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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2017 Oct 25 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
25 Oct 2017	079	041
26 Oct 2017	079	040
27 Oct 2017	079	021

Bulletin

Quiet solar conditions were reported with the X-ray flux touching only marginally into the B level. Both active regions on disk are relatively simple (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 speed increased further as expected under the influence of the coronal hole high speed stream. Speeds increased to values between 600-650kms after 20UT and remained at those values since. Total magnetic field was mostly in the 7-11nT range but presently steady at around 5.5 nT. Bz was variable but saw some periods of negative values down to -9nT. The phi angle was predominantly in the positive sector. Total magnetic field is expected to remain around nominal values while solar wind speed is expected to remain elevated over the next 24-48 hours. Geomagnetic conditions reached some periods of minor geomagnetic storming (Both NOAA Kp and local K Dourbes 5 for the 15-18UT period, while only NOAA Kp reaching 5 in the 6-9UT period). As solar wind speed remains elevated further minor geomagnetic storming episodes should be anticipated.

Today's estimated international sunspot number (ISN): 023, based on 16 stations.

Solar indices for 24 Oct 2017

Wolf number Catania	///
10cm solar flux	078
AK Chambon La Forêt	044
AK Wingst	028
Estimated Ap	026
Estimated international sunspot number	024 - Based on 15 stations

Noticeable events summary

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

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