Affichage des archives de dimanche, 26 juillet 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Jul 26 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
26 Jul 2015	098	008
27 Jul 2015	103	008
28 Jul 2015	109	012

Bulletin

There are currently 2 sunspot groups visible on the solar disk. NOAA 2389 is small and produced only B-class flares. NOAA 2390 shows some mixed magnetic polarity mixing in its asymmetric trailing portion. No C-class flares were recorded. Two significant coronal mass ejections (CMEs) were observed on 25 July starting resp. at 14:48UT (northwest) and 19:24UT (northeast), but they were both backside events. No earth-directed CMEs were observed.

There's a reasonable chance on C-class flares.

Solar wind speed varied mostly between 390 and 450 km/s, while Bz fluctuated between -6 and +6 nT under the influence from a moderate-speed stream from the northern coronal hole (CH) starting around 18:00UT on 25 July. Mostly quiet to unsettled geomagnetic conditions were observed. The wind stream from a small equatorial positive coronal hole (CH) may influence the earth environment on 28-29 July.

Mostly quiet to unsettled geomagnetic conditions are expected, with a small chance on an active episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 043, sur la base de 15 stations.

Indices solaires pour 25 Jul 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	094
AK Chambon La Forêt	015
AK Wingst	011
Ap estimé	010
Nombre international de taches solaires estimé	036 - Basé sur 20 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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