Affichage des archives de dimanche, 30 juillet 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Jul 30 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
30 Jul 2017	075	008
31 Jul 2017	079	015
01 Aug 2017	080	006

Bulletin

Solar activity was at very low levels. Sunspot group NOAA 2669 (Catania 40) is visible at location N17W30. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Mostly quiet flaring conditions are expected, with an increasing chance on a C-class flare from returning active region NOAA 2665.

Solar wind speed decreased further from about 430 to 370 km/s. Bz oscillated between -3 and +4 nT (DSCOVR). The interplanetary magnetic field was mostly directed away from the Sun. A small negative equatorial coronal hole (CH) transited the central meridian from 27 till 29 July.

The geomagnetic field was at quiet levels with a single unsettled episode recorded at Dourbes during the 15-18UT interval. Quiet to unsettled geomagnetic conditions are expected until the arrival of the particle stream associated with the aforementioned CH, which may start influencing the earth environment late on 30 or on 31 July, possibly resulting in an active episode.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 013, sur la base de 17 stations.

Indices solaires pour 29 Jul 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	070
AK Chambon La Forêt	007
AK Wingst	006
Ap estimé	004
Nombre international de taches solaires estimé	000 - Basé sur 25 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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