Viewing archive of Thursday, 13 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 13 1249 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
13 Apr 2017	069	003
14 Apr 2017	068	007
15 Apr 2017	067	013

Bulletin

Solar activity was at very low levels during the period. The only event was a B2.4 flare peaking at 14:32 UT yesterday. The flare was produced by NOAA 2650 Active Region (McIntosh class: Cso; Mag.Type: Beta). The X-Ray solar flux remained below B-class flaring level afterwards. No Earth-directed CMEs was observed in coronagraph imagery. Integral proton flux for protons with energies above 10 MeV remained at background level. B-class flaring is expected. Solar wind speed gradually decreased from 440 km/s to 400 km/s by the end of the period. The interplanetary magnetic field was below 5 nT. Bz fluctuated between -2.1 and +2.5 nT. Quiet geomagnetic conditions (K Dourbes between 0 and 2; NOAA Kp between 0 and 2) were registered in the past 24 hours. Quiet geomagnetic conditions are expected today (13 April). Unsettled geomagnetic conditions are possible from tomorrow (14 April) due to potential glancing blow from 10 April CME. Isolated episodes of active geomagnetic conditions can be expected from 15 April due to the influence of possible CME effects or of high speed streams from a low latitude coronal hole.

Today's estimated international sunspot number (ISN): 025, based on 20 stations.

Solar indices for 12 Apr 2017

Wolf number Catania	027
10cm solar flux	071
AK Chambon La Forêt	006
AK Wingst	004
Estimated Ap	005
Estimated international sunspot number	019 - Based on 27 stations

Noticeable events summary

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

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