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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Mar 15 1231 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

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

Protoni solari

Quiet

	10cm flux	Ap
15 Mar 2026	110	019
16 Mar 2026	115	013
17 Mar 2026	115	011

Solar Active Regions and flaring

Solar flaring activity was moderate over the past 24 hours, with 1 M-class flare identified. The largest flare was a M1.0 flare (SIDC Flare 7215) peaking on March 15 at 09:39 UTC, which was produced by SIDC Sunspot Group 820 (NOAA Active Region 4392). SIDC Sunspot Group 819 (NOAA Active Region 4393) was in charge of the majority of the C-class flaring over the past 24 hours. A total of 5 numbered sunspot groups were identified on the disk over the past 24 hours, all having simple (alpha or beta) magnetic configuration. Solar flaring activity is expected to be low over the next 24 hours, with C-class flares likely and a small chance for M-class flares.

Espulsioni di massa coronale

No new Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Fori coronali

The southern midlatitude extension of the large positive polarity trans-equatorial coronal hole (SIDC Coronal Hole 154) is still crossing the central meridian. The associated high-speed stream is currently enhancing solar wind conditions at Earth.

Vento solare

The solar wind conditions were enhanced over the past 24 hours, due to the influence of the high-speed streams associated with the SIDC coronal hole 154 (which first reached the central meridian in Mar 11). The interplanetary magnetic field reached 9 nT and is currently at 5 nT, with the Bz reaching a minimum value of -7 nT. The solar wind velocity reached 700 km/s and are currently around 650km/s. Enhanced solar wind conditions are expected in the next 24 hours.

Geomagnetism

The geomagnetic conditions were globally mainly active and reached minor storm levels (NOAA Kp 5) between 12:00 and 15:00 UTC on Mar 14 (Locally unsettled to active conditions (K BEL 4)), due to the high speed stream arrival of the SIDC CH 154. Unsettled to active conditions are expected for the next 24 hours.

Proton flux levels

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

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold, and is expected to remain below the threshold during the next 24 hours. The 24h electron fluence was at normal levels and is expected to remain so.

Today's estimated international sunspot number (ISN): 071, based on 16 stations.

Solar indices for 14 Mar 2026

Wolf number Catania	///
10cm solar flux	112
AK Chambon La Forêt	037
AK Wingst	036
Estimated Ap	037
Estimated international sunspot number	063 - Based on 20 stations

Noticeable events summary

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

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