Affichage des archives de dimanche, 18 octobre 2015

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2015 Oct 18 1230 UTC

Prévisions SIDC

Éruptions solaires

M-class flares expected (probability >=50%)

Géomagnétisme

Minor storm expected (A>=30 or K=5)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
18 Oct 2015	119	031
19 Oct 2015	122	021
20 Oct 2015	125	021

Bulletin

Solar flaring intensified due to a new region currently rounding the southeast solar limb. This new sunspot group produced 6 C-class flares and 2 M1 flares, the latter peaking resp. at 20:23UT and 20:42UT. NOAA 2434 produced 3 low-level C-class flares, originating from the small delta north of the main spot. NOAA 2435 and NOAA 2436 produced one C1 flare each, while NOAA 2431 was quiet. No earth-directed coronal mass ejections have been observed.

Further M-class flaring is likely, in particular from NOAA 2434 and the new region at the southeast solar limb.

Around 22:00UT, solar wind speed started a gradual rise from around 350 km/s to its current values between 400 and 450 km/s. Bz was mostly negative, with persistent values around -5 nT between 15-21UT and a strong -11 nT during the 06-09UT interval. The direction of the interplanetary magnetic field (IMF) varied wildly. In response to the persistently negative Bz, Kp reached active levels during the 18-21UT and 06-09UT intervals. Kp and local K were at minor storming levels during the last interval of the period. A negative equatorial CH may affect the geomagnetic environment late around 21 October.

Mostly quiet to active geomagnetic conditions are expected, with a chance on another minor storming episode from the moderate speed stream.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 068, sur la base de 11 stations.

Indices solaires pour 17 Oct 2015

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	117
AK Chambon La Forêt	019
AK Wingst	013
Ap estimé	012
Nombre international de taches solaires estimé	071 - Basé sur 11 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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