Перегляд архіву четвер, 29 червня 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2017 Jun 29 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
29 Jun 2017	071	007
30 Jun 2017	070	006
01 Jul 2017	071	006

Bulletin

Solar activity was at very low levels during the period. Decaying sunspot region NOAA 2664 was the source of a long duration event (no x-ray flare reported, but x-ray flux was at B1 level from 13UT till 18UT) during the afternoon of 28 June. SDO EUV imagery indicated coronal dimming both to the north and south of this active region. CACTus detected the associated weak and slow (275-300 km/s) coronal mass ejection (CME) in LASCO/C2 difference images starting at 16:24UT, but as 2 separate CMEs. Though the bulk of this partial halo CME (about 170 degrees angular width) is directed to the southwest, a glancing blow cannot be excluded and may arrive around noon on 3 July (+/- 12 hours). No other 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 undulated between 460 and 420 km/s, with the maximum speeds observed during the 00-03UT interval. Bz fluctuated between -5 and +4 nT. The interplanetary magnetic field was directed away from the Sun.

The geomagnetic field was at quiet levels, and is expected to be quiet to unsettled for the next few days. The particle stream from a small equatorial coronal hole may briefly enhance geomagnetic conditions later today or tomorrow (30 June), with a small chance on an active episode. A glancing blow from the 28 June CME is possible on 3 July, but the geomagnetic impact is expected to be limited (active conditions at most).

Today's estimated international sunspot number (ISN): 012, based on 12 stations.

Solar indices for 28 Jun 2017

Wolf number Catania	///
10cm solar flux	072
AK Chambon La Forêt	007
AK Wingst	004
Estimated Ap	004
Estimated international sunspot number	017 - Based on 21 stations

Noticeable events summary

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

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