Affichage des archives de vendredi, 27 juin 2025

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2025 Jun 27 1240 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
27 Jun 2025	118	019
28 Jun 2025	117	024
29 Jun 2025	116	012

Régions solaires actives et éruptions solaires

Solar flaring activity was low over the past 24 hours, with only C-class flares identified. The largest flare was a C1.9 flare (SIDC Flare 4765) peaking on June 27 at 03:05 UTC, which was produced by SIDC Sunspot Group 533 (NOAA Active Region 4122). During the flare, the source region (AR 4122) of the flare had beta configuration of its photospheric magnetic field. A total of 5 numbered sunspot groups were identified on the disk over the past 24 hours. SIDC Sunspot Group 530 (NOAA Active Region 4120) is the complex region with its beta-gamma magnetic configurations. The solar flaring activity is expected to be at low to moderate levels over the next 24 hours with C-class flares expected, M-class flares probable, and a small chance of X-class flares.

Éjection de masse coronale

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

Vent solaire

Earth is still inside a fast solar wind stream, with the continuous arrival of high speed streams (HSSs) from the large SIDC Coronal Hole 116 (negative polarity) which started to cross the central meridian on Jun 21. The solar wind speed ranged from 595 km/s to 810 km/s. The interplanetary magnetic field ranged between 3 nT and 11 nT, and the North- South component (Bz) ranged betweeen -9 nT and 9 nT. In the next 24 hours, enhanced solar wind conditions are expected to continue with the further arrival of HSSs from the same coronal hole.

Géomagnétisme

Geomagnetic conditions were globally at unsettled to minor storm conditions (NOAA Kp 3 to 5), and locally at quiet to active conditions (K_BEL 2 to 4) during the past 24 hours. The disturbed geomagnetic conditions was due to the further arrival of high speed streams (HSSs) from the large SIDC Coronal Hole 116 (negative polarity) which started to cross the central meridian on Jun 21. In the next 24 hours, unsettled to minor storm conditions (K 3 to 5) are possible with the continuous arrival of HSSs from the same coronal hole.

Niveaux de flux de protons

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.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux, as measured by GOES-19 and GOES-18 satellites, remained below the 1000 pfu threshold level almost all the time, except for brief instance around 11:30 UTC and 07:30 UTC on Jun 27, respectively, during which they exceeded the threshold level. In the next 24 hours, the electron flux may briefly exceed the threshold level. The 24h electron fluence is presently at normal level, and it is expected to remain so in the next 24 hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 119, sur la base de 15 stations.

Indices solaires pour 26 Jun 2025

Nombre de Wolf, observé par Catania	100
Flux solaire à 10 cm	117
AK Chambon La Forêt	037
AK Wingst	031
Ap estimé	031
Nombre international de taches solaires estimé	101 - Basé sur 21 stations

Résumé des événements marquants

Données fournies par le Solar Influences Data analysis Center© - SIDC - Traité par SpaceWeatherLive

Toutes les heures sont indiquées en UTC

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