Affichage des archives de dimanche, 20 septembre 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Sep 20 1230 UTC

Prévisions SIDC

Éruptions solaires

M-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
20 Sep 2015	110	029
21 Sep 2015	115	029
22 Sep 2015	115	017

Bulletin

A new active region (NOAA 2420) rounded the northeast limb and produced the strongest flare of the period, an M1.5 flare peaking at 05:03UT. Based on some scarce SOHO and STEREO-A coronagraph imagery, no coronal mass ejection (CME) seems to be associated to this event. The group's proximity to the limb currently hampers an accurate assessment of its magnetic configuration. The other sunspot regions were stable and relatively quiet, NOAA 2419 and NOAA 2415 producing resp. 1 and 2 low-level C-class flares.

C-class flares are expected, with a good chance on another M-class flare.

After the passing of the brief negative sector boundary ("toward" phi angle) on 19 September, solar wind speed gradually increased from about 400 km/s to 450 km/s early this morning. A shock in the solar wind speed was observed at 05:27UT, with an abrupt increase to 550 km/s. After that, solar wind speed oscillated between mostly 500 and 600 km/s. The source of the disturbance is most likely the earlier than expected arrival of the 18 September coronal mass ejection (CME). Bz initially turned sharply negative with values up to -18 nT. Since about 06:00UT Bz varies between +7 and -12 nT, being predominantly negative. This resulted in strong geomagnetic storming, with the planetary K-index reaching 7 (major storm) and the local K Dourbes at 5 (minor storm).

Quiet to active geomagnetic conditions are expected, with a good chance on another minor storming episode in the wake of the solar wind disturbance.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 062, sur la base de 22 stations.

Indices solaires pour 19 Sep 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	106
AK Chambon La Forêt	025
AK Wingst	016
Ap estimé	017
Nombre international de taches solaires estimé	061 - 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