Affichage des archives de jeudi, 22 août 2013

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2013 Aug 22 1224 UTC

Prévisions SIDC

Éruptions solaires

Eruptive (C-class flares expected, probability >=50%)

Géomagnétisme

Active conditions expected (A>=20 or K=4)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
22 Aug 2013	125	016
23 Aug 2013	125	006
24 Aug 2013	128	026

Bulletin

A C4.2 flare on 22 August at 5h00 UT was the strongest event of the past 24 hours. The flare originated from NOAA AR 1818, which is currently located at the west limb. NOAA AR 1820 is the strongest candidate for further C-class flaring, given it's magnetic complexity. There is a slight chance for M-class flaring. No Earth directed CMEs were observed. Solar wind speed as observed by ACE has evolved from about 460 km/s to 520 km/s with a maximum of 580 km/s. The magnitude of the interplanetary magnetic field is varying between 5 and 10 nT, with a fluctuating Bz component between -5 and +5 nT. Current geomagnetic conditions are unsettled to active; with both K at Dourbes and estimated NOAA Kp making excursions to K=4. Geomagnetic activity is expected to return to quiet levels in the next few hours. A new increase to active levels is predicted on 23 August in the afternoon due to the arrival of the CME of 20 August. On 24 and 25 August we expect effects of the CME of 21 August, combined with some minor influence of a fast speed stream from two small coronal holes, one in the southern hemisphere that just past the central meridian and another low latitude in the northern hemisphere currently at a central position.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 095, sur la base de 13 stations.

Indices solaires pour 21 Aug 2013

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	130
AK Chambon La Forêt	037
AK Wingst	024
Ap estimé	023
Nombre international de taches solaires estimé	100 - Basé sur 22 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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