Affichage des archives de samedi, 25 février 2017

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 Feb 25 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
25 Feb 2017	082	023
26 Feb 2017	082	017
27 Feb 2017	081	010

Bulletin

Solar activity was very quiet with no significant flaring. NOAA region 2638 (Catania group 96) slightly decayed while the new Catania group 97 (NOAA 2639) remained a simple alpha region. No C flares are expected on the coming days. A Westbound CME with angular width around 110 degrees is visible in SoHO/LASCO coronagraph data from 22:12 UT onwards but is judged to be a backside event. Proton flux values are at background levels and expected to remain so.

Solar wind parameters indicated the continued but slowly declining influence of the high speed stream. Solar wind speed slowly declined from around 600 km/s to close to 500 km/s. Total magnetic field was at nominal 3-5nT levels with Bz variable. Solar wind will initially remain enhanced but continue its decline towards nominal conditions over the next days. Geomagnetic conditions declined from active at the start of the period (NOAA Kp 4) to quiet to unsettled throughout the rest of the period (local K Dourbes 1-3 and NOAA Kp 2-3). Geomagnetic conditions are expected to be quiet to unsettled with an active period initially still possible.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 032, sur la base de 16 stations.

Indices solaires pour 24 Feb 2017

Nombre de Wolf, observé par Catania	054
Flux solaire à 10 cm	082
AK Chambon La Forêt	022
AK Wingst	020
Ap estimé	020
Nombre international de taches solaires estimé	022 - Basé sur 30 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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