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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Mar 29 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
29 Mar 2026	162	006
30 Mar 2026	158	007
31 Mar 2026	150	005

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with a few C-class flares identified. SIDC Sunspot Group (SG) 835 (NOAA Active Region [AR] 4404, Alpha magnetic configuration) produced the brightest flare (SIDC flare 7284, a C2, that peaked on 28 Mar at 21:10 UTC). SIDC SG 830 (NOAA AR 4401, Beta-Gamma magnetic configuration) and SIDC SG 836 (NOAA AR 4405, Beta-Gamma magnetic configuration) also emitted X-ray flares. In the next 24 hours, C-class flaring activity is expected, although isolated M-class activity is still possible.

Espulsioni di massa coronale

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

Vento solare

The Solar Wind (SW) conditions of the past 24 hours are typical of the slow SW regime. The SW speed registered values between 330 and 400 km/s, the interplanetary magnetic field (B) ranged between 2 and 8 nT, and its North-South component (Bz) varied from -5 nT to 2 nT. Slow SW conditions are expected to continue in the next 24 hours.

Geomagnetism

The geomagnetic conditions of the past 24 hours were both globally and locally at quiet to active levels (NOAA Kp 2- to 4- and K BEL 2 to 4). In the next 24 hours it is likely that they drop to unsettled levels, although there is chance of activate levels to still register.

Proton flux levels

The greater than 10 MeV proton flux, as measured by the GOES-18 satellite, was at nominal levels over the past 24 hours and is expected to remain so.

Electron fluxes at geostationary orbit

During the past 24 hours, the greater than 2 MeV electron flux as measured by GOES 19, fluctuated around the 1000 pfu alert threshold. A small drop is expected in the next 24 hours. The electron fluence dropped from moderate to normal levels on 29 Mar at 00:50 UTC. It is expected to remain at normal levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 137, based on 18 stations.

Solar indices for 28 Mar 2026

Wolf number Catania	///
10cm solar flux	162
AK Chambon La Forêt	024
AK Wingst	012
Estimated Ap	011
Estimated international sunspot number	136 - Based on 25 stations

Noticeable events summary

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

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