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Daily bulletin on solar and geomagnetic activity from the SIDC

Випущено: 2018 Oct 21 1230 UTC

SIDC Forecast

Сонячні спалахи

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

Geomagnetism

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

Сонячні протони

Quiet

	10cm flux	Ap
21 Oct 2018	070	013
22 Oct 2018	069	001
23 Oct 2018	068	001

Bulletin

There are no active regions visible on the solar disk. No C-class flares in past 24 h. Solar activity is expected to remain at low levels.

No Earth directed Coronal Mass Ejections (CMEs) have been detected. Solar protons have remained at background levels over the past 24 hours.

The solar wind speed is at 330 km/s with interplanetary magnetic fields of 8 nT. Geomagnetic conditions have been quiet. A sector boundary crossing occurred around 07:00 UT, the interplanetary magnetic field polarity changed from negative to positive. The solar wind speed started increasing since then, marking the late arrival of the high speed solar wind stream associated with the low latitudinal extension of the northern polar coronal hole coming to Earth. The effect is expected to be weak, producing up to active periods. A patchy negative polarity coronal hole traversed central meridian yesterday, its associated high speed stream will affect the Earth around October 24.

Today's estimated international sunspot number (ISN): 000, based on 17 stations.

Solar indices for 20 Oct 2018

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	005
AK Wingst	002
Estimated Ap	001
Estimated international sunspot number	000 - Based on 28 stations

Noticeable events summary

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

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