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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2020 May 17 1231 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
17 May 2020	070	004
18 May 2020	070	007
19 May 2020	070	007

Bulletin

The Sun was spotless. Solar activity was at very low levels. Two small active regions have rotated over the east limb. Based on their latitudes (resp. at N32 and S23) and STEREO-A/EUVI imagery, these are not the return of former ARs NOAA 2762 and 2761 but genuinely new regions. However, they are currently spotless and were the sources of only some minor A-class flaring. Solar activity is expected to stay at very low levels, with a small chance on an isolated C-class flare.

The greater than 10 MeV proton flux and the greater than 2 MeV electron flux were at nominal levels during the last 24 hours and are expected to remain so.

No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery.

Solar wind speed varied between 290 and 330 km/s, ending the period near 300 km/s. Bz oscillated between -3 and +4 nT (DSCOVR). The direction of the interplanetary magnetic field (phi angle) was in a predominately positive orientation (away from the Sun).

Geomagnetic activity was at quiet levels, with an unsettled interval recorded by Dourbes (14-17UT). Geomagnetic conditions are expected to be mostly quiet with an occasional unsettled episode possible.

Today's estimated international sunspot number (ISN): 000, based on 25 stations.

Solar indices for 16 May 2020

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	///
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	000 - Based on 26 stations

Noticeable events summary

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

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