Affichage des archives de samedi, 5 mai 2018

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2018 May 05 1230 UTC

Prévisions SIDC

Éruptions solaires

Quiet conditions (<50% probability of C-class flares)

Géomagnétisme

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

Moniteur de Flux de Proton

Quiet

	Flux de 10 cm	Ap
05 May 2018	068	015
06 May 2018	069	052
07 May 2018	069	040

Bulletin

Solar activity was very low with X ray flux remaining below B level. Catania sunspot group 79 was shortlived while Catania sunspot group 80 was numbered NOAA 2708 (Beta; McIntosh Cro). Another region is rotating on the disk in the Northern hemisphere. The chance for any C class flares remains very low.

No Earth directed CMEs have been detected in coronagraph data.

The solar proton flux levels are at background values and are expected to remain so.

A shock was observed in the solar wind at 9:27UT with solar wind speed jumping from 340 to 370 km/s and total magnetic field from under 4nT to close to 7nT. Afterwards a further increase to a peak of near 12.5nT was observed. Bz became more volatile with a peak down to -9.5 nT. The shock is probably related to the upcoming interaction region and high speed stream from a negative polarity coronal hole although the magnetic field phi angle currently still indicates connection to a positive sector. Magnetic field is expected to remain elevated and perturbed and probably rising further. This will be followed by a further increase of the solar wind speed as the high speed stream sets in.

Geomagnetic conditions were quiet (local K Dourbes 1-2 and NOAA Kp 0-1). Geomagnetic conditions are likely to increase to active and minor geomagnetic storm levels with the passage of a sector boundary crossing and co-rotating interaction region in the next 24 hours. They will remain elevated as the high speed stream continues.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 014, sur la base de 21 stations.

Indices solaires pour 04 May 2018

Nombre de Wolf, observé par Catania	023
Flux solaire à 10 cm	068
AK Chambon La Forêt	007
AK Wingst	006
Ap estimé	004
Nombre international de taches solaires estimé	012 - Basé sur 23 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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