Viewing archive of Monday, 30 September 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Sep 30 1230 UTC

SIDC Forecast

Solar flares

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

Geomagnetism

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

Solar protons

Quiet

	10cm flux	Ap
30 Sep 2019	067	019
01 Oct 2019	067	016
02 Oct 2019	067	011

Bulletin

Solar activity was at very low levels. The Sun was spotless again. No earth-directed coronal mass ejections (CMEs) have been observed in available coronagraphic imagery. The greater than 10 MeV proton flux was at nominal values.

Solar activity is expected to remain at very low levels.

Solar wind speed declined from initial values around 530 km/s to 440 km/s at the end of the period (ACE). Bz was weakly but almost continuously negative with sustained values near -5 nT. These solar wind conditions resulted in some active geomagnetic intervals in both Kp and K Dourbes. The interplanetary magnetic field (phi angle) was mostly directed away from the Sun (positive sector).

Geomagnetic activity is expected to be mostly at quiet to unsettled levels, as the Earth remains under the gradually weakening influence from the coronal hole wind stream. There remains a chance on an active episode.

Today's estimated international sunspot number (ISN): 000, based on 25 stations.

Solar indices for 29 Sep 2019

Wolf number Catania	///
10cm solar flux	067
AK Chambon La Forêt	030
AK Wingst	014
Estimated Ap	016
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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