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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2025 Mar 19 1250 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
19 Mar 2025	183	013
20 Mar 2025	179	016
21 Mar 2025	175	013

Solar Active Regions and flaring

A total of 12 numbered sunspot groups were identified on the disk over the past 24 hours Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C2.1 flare (SIDC Flare 3875) peaking on March 18 at 21:12 UTC, which was produced by SIDC Sunspot Group 405 (NOAA Active Regions 3996, 4028). SIDC Sunspot Groups 405 and 440 (NOAA Active Region 4028 and 4031) are the most complex regions on disk with Beta-Gamma magnetic configuration. SIDC Sunspot Group 428 (NOAA Active Region 4019) has started to rotate over the west limb. Solar flaring activity is expected to be moderate over the next 24 hours, with C-class flares expected and M-class flares likely.

Espulsioni di massa coronale

No Earth-directed Coronal Mass Ejections (CMEs) have been detected in the available coronagraph images.

Fori coronali

SIDC Coronal Hole 93 (equatorial coronal hole with a negative polarity) started to cross the central meridian on March 19.

Vento solare

In the past 24 hours solar wind conditions at Earth became disturbed, due to the arrival of a high-speed stream (HSS). The total interplanetary magnetic ranged from 5 nT to 13 nT, with the Bz component reaching a minimum of -11 nT. The solar wind speed, as measured by ACE, ranged from 350 km/s to 570 km/s. There was a data gap in ACE solar wind data between 00 UTC and 06 UTC. The phi-angle was mainly in the negative sector (directed towards the Sun) with periods in the positive sector. The solar wind conditions are expected to remain disturbed in the next 24 hours due to the ongoing influence of the HSS and the possible arrival of a CME that left the Sun on March 17.

Geomagnetism

The geomagnetic conditions over the past 24 hours globally and locally reached active conditions (Kp 4 K & BEL 4). Active conditions are expected for the next 24 hours.

Proton flux levels

Over the past 24 hours, the greater than 10 MeV GOES proton flux was at background levels and is expected to remain so over the next days.

Electron fluxes at geostationary orbit

The greater than 2 MeV electron flux, as measured by GOES-18 satellites, exceeded the 1000 pfu threshold between 17:05 UTC and 17:15 UTC and between 20:25 UTC and 20:55 UTC on March 18. The electron flux is expected to remain below the threshold in the coming 24 hours. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Today's estimated international sunspot number (ISN): 167, based on 16 stations.

Solar indices for 18 Mar 2025

Wolf number Catania	///
10cm solar flux	184
AK Chambon La Forêt	022
AK Wingst	013
Estimated Ap	014
Estimated international sunspot number	193 - Based on 22 stations

Noticeable events summary

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

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