Viewing archive of Sunday, 11 August 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Aug 11 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
11 Aug 2019	067	009
12 Aug 2019	067	010
13 Aug 2019	067	006

Bulletin

Solar activity was at very low levels. The Sun was spotless. No earth-directed coronal mass ejections (CME) were observed during the period. The greater than 10 MeV proton flux was at nominal values.

Solar activity is expected to remain at very low levels.

Solar wind speed decreased from values near 500 km/s to around 430 km/s (ACE) by 07UT. Bz varied between -4 and +3 nT. The interplanetary magnetic field (phi angle) was predominately oriented away from the Sun (positive sector). From 09:03UT until about 11:30UT, the phi angle was directed towards the Sun. This period was associated with slightly increased wind speeds between 450 and 480 km/s, and Bz values nearly continuously near -4nT.

Quiet to unsettled geomagnetic conditions were observed. The wind stream from an irregular shaped negative polarity coronal hole is expected to arrive on 11 August, which may result in mostly unsettled geomagnetic conditions continuing into 12 August, with an isolated active episode not excluded.

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

Solar indices for 10 Aug 2019

Wolf number Catania	///
10cm solar flux	067
AK Chambon La Forêt	013
AK Wingst	010
Estimated Ap	010
Estimated international sunspot number	000 - Based on 26 stations

Noticeable events summary

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

All times in UTC

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