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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2026 Feb 27 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
27 Feb 2026	131	012
28 Feb 2026	133	026
01 Mar 2026	135	023

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 C6.3 flare from the east limb (SIDC Flare 7084) peaking at 19:09 UTC on February 26. There are currently three numbered active regions on the solar disk. The most complex one is SIDC Sunspot Group 803 (NOAA Active Region 4380, magnetic type beta-gamma), which has rotated on disc from the east limb, in the southeast quadrant. The solar flaring activity is expected to be low over the next 24 hours, with C-class flares very likely and a chance for M-class flares.

Espulsioni di massa coronale

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

Vento solare

Over the past 24 hours, the solar wind parameters (ACE and DSCOVR) are gradually returning to the slow solar wind regime, under the waning influence of the high-speed stream from the recurrent, negative polarity, equatorial, coronal hole (SIDC Coronal Hole 147). The solar wind speed decreased from approximately 530 km/s to the current value of approximately 450 km/s. The interplanetary magnetic field values were between 3 nT and 6 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 were mostly at quiet to unsettled levels (NOAA Kp 2 to 3). Geomagnetic conditions locally were mostly at quiet to unsettled levels (K BEL 2 to 3), with an interval of active conditions (KBEL 4) between 19:00 UTC and 22:00 UTC on February 26. 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 and GOES 19 was mostly above the 1000 pfu threshold in the last 24 hours. 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): 040, based on 18 stations.

Solar indices for 26 Feb 2026

Wolf number Catania	040
10cm solar flux	130
AK Chambon La Forêt	021
AK Wingst	019
Estimated Ap	020
Estimated international sunspot number	033 - Based on 29 stations

Noticeable events summary

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

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