Affichage des archives de dimanche, 13 juin 2021

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2021 Jun 13 1231 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
13 Jun 2021	078	009
14 Jun 2021	076	008
15 Jun 2021	076	010

Bulletin

There are presently only two sunspot groups observed on the visible side of the Sun, Catania sunspot group 2 and 6 (NOAA AR 2829 and 2832, respectively). Solar flaring activity is low, with only one B-class flare reported, and we expect it will stay so in the coming hours. Available observations (limited due to system maintenance) do not indicate possible presence of the Earth directed CMEs. The proton flux levels remained at background values. The greater than 2MeV electron flux is bellow the 1000 pfu threshold, and we expect it will remain so in the next 24 hours. The 24h electron fluence is at normal levels and we expect it will stay so in the coming 24 hours.

The in situ observations show the simultaneous increase of the solar wind speed, temperature and the change of the phi angle to positive value, at about 15:00 UT on June 12. The change of these solar wind characteristics was preceded by the small increase and the drop of the solar wind density. All this indicate arrival of the solar wind from the positive polarity coronal hole. However, only small equatorial unipolar region of positive polarity was observed at the central meridian on June 08 and June 09, and no prominent positive polarity coronal holes were observed. Presently the solar wind speed is about 460 km/s and the interplanetary magnetic field magnitude is about 4 nT. The solar wind originating from the large extension of the southern polar coronal hole can be expected at Earth in the early morning of June 15. During last 24 hours the geomagnetic conditions were at the quiet to unsettled We expect such geomagnetic conditions to persist in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 017, sur la base de 22 stations.

Indices solaires pour 12 Jun 2021

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	078
AK Chambon La Forêt	016
AK Wingst	015
Ap estimé	013
Nombre international de taches solaires estimé	007 - Basé sur 30 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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