Affichage des archives de lundi, 18 mai 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 May 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 May 2015	114	018
19 May 2015	107	026
20 May 2015	100	010

Bulletin

Solar activity was low. A newly numbered region in the southeast (NOAA 2349) produced the only two C flares of the period (C1 peaking at 7:53UT and 8:21UT). In addition, a new region (NOAA 2350) emerged slightly to the northwest of NOAA 2349. With NOAA 2339 departing over the West limb, the regions on disk are fairly simple and unremarkable. Essentially quiet conditions are expected with a chance for isolated C flares. No earth directed CMEs have been observed. Solar wind speed was around 400 km/s. The total magnetic field saw an increase from around 5 nT to a peak of 15 nT (currently 11-12nT). The magnetic field increase is possibly associated with the compression region in front of the expected high speed stream or with the May 13 CME. Bz was initially mostly positive but is currently pronounced negative down to -12nT. Geomagnetic conditions were quiet to unsettled (NOAA Kp 1-2, local K Dourbes 1-3). A high speed stream from an equatorial positive polarity coronal hole is expected to influence solar wind over the coming days. Active geomagnetic conditions are possible in response.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 071, sur la base de 15 stations.

Indices solaires pour 17 May 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	120
AK Chambon La Forêt	009
AK Wingst	006
Ap estimé	006
Nombre international de taches solaires estimé	058 - Basé sur 25 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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