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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 May 21 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
21 May 2019	069	007
22 May 2019	068	007
23 May 2019	068	004

Bulletin

Over the past 24 hours solar activity has been low. The visible solar disc was spotless and the X-ray flux remained below B-class level. No Earth directed Coronal Mass Ejections (CMEs) have been detected. The greater than 10MeV proton flux remained at background levels over the past 24 hours. Solar activity is expected to remain low over the next 24 hours.

The solar wind speed has fluctuated between 355 and 450 km/s over the past 24 hours. The total magnetic field strength fluctuated around 5 nT for much of the period, with a minimum of 0.6 nT and a maximum of 7.1 nT recorded. The Bz component was predominantly positive and ranged between -4.8 and +7.1 nT.

Geomagnetic conditions have been quiet to unsettled over the past 24 hours, with Kp index (NOAA) and local K index (Dourbes) ranging between 1-2 and 1-3, respectively. Quiet to unsettled geomagnetic conditions are expected to continue over the next 24 hours, due to the weak solar wind stream associated with the patchy negative polarity equatorial coronal hole which began to traverse the central meridian on 18 May.

Today's estimated international sunspot number (ISN): 000, based on 21 stations.

Solar indices for 20 May 2019

Wolf number Catania	///
10cm solar flux	069
AK Chambon La Forêt	008
AK Wingst	008
Estimated Ap	007
Estimated international sunspot number	000 - Based on 20 stations

Noticeable events summary

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

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