Viewing archive of Saturday, 4 August 2018

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2018 Aug 04 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
04 Aug 2018	070	006
05 Aug 2018	071	013
06 Aug 2018	071	008

Bulletin

Solar activity was at very low levels. The earth-facing solar hemisphere was devoid of sunspots. No earth-directed coronal mass ejections (CMEs) were observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal levels.

Solar activity is expected to remain at very low levels.

Solar wind speed varied between 370 and 410 km/s (DSCOVR). Bz was near neutral values, except for the 22UT-04UT interval when it varied between -5 and + 4nT. The interplanetary magnetic field was predominately directed away from the Sun (positive sector). Mostly quiet geomagnetic conditions were observed, with a few unsettled episodes in Dourbes.

Geomagnetic activity is expected to continue at quiet to unsettled levels. A weak wind stream associated with a small negative polarity equatorial coronal hole (CH) may start influencing the earth environment late on 4 or on 5 August. Another wind stream enhancement associated with a small positive polarity equatorial CH may start influencing the earth environment late on 6 or on 7 August. In response to these wind streams, an isolated active episode is possible.

Today's estimated international sunspot number (ISN): 000, based on 19 stations.

Solar indices for 03 Aug 2018

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	013
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	000 - Based on 29 stations

Noticeable events summary

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

All times in UTC

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