Viewing archive of Monday, 27 April 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Apr 27 1246 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
27 Apr 2026	157	014
28 Apr 2026	157	018
29 Apr 2026	155	018

Solar Active Regions and flaring

Solar flaring activity was high over the past 24 hours, with 5 M-class flares identified. The largest flare was a M6.0 flare (SIDC Flare 7519) peaking on April 26 at 22:57 UTC, which was produced by SIDC Sunspot Group 847 (NOAA Active Region (AR) 4420). During the flare, the source region (SIDC Sunspot Group 847) of the flare had beta-gamma-delta configuration of its photospheric magnetic field. A total of 7 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Groups 805 and 847 (NOAA AR 4425 and 4420) are the most complex regions, with a beta-gamma-delta magnetic configuration, which has produced all the M-class flaring activity over the past 24 hours. Solar flaring activity is expected to be at moderate to high over the next 24 hours, with M-class flares very likely and a chance for X-class flares.

Coronal mass ejections

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

Coronal holes

SIDC Coronal Hole (CH) 149, spanning 8 S - 25 S (negative polarity), is crossing the central meridian, and the high-speed streams from this CH may enhance the solar wind environment near Earth on Apr 29-31.

Solar wind

Solar wind parameters were slightly enhanced during the past 24 hours. The solar wind speed ranged from 400 km/s to 500 km/s. The interplanetary magnetic field ranged from 0 nT to 9 nT, and the North-South component (Bz) ranged from -4 nT to 7 nT. Solar wind conditions may get more enhanced if high-speed streams associated with SIDC Coronal Holes 156 and 157 arrive.

Geomagnetism

Geomagnetic conditions were globally at quiet to unsettled conditions (NOAA Kp 1 and 3) globally, and locally at quiet to active conditions (K_BEL 1 to 4) during the past 24 hours. Active to minor storm conditions are expected over the next 24 hours.

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-18 satellite, increased and exceeded the 1000 pfu threshold level from 20:10 UTC to 23:50 UTC on Apr 26, over the past 24 hours. It may exceed the threshold level again in the next 24 hours. The greater than 2 MeV electron flux, as measured by GOES-19 satellite, was below the 1000 pfu threshold level in the last 24 hours, and is expected to remain so. The 24h electron fluence was at normal levels and is expected to remain so in the coming 24 hours.

Today's estimated international sunspot number (ISN): 132, based on 23 stations.

Solar indices for 26 Apr 2026

Wolf number Catania	///
10cm solar flux	156
AK Chambon La Forêt	019
AK Wingst	012
Estimated Ap	013
Estimated international sunspot number	129 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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