Viewing archive of Tuesday, 25 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 25 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
25 Apr 2017	081	014
26 Apr 2017	079	014
27 Apr 2017	078	008

Bulletin

There are three active regions, all with the simple configuration of the photospheric magnetic field, presently observed on the visible side of the solar disc. Solar activity is low with five low B-class and no C-class flares reported during last 24 hours. We do not expect change in the solar activity, and although C-class flares are possible, they are not very probable. No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

The solar wind speed is slowly decreasing and it presently amounts 600 km/s. The interplanetary magnetic field magnitude is about 5nT. Due to the influence of the fast solar wind, several intervals of the active conditions were reported during last 24 hours (Dourbes reported K=4 and NOAA Kp=4). The geomagnetic conditions are presently unsettled to active and we expect them to stay so in the coming hours.

Today's estimated international sunspot number (ISN): 041, based on 20 stations.

Solar indices for 24 Apr 2017

Wolf number Catania	050
10cm solar flux	080
AK Chambon La Forêt	028
AK Wingst	020
Estimated Ap	024
Estimated international sunspot number	046 - Based on 28 stations

Noticeable events summary

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

All times in UTC

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