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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2018 Apr 11 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
11 Apr 2018	069	015
12 Apr 2018	068	008
13 Apr 2018	069	003

Bulletin

The solar activity has been quiet over the past 24 hours. The visible solar disc is spotless and no flare has been recorded. Quiet flaring conditions are expected for the next 24-hour period.

No Earth directed Coronal Mass Ejection has been observed. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.

The Earth is currently into the fast solar wind speed associated with the equatorial coronal hole (which has crossed the central meridian on April 05). The solar wind speed has increased from around 560 to 610 km/s over the past 24 hours. The total magnetic field strength ranged between 4 and 6.5 nT. The Bz component was ranging between -5.7 and +4 nT being many negative. The enhanced solar wind conditions are expected to persist for the next 24-hour period and until the influence of the HSS associated with the coronal hole decay.

Geomagnetic conditions have been active over the past 24 hours. An isolate minor storm with Kp index 5 (NOAA) was observed at 00:00 UT on April 11 due to Bz component being negative for a prolonged period. The local K index 4 (Dourbes) was observed about the same time. Due to the ongoing enhancement of the solar wind, unsettled to active geomagnetic conditions are expected. Isolated minor geomagnetic storms cannot be excluded, especially if Bz component remains negative for a long period of time.

Today's estimated international sunspot number (ISN): 000, based on 18 stations.

Solar indices for 10 Apr 2018

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	029
AK Wingst	017
Estimated Ap	018
Estimated international sunspot number	007 - Based on 30 stations

Noticeable events summary

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

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