Перегляд архіву неділя, 30 квітня 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2017 Apr 30 1242 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

Quiet (A<20 and K<4)

Сонячні протони

Quiet

	10cm flux	Ap
30 Apr 2017	076	008
01 May 2017	075	006
02 May 2017	074	006

Bulletin

Solar activity is very low and only one B-class flare was reported during last 24 hours. The long duration B3.0 flare (peaking at 00:57 UT on April 30) originated from the Catania sunspot group 18 (NOAA AR 2653). The flare was associated with the on disc CME signatures, EIT wave and coronal dimming. Presently available coronagraph images show that associated CME had angular width of about 90 degrees and as such it is not very probable that it will arrive at the Earth. No Earth directed CMEs have been observed and the solar protons remained at background level in the past 24 hours.

The Earth is presently inside the slow solar wind with the speed of about 390 km/s, and the interplanetary magnetic field magnitude has the value of about 3nT. The geomagnetic conditions are quiet and we expect them to remain so in the coming hours.

As we expect flaring activity to be below the C-class level, quiet geomagnetic conditions and no particle events, we will issue the all quiet alert.

Today's estimated international sunspot number (ISN): 024, based on 21 stations.

Solar indices for 29 Apr 2017

Wolf number Catania	///
10cm solar flux	077
AK Chambon La Forêt	011
AK Wingst	008
Estimated Ap	008
Estimated international sunspot number	034 - Based on 32 stations

Noticeable events summary

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

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