Перегляд архіву четвер, 24 квітня 2014

Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2014 Apr 24 1220 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
24 Apr 2014	132	006
25 Apr 2014	129	005
26 Apr 2014	127	005

Bulletin

Six low-level C-class flares were recorded over the last 24 hours, mostly produced by active region NOAA 2035 which was also the source of the strongest event (C5 peaking at 13:06UT). NOAA 2044 was the only other region producing a flare (C3 peaking at 23:53UT). Imagery from the SOHO and STEREO coronagraphs indicate that the associated CMEs are directed away from the Earth, with any glancing blow not expected to affect the geomagnetic field significantly. There's still a chance on a C-class flare. Dourbes recorded a brief period of active geomagnetic conditions (00:00-03:00UT; K=4; Kp=3). The source of this disturbance is uncertain, with no obvious signature in the solar wind (ACE). For the remainder of the period, quiet geomagnetic conditions were observed. Solar wind speed oscillated between 400 and 450km/s, with Bz varying between -6 and +5nT. A small equatorial coronal hole passed the central meridian last night. The geomagnetic field may be impacted starting around 27 April. Geomagnetic conditions are expected to be quiet.

Today's estimated international sunspot number (ISN): 052, based on 12 stations.

Solar indices for 23 Apr 2014

Wolf number Catania	///
10cm solar flux	136
AK Chambon La Forêt	015
AK Wingst	008
Estimated Ap	006
Estimated international sunspot number	064 - Based on 24 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

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