Affichage des archives de dimanche, 19 février 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Feb 19 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
19 Feb 2017	080	019
20 Feb 2017	082	017
21 Feb 2017	082	015

Bulletin

In the past 24 hours, no C flares were observed. The X-ray background increased from about B1 to B3 level. Very low solar activity (no C flares) is expected in the next 24 hours, with a slight chance for a C flare. A filament eruption was observed west of NOAA AR 2636 in ground- based H alpha images and HeII AIA images around 5:20 UT on February 19. There were no signs of an associated CME in the available coronagraph images. The solar wind near Earth is under the influence of a high speed stream by a positive coronal hole. In the past 24 hours, solar wind speed measured by DSCOVR varied between about 480 and 620 km/s, with current values around 555 km/s. The magnitude of the Interplanetary Magnetic Field (IMF) varied between about 2 and 10 nT, with current values around 4 nT. There was a short interval between 21h and 22h UT on February 18 when Bz was below -5 nT, but this did not lead to higher than unsettled levels (K Dourbes = 3). Quiet to active geomagnetic conditions (K Dourbes between 1 and 4; NOAA Kp between 1 and 4) were registered in the past 24 hours. Due to the continued influence of the high speed stream, quiet to active geomagnetic levels (K Dourbes < 5) are expected on February 19, 20 and 21, with a slight chance for minor storm episodes (K Dourbes = 5) on February 19.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 021, sur la base de 16 stations.

Indices solaires pour 18 Feb 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	077
AK Chambon La Forêt	021
AK Wingst	020
Ap estimé	020
Nombre international de taches solaires estimé	012 - Basé sur 21 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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