Affichage des archives de dimanche, 18 juin 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Jun 18 1246 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 Jun 2017	075	019
19 Jun 2017	074	019
20 Jun 2017	073	008

Bulletin

Solar activity remains to be low with only one B-class flare reported in the last 24 hours. The B2.5 flare which originated from the Catania sunspot group 33 (NOAA AR 2663) peaked at 09:21 UT on June 18. We might expect isolated B-class flares in the coming hours. No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

Starting from about midday of June 17, the solar wind speed began to increase simultaneously with the temperature, and with the density decrease indicating arrival of the fast solar wind associated with two large coronal holes (one on the north and one on the south solar hemisphere) which reached central meridian in the evening of June 14. Although it is difficult to distinguish which of the two coronal holes is associated with present increase of the solar wind speed, it seems more probably that this is the coronal hole on the north solar hemisphere. The solar wind speed is about 590 km/s and the interplanetary magnetic field magnitude is 4nT. The geomagnetic conditions are presently quiet to unsettled, we expect unsettled to active geomagnetic conditions in the coming hours.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 031, sur la base de 22 stations.

Indices solaires pour 17 Jun 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	075
AK Chambon La Forêt	025
AK Wingst	021
Ap estimé	020
Nombre international de taches solaires estimé	033 - Basé sur 29 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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