Affichage des archives de mercredi, 8 janvier 2020

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2020 Jan 08 1231 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
08 Jan 2020	072	017
09 Jan 2020	072	015
10 Jan 2020	072	010

Bulletin

The solar activity has been at low levels over the past 24 hours. The sunspot group (Catania sunspot group 25, NOAA 2755) has now decayed. The X-ray flux is below B-level and solar activity is expected to remain at low levels for the next 24 hours.

Two narrow and relatively slow (about 150 km/s) coronal mass ejections were observed on the East and West limb, but no earth-directed components were identified in the available coronagraphic imagery.

The greater than 10 MeV proton flux was at nominal values.

The solar wind speed continued to decrease slowly from about 450 km/s to 354 km/s. The total magnetic field is below 5 nT, and the southern component of the magnetic filed was between -3 nT and 3 nT (as recorded by the ACE spacecraft). Today, starting around 11:10 UTC, weak enhancement of the solar wind can be observed with the wind speed increasing form 354 km/s to the current values of about 400 km/s. We anticipate further enhancements of the solar wind, in a couple of hours, due to the high-speed streams from the equatorial coronal holes that reached the central meridian on Jan 5.

Mostly quiet geomagnetic conditions were observed with Kp-index (NOAA) ranging between 0 and 2, and K-Dourbes between 0 and 3. Active geomagnetic conditions with a possible short-duration minor storm are expected with the arrival of the high-speed streams later today.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 09 stations.

Indices solaires pour 07 Jan 2020

Nombre de Wolf, observé par Catania	011
Flux solaire à 10 cm	072
AK Chambon La Forêt	009
AK Wingst	006
Ap estimé	004
Nombre international de taches solaires estimé	000 - Basé sur 16 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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