Affichage des archives de vendredi, 28 août 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Aug 28 1230 UTC

Prévisions SIDC

Éruptions solaires

M-class flares expected (probability >=50%)

Géomagnétisme

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

Moniteur de Flux de Proton

Warning condition (activity levels expected to increase, but no numeric forecast given)

	Flux de 10 cm	Ap
28 Aug 2015	115	041
29 Aug 2015	115	021
30 Aug 2015	110	017

Bulletin

Solar flaring activity was low with AR 2403 producing a number of C flares this morning. The largest one peaked at 2:51UT at C8 level. The new region in the South-East was numbered 2405. Larger flaring at M level from region 2403 remains fairly likely. The associated warning condition for proton events is maintained. No Earth-directed CME's were recorded in coronagraph data. While solar wind speed continued to drop from around 350 km/s to around 335 km/s, total magnetic field remained elevated to levels in the 10-15nT range with Bz mainly negative and extended periods of pronounced negative values down to -13nT. Yesterday afternoon saw the anticipated sector boundary crossing into the towards sector. The negative Bz values caused unsettled to moderate geomagnetic storm conditions (local K Dourbes 3-6, NOAA Kp 4-6). Solar wind speed is expected to rise under the influence of a high speed stream from a negative polarity coronal hole. Elevated solar wind conditions are hence expected to continue over the first days before subsiding. Consequently, unsettled to minor geomagnetic storm conditions are expected.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 043, sur la base de 18 stations.

Indices solaires pour 27 Aug 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	110
AK Chambon La Forêt	056
AK Wingst	041
Ap estimé	047
Nombre international de taches solaires estimé	055 - Basé sur 18 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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