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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2018 Jul 22 1230 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

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

Sluneční protony

Quiet

	10cm flux	Ap
22 Jul 2018	069	007
23 Jul 2018	069	007
24 Jul 2018	068	017

Bulletin

Solar activity remains to be low despite the appearance of the new active region NOAA AR 2716, which emerged during last 24 hours and is presently situated close to the center of the solar disc. We expect such a low flaring activity (without C-class flares), to persist in the coming hours. Coronagraph images do not show signatures of the Earth directed CMEs, and the solar protons are at the background level.

Solar wind speed presently amounts about 500 km/s. The maximum solar wind speed (about 580 km/s), during last 24 hours was reached at about 16:00 UT on July 21. The interplanetary magnetic filed magnitude is presently about 4 nT. The fast solar wind, associated with extended equatorial coronal hole which reached central meridian in the early morning of July 21, is expected at the Earth in the mid of the day on July 24. The arrival of the fast flow might induce active geomagnetic conditions late on July 24. The geomagnetic conditions are presently quiet to unsettled and we expect such a geomagnetic conditions to persist in the coming hours.

Today's estimated international sunspot number (ISN): 000, based on 21 stations.

Solar indices for 21 Jul 2018

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	016
AK Wingst	014
Estimated Ap	015
Estimated international sunspot number	000 - Based on 17 stations

Noticeable events summary

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

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