Affichage des archives de dimanche, 9 juin 2019

Bulletin quotidien sur l'activité solaire et géomagnétique du SIDC

Publié: 2019 Jun 09 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
09 Jun 2019	069	010
10 Jun 2019	068	007
11 Jun 2019	069	013

Bulletin

Solar activity has been quiet over the past 24 hours. The X-ray flux remained at background levels, and the visible solar disc is spotless. EUV imagery reveals a simple magnetic structure near the central meridian, but appears stable in magnetogram observations. Solar activity is expected to remain at low levels for the next 24 hours. A small filament eruption was seen at approximately 00:00 UT yesterday (8-Jun-2019), near solar disk centre, in SDO AIA 304 imagery, and a small associated eruption seen in STEREO COR Coronagraph imagery, with the main body of the CME travelling South of the Sun-Earth line with a velocity of 390 km/s. The CME is expected to hit the Earth system on 12-Jun-2019 at around 10:00 UT +/-12 hours. There is currently a low latitude extension of a northern coronal hole, which may increase solar wind speeds at Earth in a couple of days. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so. The solar wind speed slowly increased from 310 to 470 km/s over the past 24 hours, but is now starting to decline. The total magnetic field strength has fluctuated between 4.0 and 19.0 nT, peaking at 15:00 UT yesterday. The Bz component fluctuated around 0 nT, between -17.0 and 15.0 nT. The enhanced magnetic field strength was created by a small CME, observed in STEREO imagery on 06-Jun-2019. Geomagnetic conditions fluctuated between Kp index 2-5 (NOAA) and local K index 1-6 (Dourbes) over the past 24 hours. Geomagnetic conditions reached moderate storm levels at around 18:00 UT yesterday (8-Jun-2019), the enhancement was created by the arrival of the aforementioned CME but was possibly enhanced further by a HSS associated with a small low latitude corona hole. The conditions have abated and are expected to return and remain at background levels, however the small eruption observed yesterday may enhance solar wind conditions on 12-Jun-2019 and the low latitude extension of a northern coronal hole may enhance solar wind speeds in a couple of days. Geomagnetic conditions are expected to be quiet with a small possibility of short active conditions.

Estimation du nombre international de taches solaires (ISN) pour aujourd'hui : 000, sur la base de 19 stations.

Indices solaires pour 08 Jun 2019

Nombre de Wolf, observé par Catania	///
Flux solaire à 10 cm	068
AK Chambon La Forêt	034
AK Wingst	026
Ap estimé	025
Nombre international de taches solaires estimé	000 - Basé sur 25 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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