Affichage des archives de samedi, 26 octobre 2019

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2019 Oct 26 1247 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
26 Oct 2019	067	023
27 Oct 2019	067	013
28 Oct 2019	067	007

Bulletin

Solar X ray flux remained below B level throughout the period. There are no active regions on disk and X-ray flux is expected to remain at background levels.

Form around 9:24UT yesterday October 25 onwards a faint slow CME front is visible along the southern Solar limb in SoHO/LASCO C2 coronagraph images. It is not believed to be related to the filament eruption reported yesterday and its origin remains unclear. In STEREO A COR2 data a corresponding CME is visible from around 6:54 UT onward, directed straight West as seen from STEREO location. Combining these data it seems likely that the CME is Earthbound with an expected arrival time around midnight October 29/30. No other Earth-directed CME's were detected in coronagraph images.

Solar high energy proton fluxes were at background levels and are expected to remain so.

Solar wind speed increased at the start of the period to around 670 km/s before starting a slow gradual decline to current values of 600 km/s. Total magnetic field was mostly in the 4-6nT range but recently increased to around 10nT. Bz was variable over the period but tended to be negative this morning with values down to -6nT and -8.5nT more recently. The phi angle was firmly in the positive sector. Solar wind is expected to slowly decline over the next 24-48 hours as the high speed stream subsides.

Geomagnetic conditions were quiet to active (NOAA Kp 3-4, local K Dourbes 2-4) with just recently a minor storming episode (NOAA Kp 5 for the 9-12UT period). Active geomagnetic conditions are likely over the next 24-48 hours before returning to unsettled conditions. Initially, isolated periods of minor geomagnetic storms are still possible.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 22 stations.

Indices solaires pour 25 Oct 2019

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	069
AK Chambon La Forêt	031
AK Wingst	021
Ap estimé	026
Nombre international de taches solaires estimé	000 - Basé sur 24 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

<< Aller à l'aperçu quotidien