Viewing archive of Saturday, 21 July 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Jul 21 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
21 Jul 2018	070	008
22 Jul 2018	070	005
23 Jul 2018	069	006

Bulletin

Solar activity is extremely low without any flaring activity reported during last 24 hours. We do not expect any change of the activity 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 has increased and it presently amounts about 510 km/s. The maximum solar wind speed (about 550 km/s), during last 24 hours was reached at about 11:20 UT today. The interplanetary magnetic filed magnitude is presently about 8 nT. The patchy but rather extended equatorial coronal hole (possibly even connected with the southern polar coronal hole), has reached central meridian early this morning. The associated fast solar wind is expected at the Earth in the mid of the day on July 24. The geomagnetic conditions are presently unsettled to quiet and we expect such a geomagnetic conditions to persist in the coming hours.

Today's estimated international sunspot number (ISN): 000, based on 12 stations.

Solar indices for 20 Jul 2018

Wolf number Catania	000
10cm solar flux	071
AK Chambon La Forêt	015
AK Wingst	009
Estimated Ap	009
Estimated international sunspot number	000 - Based on 30 stations

Noticeable events summary

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

All times in UTC

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