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Tägliches Bulletin zur solaren und geomagnetischen Aktivität des SIDC

Ausgestellt: 2014 Apr 02 1244 UTC

Vorhersage des SIDC

Sonneneruptionen

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

Geomagnetismus

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

Sonnenprotonen

Quiet

	10cm Fluss	Ap
02 Apr 2014	153	022
03 Apr 2014	154	011
04 Apr 2014	154	007

Bulletin

Solar flaring activity was limited to about a dozen of low level C class flares. Most of them originated from NOAA AR 2026, with the strongest one peaking at 06:08 UT, April 2, at C3.5 level. Others originated from NOAA AR 2022, 2027, and 2029. The eruption of a filament located to the south-east of NOAA AR 2021, triggered a faint halo CME which was visible in LASCO COR 2 images from April 1, 16:48 UT onwards. The bulk of the CME was expelled in eastern direction and directed slightly south. CACTus software only detected multiple fragments of the event. The projected speed as estimated from Stereo B COR2 is about 300 km/s. Hence, the arrival of the perturbation can be expected around late April 4 and early April 6, probably only causing merely unsettled to active geomagnetic conditions. This halo CME was immediately followed by a faster partial halo CME, first visible in LASCO C2 images at 19:00 UT, April 1. In STEREO B COR2 the event is first visible at 19:25 UT. CACTus underestimated its angular width, which from manual detection is estimated to be around 160 degrees, with the main component directed in west southwest direction. It does not seem to be related to any front side activity and we therefore do not expect the CME to be geoeffective. However, since the event could neither be clearly related to any activity on the back side, the source of the CME remains yet undetermined. The solar wind speed is steady between 400 and 450 km/s with total field still around 5 nT. There are yet no signs of the expected arrival of the CMEs of March 28, 29, and 30. Unsettled conditions to minor storm levels can still be expected over the next days when/if these CMEs arrive.

Die heute international geschätzte Sonnenfleckenanzahl (ISN): 083, basierend auf 16 Stationen.

Solarindizes für den 01 Apr 2014

Wolf-Zahl Catania	109
10cm Solarflux	153
AK Chambon La Forêt	014
AK Wingst	005
Geschätzer Ap-Wert	006
Geschätzte internationale Sonnenfleckenzahl	074 - Basierend auf 25 Stationen

Zusammenfassung auffälliger Ereignisse

Zur Verfügung gestellt vom Solar Influences Data Analysis Center© - SIDC - Verarbeitet von SpaceWeatherLive

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