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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 24 1230 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Minor storm expected (A>=30 or K=5)

Protoni solari

Quiet

	10cm flux	Ap
24 Oct 2017	078	026
25 Oct 2017	079	055
26 Oct 2017	080	040

Bulletin

Quiet solar conditions were reported with not a single flare occurring and the X-ray flux remained below B level. Both active regions on disk are relatively simple (McIntosh: Hax; Mag.Type: Alpha) and quiet. 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 remained initially nominal until a weak shock at 7:41UT occurred in the interplanetary Solar wind as measured at L1 by the DSCOVR spacecraft. Solar wind speed initially increased only slightly from around 360 km/s to around 380km/s with also a moderate increase in total magnetic field from around 4nT to 6.5nT. But this was followed by the transition into a positive polarity sector as indicated by the shift in phi angle around 10:30UT after which solar wind speed started a steady ascent to 450 km/s presently and total magnetic field reached up to 15nT. The Bz component of the magnetic field is variable but with some periods of sustained negative values down to -10nT. The perturbed conditions are a result of a high speed stream from the coronal hole in the northern hemisphere. Perturbed solar wind conditions are expected to continue with solar wind speed steadily increasing over the next 24-48 hours before starting to subside. Geomagnetic conditions were quiet to unsettled. Geomagnetic conditions are expected to become unsettled to active with also periods of minor geomagnetic storming expected over the next 24-48h.

Today's estimated international sunspot number (ISN): 023, based on 07 stations.

Solar indices for 23 Oct 2017

Wolf number Catania	024
10cm solar flux	078
AK Chambon La Forêt	007
AK Wingst	006
Estimated Ap	004
Estimated international sunspot number	024 - Based on 20 stations

Noticeable events summary

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

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