Viewing archive of Friday, 14 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 14 1304 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
14 Apr 2017	074	017
15 Apr 2017	075	013
16 Apr 2017	074	011

Bulletin

Solar activity was at very low levels. No flares were observed during the reporting period. CACTUS detected a narrow NW CME from LASCO C2 images around 17:36 UT yesterday. This CME is not expected to be geoeffective. Integral proton flux for protons with energies above 10 MeV remained at background level. B-class flaring is expected.

Solar wind speed fluctuated strongly between 450 km/s to 400 km/s during the period. The interplanetary magnetic field gradually increased from 3 nT to 8 nT. Bz fluctuated between -3 and +3 nT before 00 UT and then gradually decreased to -6 nT. Geomagnetic conditions were ranged K Dourbes between 1 and 3; NOAA Kp between 1 and 4 during the reporting period. A high speed stream from a positive coronal hole (CH HSS) is expected to disturb further the solar wind environment. Active geomagnetic conditions are expected. Isolated episodes of minor storm are possible

Today's estimated international sunspot number (ISN): 016, based on 15 stations.

Solar indices for 13 Apr 2017

Wolf number Catania	028
10cm solar flux	074
AK Chambon La Forêt	014
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	024 - Based on 30 stations

Noticeable events summary

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

All times in UTC

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