Viewing archive of Saturday, 28 February 2026

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2026 Feb 28 1231 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
28 Feb 2026	140	018
01 Mar 2026	144	018
02 Mar 2026	148	010

Solar Active Regions and flaring

Solar flaring activity was low over the past 24 hours, with only C-class flares. The strongest flare was a C6.4 flare (SIDC Flare 7095), peaking at 03:13 UTC on February 28, which was associated with SIDC Sunspot Group 803 (NOAA Active Region 4380). There are currently four numbered active regions on the solar disk. SIDC Sunspot Groups 801, 803, 804 (NOAA Active Regions 4378, 4380, 4381) are the most complex ones, with magnetic type beta. SIDC Sunspot Group 804 (NOAA Active Region 4381) has rotated on disc from the east limb, in the northeast quadrant. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a small chance for M-class flares.

Coronal mass ejections

No Earth-directed Coronal Mass Ejections (CMEs) were observed in the available coronagraph imagery in the last 24 hours.

Solar wind

Over the past 24 hours, the solar wind parameters (ACE and DSCOVR) reflected mostly slow solar wind conditions. Speed values ranged between 490 km/s and 380 km/s. The interplanetary magnetic field values were between 3 nT and 5 nT. The Bz component varied between -4 nT and 3 nT. The interplanetary magnetic field angle was mostly in the negative sector. Enhanced solar wind conditions may be possible over the next 24 hours, due to the possible arrival of a glancing blow associated with the Coronal Mass Ejection (SIDC CME 607) observed at 07:00 UTC on February 25.

Geomagnetism

Geomagnetic conditions globally and locally were mostly at quiet to unsettled levels (NOAA Kp 2 to 3+, K BEL 1 to 3). Active to minor storm conditions may be possible over the next 24 hours, due to the possible arrival of a glancing blow associated with the Coronal Mass Ejection (SIDC CME 607) observed at 07:00 UTC on February 25.

Proton flux levels

The greater than 10 MeV proton flux was below the 10 pfu threshold level over the past 24 hours. It is expected to remain below the threshold level over the next 24 hours.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux measured by GOES 18 was mostly above the 1000 pfu threshold in the last 24 hours. The greater than 2 MeV electron flux measured by GOES 19 was above the 1000 pfu threshold until around 04:00 UTC on February 28 and has remained below the threshold since. The greater than 2 MeV electron flux is expected to remain around the 1000 pfu threshold levels in the next 24 hours. The 24-hour electron fluence is presently at moderate levels and is expected to remain so over the next 24 hours.

Today's estimated international sunspot number (ISN): 055, based on 05 stations.

Solar indices for 27 Feb 2026

Wolf number Catania	044
10cm solar flux	139
AK Chambon La Forêt	015
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	042 - Based on 25 stations

Noticeable events summary

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

All times in UTC

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