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Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2017 May 28 1458 UTC

Prévisions SIDC

Éruptions solaires

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

Géomagnétisme

Moderate (ISES: Major) magstorm expected (A>=50 or K=6)

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
28 May 2017	084	066
29 May 2017	085	015
30 May 2017	086	009

Bulletin

Over the past 24 hours solar activity has increased. There have been four B-flares flares originated at NOAA AR 2659 (McIntosh:Dai; Mag.Type:Beta). The biggest flare B9.2 peaked yesterday (27-Mar-2017) at 18:30 UT. No Earth-directed CMEs have been detected over the past 24 hours. Solar electron and proton fluxes have remained at background levels over the past 24 hours. NOAA AR 2659 is expected to produce more B-class and C-class flares over the next 24 hours.

Solar wind speed was fluctuating around 300 km/s (DSCOVR) until 14:50 UT yesterday when a small shock was observed in the solar wind due to the arrival of the 23-May-2017 coronal mass ejection. Initially, solar wind speed abruptly increased from 303 km/s to 385 km/s and density increased from 4.6 to 70p/cm3.

The Total Interplanetary Magnetic Field (IMF) strength Bt jumped from 2.5 to 10 nT, while the Bz component jumped to -8.5 nT. Later on yesterday, Bt reached a maximum of 22.30 nT at 22:30 UT and Bz component reached -20.5 nT value. Then Bt started to decrease gradually (till 16.5 nT), while Bz slowly returned to low values (-3.5 nT) being strongly negative. Solar wind speed is currently (28-May-2017 October, 12:30 UT) below 400 km/s.

Kp index reached moderate storm levels (Kp=6) from 21 UT (2017-05-27) to 03 UT (2017-05-28, today). During 03-06 UT, today Kp reached major storm levels (Kp=7) and during 06-12 UT again moderate and minor storm levels (Kp=6, Kp=5). Local K index at Dourbes was mostly at minor to major storming levels (K=5,4,5,6,7,5) from 21 UT (2017-05-27) to 12 UT (2017-05-28, today).

Total IMF strength is expected to remain at high levels tomorrow, and Bz component is not expected to become strongly negative. Solar Wind speed is expected to remain below 400 km/s. Therefore geomagnetic environment is expected to remain most probably at active conditions (Kp=4) for the next two days. However, isolated minor storming episodes (Kp=5) are still possible.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 022, sur la base de 26 stations.

Indices solaires pour 27 May 2017

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	082
AK Chambon La Forêt	045
AK Wingst	013
Ap estimé	017
Nombre international de taches solaires estimé	024 - Basé sur 31 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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