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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 May 18 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
18 May 2026	106	006
19 May 2026	103	009
20 May 2026	100	006

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only three C-class flares identified. The brightest flare was SIDC flare 7724, a C9.7 with its peak on 17 May at 20:53 UTC. It was associated with SIDC Sunspot Group 825 (NOAA Active Region 4436, Beta magnetic configuration). The solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a small chance for M-class flares.

Espulsioni di massa coronale

No Earth-directed Coronal Mass Ejections (CME) were observed in the last 24 hours.

Vento solare

The effect of the High Speed Stream (HSS) that arrived on 15 May waned during the past 24 hours and currently the Solar Wind (SW) conditions feature a slow regime. The SW speed dropped from almost 700 to 500 km/s, the interplanetary magnetic field (B) reached a maximum value of 4 nT, and its North-South component (Bz) varied from -4 to 4 nT. A glancing blow from a Coronal Mass Ejection (SIDC CME 656) is predicted to arrive in the next 24 hours, however, no significant impact is expected from it.

Geomagnetism

The geomagnetic conditions of the past 24 hours were both globally and locally at quiet levels (NOAA Kp 2 to 2+ and K BEL 1 to 2), with the exception of locally unsettled levels for a brief period of time (K BEL 3, 17 May 12:00-15:00 UTC). In the next 24 hours it is likely that they will increase to unsettled levels, as a glancing blow from SIDC CME 656 is expected to arrive at Earth.

Proton flux levels

The greater than 10 MeV proton flux, as measured by the GOES-19 satellite, was at nominal levels over the past 24 hours and is likely to remain so in the next 24 hours.

Electron fluxes at geostationary orbit

During the past 24 hours the greater than 2 MeV electron flux as, measured by GOES 19, was above the 1000 pfu alert threshold with a peak value of 5900 pfu on 17 May at 20:53 UTC. It is expected to remain above the alert threshold in the next 24 hours. The electron fluence was at moderate in the past 24 hours and it is expected to remain at those levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 086, based on 22 stations.

Solar indices for 17 May 2026

Wolf number Catania	///
10cm solar flux	104
AK Chambon La Forêt	014
AK Wingst	012
Estimated Ap	010
Estimated international sunspot number	093 - Based on 21 stations

Noticeable events summary

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

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