Viewing archive of Wednesday, 7 August 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Aug 07 1231 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
07 Aug 2019	068	009
08 Aug 2019	067	005
09 Aug 2019	067	004

Bulletin

Solar activity was at very low levels. Small sunspot region NOAA 2747 developed during the period (N06E10; McIntosh class: Axx; MtWilson class: Alpha), but had almost decayed by noon on 7 August. No earth- directed coronal mass ejections (CME) were observed. The greater than 10 MeV proton flux was at nominal values. An irregular shaped negative polarity coronal hole is transiting the central meridian.

Solar activity is expected to remain at very low levels.

The earth environment remained under the influence of the high-speed stream (HSS) of the positive polarity coronal hole. Solar wind speed declined from values near 650 km/s to about 500 km/s by the end of the period (ACE). Bz varied between -4 and + 3 nT. The interplanetary magnetic field (phi angle) was mostly directed away from the Sun (positive sector).

Geomagnetic activity was at quiet to unsettled levels, and is expected to continue under the waning influence of the HSS.

Today's estimated international sunspot number (ISN): 011, based on 14 stations.

Solar indices for 06 Aug 2019

Wolf number Catania	///
10cm solar flux	068
AK Chambon La Forêt	018
AK Wingst	013
Estimated Ap	012
Estimated international sunspot number	000 - Based on 27 stations

Noticeable events summary

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

All times in UTC

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