flux levels

The greater than 10 MeV proton flux was at the background levels and we do not expect significant change in the coming hours. As the complex Catania sunspot group 41 (NOAA AR 3421) is approaching to the West solar limb, the strong flaring activity from this region in the coming days, could be associated with the particle event.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux has continue to fluctuate around the 1000 pfu threshold. The 24h electron fluence is at normal level. We do not expect significant change in these parameters in the coming hours.

Today's estimated international sunspot number (ISN): 138, based on 18 stations.

Solar indices for 06 Sep 2023

Wolf number Catania	178
10cm solar flux	147
AK Chambon La Forêt	011
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	133 - Based on 29 stations

Noticeable events summary

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

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