Affichage des archives de vendredi, 18 septembre 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Sep 18 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
18 Sep 2015	109	026
19 Sep 2015	109	027
20 Sep 2015	109	015

Bulletin

NOAA 2415 remains magnetically complex, with a weakening delta but also with some new opposite polarity flux emerging in front (to the west) of the main spot. Ten C-class flares were observed, all produced by NOAA 2415. The strongest was a C6.7 peaking at 21:15UT. NOAA2419 showed some interaction with NOAA 2415 during/following a long duration C2.6 flare that started at 04:22UT and peaked at 06:31UT. Some coronal dimming to the west of NOAA 2415 was observed, as well as a Type II radio-burst. Standing-by coronagraphic imagery to evaluate the effects of the associated coronal mass ejection.

More C-class flares are expected, with a chance on an M-class flare from NOAA 2415.

Solar wind speed continued its gradual decline from its initial values near 460 km/s to its current 400 km/s. Bz varied between -6 and +4 nT, being predominantly negative after 21:00UT. The interplanetary magnetic field pointed mostly away from the Sun. Quiet to unsettled conditions were observed, with active episodes around midnight observed in Dourbes.

Quiet to active geomagnetic conditions are expected. Minor geomagnetic storming is possible late on 18 or on 19 September in response to the anticipated arrival of the high speed stream of a transequatorial coronal hole.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 069, sur la base de 22 stations.

Indices solaires pour 17 Sep 2015

Nombre de Wolf, observé par Catania	081
Flux solaire à 10 cm	107
AK Chambon La Forêt	014
AK Wingst	014
Ap estimé	014
Nombre international de taches solaires estimé	068 - Basé sur 24 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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