Viewing archive of Friday, 7 April 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Apr 07 1230 UTC

SIDC Forecast

Solar flares

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
07 Apr 2017	072	008
08 Apr 2017	070	005
09 Apr 2017	072	009

Bulletin

Solar activity was at low levels during the period. Two C-class flares were recorded: a C5.5 flare at the very beginning of the period (12:10UT), and a C2.7 event peaking at 00:25UT. Both flares originated from NOAA 2645's trailing portion, which is now very close to the west limb. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

C-class flaring remains possible, with a small chance on an isolated M-class flare.

Solar wind speed gradually decreased from an initial 490 km/s to 420 km/s by the end of the period. Bz fluctuated between -5 and +4 nT. The interplanetary magnetic field was mostly directed towards the Sun. The particle stream from a narrow extension from the positive polar coronal hole may affect the earth environment on 9 or 10 April.

The geomagnetic field was at quiet to unsettled levels and is expected to remain so, with only a small chance on an isolated active episode.

Today's estimated international sunspot number (ISN): 027, based on 16 stations.

Solar indices for 06 Apr 2017

Wolf number Catania	044
10cm solar flux	076
AK Chambon La Forêt	014
AK Wingst	009
Estimated Ap	008
Estimated international sunspot number	037 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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