Viewing archive of Friday, 21 September 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Sep 21 1233 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
21 Sep 2018	067	004
22 Sep 2018	067	010
23 Sep 2018	066	010

Bulletin

The level of the solar flaring activity is extremely low, with no reports of C-class and even B-class flares. The last reported flare (B-class or stronger) was B1.0 flare on September 11. We expect such a low lever of activity to persist in the coming hours. During last 24 hours we did not observe signatures of the possibly Earth directed CMEs, and the solar protons remained at the background level.

The Earth is still inside the slow solar wind with the speed of about 330 km/s, and the interplanetary magnetic field magnitude is 3 nT. The geomagnetic conditions are presently quiet and we expect them to stay so in the coming hours. We can expect unsettled geomagnetic conditions late on September 22 due to expected arrival of the fast solar wind.

Today's estimated international sunspot number (ISN): 000, based on 25 stations.

Solar indices for 20 Sep 2018

Wolf number Catania	000
10cm solar flux	067
AK Chambon La Forêt	004
AK Wingst	001
Estimated Ap	002
Estimated international sunspot number	000 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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