Viewing archive of Friday, 4 October 2019

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2019 Oct 04 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
04 Oct 2019	068	014
05 Oct 2019	068	013
06 Oct 2019	068	007

Bulletin

Solar activity was at very low levels. The Sun was spotless. 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 varied between mostly 420 and 360 km/s, ending the period near 380 km/s (ACE). On 4 October around 05:30UT, the Earth crossed a sector boundary (SBC), with the interplanetary magnetic field (phi angle) switching from a predominantly positive direction (away from the Sun) to a predominantly negative sector (towards the Sun). Bz varied between -3 and +3 nT until the SBC, when it briefly dipped to -10 nT (05:30UT), then gradually increasing to values around +8 nT by 08:00UT and remaining variable afterwards. Both Kp and K Dourbes recorded quiet to unsettled geomagnetic conditions.

Geomagnetic activity is expected to remain at quiet to unsettled levels with a small chance on an isolated active interval in response to the wind stream associated with the patchy negative polarity coronal hole.

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

Solar indices for 03 Oct 2019

Wolf number Catania	///
10cm solar flux	068
AK Chambon La Forêt	008
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	000 - Based on 23 stations

Noticeable events summary

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

All times in UTC

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