Viewing archive of Wednesday, 12 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 12 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
12 Apr 2017	075	010
13 Apr 2017	076	010
14 Apr 2017	077	008

Bulletin

Solar activity was at low levels during the period. The strongest event was a B1.4 flare peaking at 19:45 UT yesterday. This flare was produced by NOAA 2650 (McIntosh: Cao; Mag.Type: Beta). No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels. B-class flaring is expected, with a small chance on an isolated C-class flare. Solar wind speed increased from about 420 km/s to values around 490 km/s (00UT, 12/04), but then decreased again till 450 km/s. The total interplanetary magnetic field (IMF) strength, as recorded by the DSCOVR satellite, has been around 5 nT. Bz fluctuated between -4.5 and +4 nT, being mostly negative. Solar wind parameters are expected to decline further today. The geomagnetic field was at quiet to unsettled levels, Kp NOAA index: 2-3, local K Dourbes index: 1-3. Quiet to unsettled conditions are expected, with a chance on an active episode.

Today's estimated international sunspot number (ISN): 020, based on 20 stations.

Solar indices for 11 Apr 2017

Wolf number Catania	015
10cm solar flux	075
AK Chambon La Forêt	023
AK Wingst	015
Estimated Ap	014
Estimated international sunspot number	014 - 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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