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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Sep 22 1230 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
22 Sep 2019	068	007
23 Sep 2019	068	013
24 Sep 2019	067	021

Bulletin

Solar X ray flux remained below B level throughout the period. The Solar disk is spotless and X-ray flux is expected to remain at or below background levels.

There were no Earth-directed CMEs observed in coronagraph data.

Proton levels were at background values and are expected to remain so.

Solar wind conditions were near nominal with Solar wind speed around 350 km/s and total magnetic field in the 4-6nT range. The Bz component evolved from negative to positive over the period and the magnetic field phi angle was persistently in the positive sector. Solar wind conditions are expected to remain nominal in the next 24 hours and then become enhanced by late September 23 due to the high speed stream from an equatorial coronal hole. Solar wind speed is then expected to reach over 500 km/s.

Geomagnetic conditions were quiet (NOAA Kp 0-2). Geomagnetic conditions are expected to remain quiet for the next 24 hours, and then increasing by late September 23 to unsettled conditions with also some active periods due to the high speed stream solar wind enhancements.

Today's estimated international sunspot number (ISN): 000, based on 19 stations.

Solar indices for 21 Sep 2019

Wolf number Catania	///
10cm solar flux	068
AK Chambon La Forêt	013
AK Wingst	006
Estimated Ap	007
Estimated international sunspot number	000 - Based on 31 stations

Noticeable events summary

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

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