Affichage des archives de vendredi, 7 septembre 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 Sep 07 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
07 Sep 2018	067	011
08 Sep 2018	067	010
09 Sep 2018	067	006

Bulletin

Solar activity was at very low levels. The Sun remained spotless. No earth-directed coronal mass ejections (CMEs) were observed in the available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels. A trans-equatorial extension of the positive polarity coronal hole (CH) at the Sun's north pole has started its transit of the Central Meridian early on 7 September.

Solar activity is expected to remain at very low levels.

Solar wind was steady at nominal values, until the arrival of the co- rotating interaction region (CIR) and wind stream from the negative polarity CH. The CIR arrived around 19:30UT, with solar wind density increasing from about 5 to 24 particles/cm3 by midnight, and the interplanetary magnetic field changing direction from mostly away to mostly towards the Sun. Solar wind speed started to increase from 02:30UT onwards, reaching a maximum near 510 km/s by 08UT, and is steady since then (DSCOVR). Bz varied between -4 and +4 nT, being mostly positive, and with a strong positive episode near +10 nT from 04UT till 07UT, with little interruption.

Due to the predominately positive Bz, mostly quiet geomagnetic conditions were observed. Quiet to unsettled geomagnetic conditions are expected, with a decreasing chance on an active episode as the CH wind stream is passing by.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 24 stations.

Indices solaires pour 06 Sep 2018

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	067
AK Chambon La Forêt	010
AK Wingst	005
Ap estimé	004
Nombre international de taches solaires estimé	000 - Basé sur 26 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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