Affichage des archives de jeudi, 13 juillet 2023

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2023 Jul 13 1259 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Warning condition (activity levels expected to increase, but no numeric forecast given)

	Flux de 10 cm	Ap
13 Jul 2023	194	014
14 Jul 2023	194	021
15 Jul 2023	190	024

Régions solaires actives et éruptions solaires

Solar flaring activity was at low to border line moderate levels in the past 24 hours with multiple high C-class flaring mostly from NOAA AR 3372 (beta-gamma), which has further rotated from near the north-east limb becoming the second largest active region on visible solar disc. The strongest activity produced by this region was an impulsive C9.4-flare with start time 05:05 UTC, peak time 05:21 UTC and end time 05:28 UTC on July 13th. The remaining notable flaring activity was produced by NOAA AR 3361 (beta-gamma), which is now approaching the west limb. NOAA AR 3363 (beta-gamma-delta) is currently the largest and most complex active region on the visible solar disc. Yet is has remained silent. NOAA AR 3367 (beta-gamma) exhibited slight decay and remained quiet. The remaining active regions have been relatively simple and inactive. The solar flaring activity is expected to be at low to moderate levels over the coming days with probable isolated M-class flaring and remaining chances for isolated X-class flaring.

Éjection de masse coronale

A faint and relatively slow westward partial halo coronal mass ejection (CME) was first observed in LASCO/C2 coronagraph data at 22:12 UTC on July 12th. The CME does not have any clear on-disc signatures and is deemed to be bask-sided. No new Earth-directed CMEs have been detected in the available coronagraph imagery.

Vent solaire

Over the past 24 hours the solar wind parameters (ACE and DSCOVR) registered the arrival of solar wind transient around 19:30 UTC on July 12th, possibly as an early precursor of the expected glancing blow ICME arrival from the July partial halo 10th CME. The solar wind velocity was steady around 300 km/s. The interplanetary magnetic field showed enhancements and continues to increase, currently at 9.5 nT. The north- south Bz component was predominantly positive with a minimum value of -5.7 nT. The B field remained predominantly in the positive sector (directed away from the Sun). The solar wind conditions are expected to be elevated due to the possible glancing blow ICME arrival and an expected high speed stream arrival over the coming 24h.

Géomagnétisme

The geomagnetic conditions over the past 24 hours were globally quiet and quiet to unsettled locally over Belgium. Quiet to active geomagnetic conditions with chances for isolated minor storms are expected for the next 24h. Quiet conditions to minor storm levels are expected for 14th and July 15th with some chances for isolated moderate storms.

Niveaux de flux de protons

Over the past 24 hours the greater than 10 MeV GOES proton flux was at nominal levels and is expected to continue so over the next days, pending no strong eruptive on-disc solar activity. Chances for enhanced protons fluxes remain particularly due to possible flaring and CME activity driven by NOAA AR 3372 and NOAA AR 3363.

Flux d'électrons sur l'orbite géostationnaire

The greater than 2 MeV electron flux as measured by GOES 16 was below the 1000 pfu threshold, while the corresponding electron flux measured by GOES 18 briefly exceeded the 1000 pfu around 20:00 UTC on July 12th. The greater than 2 MeV electron flux is expected to be mostly below the 1000 pfu threshold in the upcoming days. The 24h electron fluence was at nominal levels and is expected to remain so over the next days.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 150, sur la base de 19 stations.

Indices solaires pour 12 Jul 2023

Nombre de Wolf, observé par Catania	240
Flux solaire à 10 cm	193
AK Chambon La Forêt	012
AK Wingst	010
Ap estimé	008
Nombre international de taches solaires estimé	198 - 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

<< Aller à l'aperçu quotidien