Affichage des archives de mercredi, 27 février 2019

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2019 Feb 27 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
27 Feb 2019	071	012
28 Feb 2019	070	021
01 Mar 2019	071	012

Bulletin

Over the past 24 hours solar activity has been low. No significant flares have been recorded. No significant Active Regions (AR) or filament channels are present on the solar disk. The greater-than 10 MeV proton flux was at nominal values. A negative polarity equatorial coronal hole (CH) has reached W55S15.

Solar activity is expected to remain at low levels.

The solar wind speed has fluctuated between 300 and 340 km/s (DSCOVR) over the past 24 hours, with a small increase experienced over the past 6 hours. The total magnetic field strength has fluctuated between 3 nT and 7 nT (DSCOVR). The Bz component fluctuated around 0 nT, ranging between -6 and +3 nT, but has been mainly negative for the past 3 hours. Geomagnetic conditions ranged between Kp index 0-1 (NOAA) and local K index 0-2 (Dourbes) over the past 24 hours. A negative polarity coronal hole is currently positioned near W55S15 in the Western hemisphere of the Sun and the associated co-rotating interaction region (CIR) and high-speed stream (HSS) may enhance solar wind speeds later today and for the next few days, the increasing negative Bz and enhancements in solar wind speed over the past few hours may indicate the arrival of the CIR/HSS. As a consequence geomagnetic activity is expected to reach to active conditions later today, and possibly persist for the next few days.

Geomagnetic conditions are expected to be unsettled to active from later today.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 20 stations.

Indices solaires pour 26 Feb 2019

Nombre de Wolf, observé par Catania	000
Flux solaire à 10 cm	071
AK Chambon La Forêt	005
AK Wingst	002
Ap estimé	002
Nombre international de taches solaires estimé	000 - Basé sur 34 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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