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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 27 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
27 Oct 2017	077	007
28 Oct 2017	077	007
29 Oct 2017	077	007

Bulletin

Quiet solar conditions were reported with the X-ray flux seeing only a low B1.8 class flare peaking at 00:44UT from Catania group 61 (NOAA region 2686). Both active regions on disk are relatively simple (Mag.Type: Alpha) and small. The X-ray flux is expected to remain below C level. Proton flux levels were at background values and are expected to remain so. No Earth directed CME's were recorded in coronagraph data.

Solar wind saw the decline of the coronal hole high speed stream influence, with solar wind velocity dropping steadily from near 575 km/s at the start of the period to around 450 km/s presently. At the start of the period total magnetic field was around 6.5nT with a prolonged period of negative values of the Bz component (-5nT). Afterwards total magnetic field was at a nominal 5nT level with a variable Bz. The magnetic field phi angle indicated predominantly connection to a positive sector. Solar wind conditions should continue to be at nominal levels. Some active geomagnetic conditions were recorded at the start of the period (both local K Dourbes and NOAA Kp 4) easing to quiet to unsettled conditions for the remainder of the period (local K Dourbes 1-2 and NOAA Kp 1-3). Quiet to unsettled geomagnetic conditions are expected over the next days.

Today's estimated international sunspot number (ISN): 024, based on 21 stations.

Solar indices for 26 Oct 2017

Wolf number Catania	024
10cm solar flux	077
AK Chambon La Forêt	027
AK Wingst	020
Estimated Ap	021
Estimated international sunspot number	024 - Based on 21 stations

Noticeable events summary

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

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