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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Sep 19 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
19 Sep 2018	068	008
20 Sep 2018	068	006
21 Sep 2018	068	007

Bulletin

The solar activity is low, and there were no flares reported during last 24 hours. New sunspot group was reported by Catania today, numbered as Catania sunspot group 96. However, as this sunspot group is presently very simple, the probability for the C-class flares in the coming hours remains to be low (less than 5 percent). The coronagraph images from last 24 hours do not show signatures of the possibly Earth directed CME. The solar protons remain to be at the background level.

The solar wind speed continues to decrease and it presently amounts about 440 km/s, while the interplanetary magnetic field magnitude stays to be around 4 nT. The equatorial coronal hole has reached the central meridian this morning, and the associated fast solar wind might reach the Earth on September 22. The geomagnetic conditions were quiet and we expect they will stay so in the coming hours.

Today's estimated international sunspot number (ISN): 000, based on 24 stations.

Solar indices for 18 Sep 2018

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	010
AK Wingst	006
Estimated Ap	006
Estimated international sunspot number	000 - Based on 35 stations

Noticeable events summary

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

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