Affichage des archives de jeudi, 14 septembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Sep 14 1230 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

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

Moniteur de Flux de Proton

Proton event in progress (>10 MeV)

	Flux de 10 cm	Ap
14 Sep 2017	074	019
15 Sep 2017	073	015
16 Sep 2017	073	006

Bulletin

The only sunspot group currently reported on the solar disk, Catania number 55, NOAA AR 2680, is unlikely to produce flaring activity above the B-level. No flares were reported in the past 24 hours. The proton event associated with the halo CME on September 10 is still ongoing.

A fast forward shock was detected in the solar wind by DSCOVR around 00:21 UT on September 14, with clear jumps of the solar wind speed, density, temperature, and the interplanetary magnetic field (IMF) magnitude. The solar origin of the shock is unclear. The solar wind speed in the post- shock sheath region was around 390 km/s, so the departure from the Sun on September 10 in association with the limb full halo CME is possible. The IMF magnitude in the sheath did not exceed 8 nT, with the north-south IMF component fluctuating. Geomagnetic conditions remained quiet, with both NOAA Kp and Dourbes K indices equalling 2.

The Earth is currently inside a slow (around 410 km/s) solar wind flow. The increase of plasma density and the IMF magnitude in the last couple of hours may indicate the arrival of the interaction region between the slow and fast solar wind flows. The fast flow emanates from a low-latitude extension of the northern polar coronal hole, and its arrival can be expected later today. Active to minor storm conditions may be expected.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 012, sur la base de 19 stations.

Indices solaires pour 13 Sep 2017

Nombre de Wolf, observé par Catania	012
Flux solaire à 10 cm	075
AK Chambon La Forêt	012
AK Wingst	014
Ap estimé	014
Nombre international de taches solaires estimé	015 - Basé sur 22 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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