Viewing archive of Thursday, 26 March 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Mar 26 1259 UTC

SIDC Forecast

Solar flares

M-class flares expected (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
26 Mar 2026	142	010
27 Mar 2026	145	005
28 Mar 2026	150	010

Solar Active Regions and flaring

Solar flaring activity was moderate over the past 24 hours, as an M3.9 (SIDC flare 7259) was detected on 26 Mar at 06:23 UTC. It was produced by SIDC Sunspot Group (SG) 832 (NOAA Active Region [AR] 4403) despite having a Alpha magnetic configuration. The same SG also produced three C-class flares at the second half of 25 Mar. SIDC SG 834 is another region of interest as it also produced three C-class flares, although most of it is behind the East limb. Its brightest flare was SIDC flare 7267, a C5 emitted on 26 Mar at 08:47 UTC. It is most likely a much brighter flare, but obscured by the solar limb. Further isolated M-class flares are likely in the next 24 hours, either from SIDC SG 832 or 834.

Coronal mass ejections

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

Solar wind

The Solar Wind (SW) conditions returned to a slow SW regime, as the effects of the High Speed Stream diminished during the last 24 hours. The SW speed decreased from 600 to 400 km/s, the interplanetary magnetic field (B) ranged between 3 and 8 nT, and its North-South component (Bz) varied from -5 nT to 7 nT. A glancing blow from SIDC CME 642 (launched on 22 Mar 23:54 UTC) has a chance of arrival in the next 24 hours, but is expected to have a minor effect.

Geomagnetism

The geomagnetic conditions were globally (NOAA Kp) and locally (K BEL) quiet to unsettled during the past 24 hours. They are expected to remain at quiet to unsettled level during 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

During the past 24 hours, the greater than 2 MeV electron flux as measured by GOES 19 was above the 1000 pfu alert threshold and ranged between 1000 and 10000 pfu. A small drop is expected in the next 24 hours, however it is likely that the electron flux will remain above the alert threshold level. The electron fluence decreased fro high to moderate levels on 25 Mar at 19:35 UTC. It is likely to remain at moderate levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 113, based on 16 stations.

Solar indices for 25 Mar 2026

Wolf number Catania	123
10cm solar flux	140
AK Chambon La Forêt	020
AK Wingst	013
Estimated Ap	015
Estimated international sunspot number	113 - Based on 22 stations

Noticeable events summary

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

All times in UTC

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