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Daily bulletin on solar and geomagnetic activity from the SIDC

Существующий: 2026 Apr 29 1247 UTC

SIDC Forecast

Солнечные вспышки

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Солнечные протоны

Quiet

	10cm flux	Ap
29 Apr 2026	140	017
30 Apr 2026	135	022
01 May 2026	135	025

Solar Active Regions and flaring

Solar flaring activity was moderate over the past 24 hours, with 3 M-class flares identified. The largest flare was a M1.5 flare (SIDC Flare 7545) peaking on April 28 at 13:53 UTC, which was produced by SIDC Sunspot Group 847 (NOAA Active Region 4420). A total of 9 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 847 (NOAA AR 4420) is the most complex region, with a beta-gamma-delta magnetic configuration, which has produced all the M-class flaring activities over the past 24 hours. Solar flaring activity is expected to be low to moderate over the next 24 hours, with few C-class flares, possibly M-class flares and a low chance for X-class flares.

Выбросы корональной массы

No Earth-directed coronal mass ejections (CMEs) were detected in the available coronagraph observations during the last 24 hour.

Корональные отверстия

SIDC Coronal Hole (CH) 142, spanning 25 N - 80 N (recurrent negative polarity), has started to cross the central meridian on Apr 29, and the high-speed streams from this CH may enhance the solar wind environment near Earth during May 02-06.

Солнечный ветер

Earth is presently within the slow solar wind regime, speed ranging from 310 km/s to 380 km/s. The North-South component (Bz) ranged between -4 and 4 nT. The interplanetary magnetic field ranged between 1 nT to 5 nT. Slow solar wind conditions are expected to continue over the next 24 hours unless the high speed streams from the SIDC Coronal Hole 149, which crossed the central meridian during Apr 26-28 (recurrent negative polarity), arrives at Earth.

Geomagnetism

Geomagnetic conditions were globally and locally quiet (NOAA Kp 0 to 1 and K BEL 1 to 2). In the next 24 hours, active to minor storm conditions (K 4 to 5) are possible if the high speed streams from the SIDC Coronal Hole 149, which crossed the central meridian during Apr 26-28 (recurrent negative polarity), arrives at Earth.

Proton flux levels

The greater than 10 MeV GOES proton flux was below the threshold level over the past 24 hours and it is expected to remain so for the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-19 and GOES-18 satellites, remained below the threshold level over the past 24 hours and is expected to remain so in the coming 24 hours. The 24h electron fluence is presently at normal level and is expected to be at normal to moderate levels in the next 24 hours.

Today's estimated international sunspot number (ISN): 134, based on 18 stations.

Solar indices for 28 Apr 2026

Wolf number Catania	160
10cm solar flux	///
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	003
Estimated international sunspot number	141 - Based on 27 stations

Noticeable events summary

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

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