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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Oct 21 1235 UTC

SIDC Forecast

Brillamenti solari

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Protoni solari

Quiet

	10cm flux	Ap
21 Oct 2019	066	015
22 Oct 2019	066	018
23 Oct 2019	066	007

Bulletin

Solar X ray flux remained below B level throughout the period. There are no active regions on disk and X-ray flux is expected to remain at background levels.

There were no Earth-directed CME's detected in coronagraph images.

Solar high energy proton fluxes were at background levels and are expected to remain so.

A recurrent equatorial positive polarity coronal hole is about to rotate across the central meridian and is expected to influence solar wind parameters later this week.

Solar wind conditions were nominal. Solar wind speed was between 320-360 km/s and total magnetic field was below 6.5nT with a variable Bz. The magnetic field phi angle switched to the negative sector after 18UT but was unstable with regular excursions back into the positive sector. Solar wind conditions are expected to become slightly enhanced under the elevated solar wind speeds associated to a negative polarity coronal hole.

Geomagnetic conditions were quiet to unsettled (NOAA Kp 1-3 and local K Dourbes 0-3). Geomagnetic conditions are expected to be unsettled with active periods possible over the next 24-48 hours under the expected enhanced Solar wind conditions.

Today's estimated international sunspot number (ISN): 000, based on 11 stations.

Solar indices for 20 Oct 2019

Wolf number Catania	///
10cm solar flux	065
AK Chambon La Forêt	012
AK Wingst	005
Estimated Ap	004
Estimated international sunspot number	000 - Based on 16 stations

Noticeable events summary

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

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