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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 May 06 1230 UTC

SIDC Forecast

Brillamenti solari

Quiet conditions (<50% probability of C-class flares)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
06 May 2019	075	006
07 May 2019	075	015
08 May 2019	075	016

Bulletin

Solar activity was dominated by NOAA region 2740 which produced several C flares including an impulsive C9.9 flare peaking at 5:10UT. Continued flux emergence is observed in the region with mixed polarity fields making continued C flaring likely.

The C9.9 flare was associated with radio bursts and an EUV dimming signs of a CME initiation. Incomplete coronagraph data from both STEREO-A COR2 as well as SoHO LASCO C2 and C3 seem to indicate that the CME was not particularly wide and hence it is currently assumed that it is not Earth directed. This remains to be confirmed though by more complete coronagraph imagery.

Solar proton flux levels were at background values and are expected to remain so.

Solar wind speed decreased to under 400 km/s and total magnetic field remained at nominal values under 5 nT, with a variable Bz component. The phi angle was in the negative sector. Solar wind conditions are first expected to remain nominal with later towards May 8 the possible influence of an equatorial coronal hole setting in.

Geomagnetic conditions were quiet (both local K Dourbes and NOAA Kp 0-2). Geomagnetic conditions are expected to remain quiet, later increasing to unsettled conditions with a slight chance for an isolated active period due to high speed stream effect.

Today's estimated international sunspot number (ISN): 014, based on 19 stations.

Solar indices for 05 May 2019

Wolf number Catania	///
10cm solar flux	074
AK Chambon La Forêt	008
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	013 - Based on 22 stations

Noticeable events summary

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

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