Affichage des archives de jeudi, 29 juin 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Jun 29 1230 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Quiet (A<20 and K<4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
29 Jun 2017	071	007
30 Jun 2017	070	006
01 Jul 2017	071	006

Bulletin

Solar activity was at very low levels during the period. Decaying sunspot region NOAA 2664 was the source of a long duration event (no x-ray flare reported, but x-ray flux was at B1 level from 13UT till 18UT) during the afternoon of 28 June. SDO EUV imagery indicated coronal dimming both to the north and south of this active region. CACTus detected the associated weak and slow (275-300 km/s) coronal mass ejection (CME) in LASCO/C2 difference images starting at 16:24UT, but as 2 separate CMEs. Though the bulk of this partial halo CME (about 170 degrees angular width) is directed to the southwest, a glancing blow cannot be excluded and may arrive around noon on 3 July (+/- 12 hours). No other earth-directed CMEs were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

Quiet flaring conditions are expected.

Solar wind speed undulated between 460 and 420 km/s, with the maximum speeds observed during the 00-03UT interval. Bz fluctuated between -5 and +4 nT. The interplanetary magnetic field was directed away from the Sun.

The geomagnetic field was at quiet levels, and is expected to be quiet to unsettled for the next few days. The particle stream from a small equatorial coronal hole may briefly enhance geomagnetic conditions later today or tomorrow (30 June), with a small chance on an active episode. A glancing blow from the 28 June CME is possible on 3 July, but the geomagnetic impact is expected to be limited (active conditions at most).

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 012, sur la base de 12 stations.

Indices solaires pour 28 Jun 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	072
AK Chambon La Forêt	007
AK Wingst	004
Ap estimé	004
Nombre international de taches solaires estimé	017 - Basé sur 21 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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