Перегляд архіву пʼятниця, 30 червня 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2017 Jun 30 1230 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 Jun 2017	072	003
01 Jul 2017	071	005
02 Jul 2017	071	008

Bulletin

Solar activity was at very low levels during the period. NOAA 2664 decayed further and was quiet. No earth-directed CMEs were observed in available coronagraphic imagery. The greater than 10MeV proton flux was at nominal levels.

Quiet flaring conditions are expected.

Solar wind speed gradually declined from 430 km/s to 340 km/s. Bz was relatively stable between -2 and +2 nT. The interplanetary magnetic field was mostly directed away from the Sun. The first of two small negative equatorial coronal holes (CH) is about to start transiting the central meridian.

The geomagnetic field was at quiet to unsettled levels, and is expected to remain so. A glancing blow from the 28 June CME is possible late on 2 or on 3 July, likely followed by the particle stream from the small negative CH. This may result in active geomagnetic conditions, with a chance on a minor storming episode.

Today's estimated international sunspot number (ISN): 011, based on 23 stations.

Solar indices for 29 Jun 2017

Wolf number Catania	014
10cm solar flux	072
AK Chambon La Forêt	009
AK Wingst	006
Estimated Ap	005
Estimated international sunspot number	013 - Based on 21 stations

Noticeable events summary

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

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