Het archief bekijken van woensdag 29 april 2015

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2015 Apr 29 1230 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

Active conditions expected (A>=20 or K=4)

Proton Flux monitor

Quiet

	10cm flux	Ap
29 Apr 2015	100	008
30 Apr 2015	105	016
01 May 2015	105	008

Bulletin

The active regions are currently stable or decaying, except for a new developing small sunspot group Catania 48. No flares occurred during the past period. SDO/AIA and H-alpha GONG images indicate a few filament eruptions on April 28 in the Eastern hemisphere. The eruption of the extended filament, which was stretching from S05E10 to N40E80, started around 11:00 UT. An associated partial halo CME was detected in SOHO/LASCO images, with first measurement at 14:29 UT. The CME is mainly propagating to the North-East of the Sun-Earth line, with an estimated projected speed of 361 km/s (CACTus estimate). At most a glancing blow will arrive at Earth on May 2 at the end of the UT day. Another faint, asymmetric CME was observed in SOHO/LASCO-C2, with first measurement at 2:48 UT on April 29, which is perceived as a backside event. There is a limited chance (20%) for C-class flares during the next 24 hours. The Interplanetary Magnetic Field magnitude is fluctuating between 0 and 8 nT, while the solar wind speed obtains values between 280 and 360 km/s. Quiet to unsettled (local K=0 to 3 at Dourbes) geomagnetic conditions were observed and are largely expected to remain so. There is some chance for a few time slots of active (K=4) to minor storm (K=5) conditions, due to an expected flow from a positive polarity coronal hole on April 30.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 022, gebaseerd op 14 stations.

Zon indexen voor 28 Apr 2015

Wolfgetal Catania	061
10cm zonneflux	108
AK Chambon La Forêt	009
AK Wingst	007
Geschatte Ap	006
Geschat internationaal zonnevlekkengetal	032 - Gebaseerd op 23 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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