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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2017 Apr 08 1230 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

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

Sluneční protony

Quiet

	10cm flux	Ap
08 Apr 2017	072	018
09 Apr 2017	072	016
10 Apr 2017	070	013

Bulletin

Solar activity was at low levels during the period. Three C-class flares were recorded, the strongest being a C4.3 event at 19:49UT. These flares originated from NOAA 2645's trailing portion, which has rotated over the west limb. The Sun is currently spotless. A small active region, responsible for a B3 flare at 01:48UT, is about to rotate over the east limb. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

An isolated C-class flare remains possible.

Around 17UT, solar wind speed started a gradual increase from its nominal 420 km/s to end the period at 570 km/s and still climbing. Bz fluctuated between -8 and +6 nT. The interplanetary magnetic field was initially directed towards the Sun, but became variable after 17UT to end the period in a steady towards direction. 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, with active episodes (Kp=4) during 21UT-03UT and 06-09UT. Dourbes geomagnetic data were missing for most of the period, but Wingst and Niemegk showed an active episode around midnight too. The geomagnetic field is expected to be at quiet to active levels, in response to particle streams from various coronal holes.

Today's estimated international sunspot number (ISN): 000, based on 23 stations.

Solar indices for 07 Apr 2017

Wolf number Catania	034
10cm solar flux	074
AK Chambon La Forêt	017
AK Wingst	012
Estimated Ap	012
Estimated international sunspot number	023 - Based on 30 stations

Noticeable events summary

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

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