Affichage des archives de lundi, 18 décembre 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Dec 18 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
18 Dec 2017	070	026
19 Dec 2017	070	022
20 Dec 2017	070	019

Bulletin

The Sun is spotless and no significant flaring activity was recorded. No flaring activity is expected over the next 24 hours. There were no CMEs observed in coronagraph data. The proton flux values are at background levels and are expected to remain so. An elongated negative polarity equatorial coronal hole started transiting the central meridian. It may influence solar wind from November 20 onwards.

Solar wind is under the expected influence of a positive polarity coronal hole high speed stream. Since just after the start of the reporting period solar wind speed has been between 575 and 650 km/s. Total magnetic field was between 5-10nT with negative peaks of Bz down to -7nT. Based on Stereo A Solar wind measurements, the influence of the high speed stream is expected to decay over the next 24 hours. On December 20 we may see some minor influence of the December 15 CME and later on a renewed increase in Solar wind conditions due to the negative polarity equatorial coronal hole currently transiting the central meridian.

Geomagnetic conditions have seen a minor storm period in the afternoon of December 17 with both NOAA Kp and local K Dourbes reaching K=5. Afterwards, quiet to active conditions were reported (NOAA Kp 3-4 and local K Dourbes 2-4). With Solar wind speed still high, periods of active geomagnetic conditions should be anticipated but should become less likely over the next 24-48 hours. Renewed increases of geomagnetic activity may follow starting December 20 caused by the possible December 15 CME influence and later increased Solar wind conditions due to the negative polarity equatorial coronal hole currently transiting the central meridian.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 14 stations.

Indices solaires pour 17 Dec 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	071
AK Chambon La Forêt	044
AK Wingst	026
Ap estimé	028
Nombre international de taches solaires estimé	000 - Basé sur 19 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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