Viewing archive of Tuesday, 17 April 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Apr 17 1230 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
17 Apr 2018	069	006
18 Apr 2018	069	006
19 Apr 2018	068	009

Bulletin

During last 24 hours three active regions emerged on the visible side of the Sun, but two of them already decayed. There are presently two numbered active regions observed, NOAA ARs 2704 and 2705, and both of them are spotless. The flaring activity is low and there were no C-class or even B-class flares reported. We expect such a low activity to persist in the coming hours. No Earth directed CMEs were observed in the coronagraph images, and the solar protons remained at the background level.

The Earth is still inside the slow solar wind with the speed of about 290 km/s and the interplanetary magnetic field magnitude is 3 nT. The increase of the solar wind speed, associated with equatorial coronal hole which reached central meridian on April 16 might be expected on April 19.The geomagnetic conditions are presently quiet and we expect them to stay so in the coming hours.

Today's estimated international sunspot number (ISN): 011, based on 20 stations.

Solar indices for 16 Apr 2018

Wolf number Catania	012
10cm solar flux	069
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	007 - Based on 32 stations

Noticeable events summary

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

All times in UTC

<< Go to daily overview page