Viewing archive of Saturday, 7 October 2017

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2017 Oct 07 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
07 Oct 2017	081	005
08 Oct 2017	078	003
09 Oct 2017	075	003

Bulletin

Solar activity was at very low levels. NOAA 2683 (Catania 57) produced all of the low-level B-class flaring during the period, a B9.8 flare peaking on 06 October at 16:34UT being the strongest. It was also the source of a Long Duration B4.6 flare peaking at 00:28UT. Eruptive activity to the north and northwest of NOAA 2682 (Catania 56; now beyond the Sun's west limb) resulted in 2 coronal mass ejections (CMEs) observed by SOHO/LASCO C2 at resp. 09:12UT and 12:36UT on 06 October. None of the observed CMEs had an earth-directed component. The greater than 10 MeV proton flux was at nominal levels.

Quiet flaring conditions are expected, with a small chance on an isolated C-class flare.

Solar wind was enhanced, probably influenced by the weak particle stream from the small negative equatorial coronal hole (CH). Solar wind speed reached a maximum speed around 470 km/s (DSCOVR) at the beginning of the period, gradually declining to its current values near 410 km/s. Bz oscillated between -5 and +6 nT. The interplanetary magnetic field was mostly directed towards the Sun. The extension of a positive polar CH started its transit of the Central Meridian early on 07 October and may influence the earth environment around 10-11 October.

The geomagnetic field was at quiet levels. Quiet to unsettled conditions are expected, with a small chance on an isolated active interval.

Today's estimated international sunspot number (ISN): 012, based on 12 stations.

Solar indices for 06 Oct 2017

Wolf number Catania	026
10cm solar flux	084
AK Chambon La Forêt	012
AK Wingst	010
Estimated Ap	009
Estimated international sunspot number	025 - Based on 33 stations

Noticeable events summary

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

All times in UTC

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