Affichage des archives de samedi, 29 juillet 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Jul 29 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

Quiet

	Flux de 10 cm	Ap
29 Jul 2017	071	003
30 Jul 2017	075	009
31 Jul 2017	079	015

Bulletin

Solar activity was at very low levels, and is expected to remain so. A barely visible sunspot group (Catania 40) is at location N19W15. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux is near background levels.

Old active region NOAA 2665 is expected to round the east limb on 31 July and may gradually increase the chance on a C-class flare already on 30 July. Also the 10.7 cm radio flux is expected to increase well before the region will actually become visible.

Solar wind speed varied steadily between 470-420 km/s, showing a generally declining trend (DSCOVR). Bz oscillated between -5 and +5 nT during the entire period. 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 to unsettled levels and is expected to remain so until the arrival of the particle stream associated with the aforementioned CH, which may start influencing the earth environment on 30 or 31 July, with active geomagnetic conditions possible.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 21 stations.

Indices solaires pour 28 Jul 2017

Nombre de Wolf, observé par Catania	012
Flux solaire à 10 cm	070
AK Chambon La Forêt	013
AK Wingst	010
Ap estimé	009
Nombre international de taches solaires estimé	000 - 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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