Viewing archive of Saturday, 21 April 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Apr 21 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Solar protons

Quiet

	10cm flux	Ap
21 Apr 2018	073	018
22 Apr 2018	073	010
23 Apr 2018	072	006

Bulletin

Solar flaring activity is rather low. Catania sunspot group 78 (NOAA AR 2706) was source of several B-class flares during last 24 hours. As Catania sunspot group 78 continues to have beta configuration of its photospheric magnetic field, we might expect B-class flares and possibly also isolated C-class flares in the coming hours. No Earth directed CMEs were observed in the coronagraph images. The solar protons continue to be at the background level.

Earth is presently inside the fast solar wind (speed of about 610 km/s) associated with the equatorial coronal hole. The interplanetary magnetic field magnitude is about 6nT. As the solar wind speed is rather high, together with the longer intervals of the Bz component of the IMF it might induce disturbed geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 026, based on 24 stations.

Solar indices for 20 Apr 2018

Wolf number Catania	015
10cm solar flux	073
AK Chambon La Forêt	044
AK Wingst	040
Estimated Ap	041
Estimated international sunspot number	016 - Based on 36 stations

Noticeable events summary

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

All times in UTC

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