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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 May 28 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
28 May 2019	068	012
29 May 2019	068	013
30 May 2019	069	007

Bulletin

The solar activity has been quiet over the past 24 hours. The X-ray flux remains below B-level, and the visible solar disc is spotless. Solar activity is expected to remain at low levels very low over the next 24 hours.

No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph imagery. The greater than 10 MeV solar protons flux remained at nominal levels over the past 24 hours and is expected to remain so.

Solar wind parameters returned towards an ambient background and slow solar wind speed regime after the short passage of a solar wind structure observed yesterday. The wind speed fluctuated around 320 km/s, the interplanetary magnetic field strength decreased to values below 8 nT, and the southward component ranged between -5 nT and +5 nT. The solar wind parameters are expected to be enhanced later today and tomorrow with the arrival of the fast solar wind associated with the negative polarity equatorial coronal hole which began to traverse the central meridian on May 24.

The geomagnetic conditions have been quiet to unsettled with Kp index (NOAA) and local K index (Dourbes) ranging between 1 and 3. Active conditions with intervals of K-Dourbes = 4 are possible today and tomorrow, due to the expected arrival of a high-speed solar wind stream associated negative polarity equatorial coronal hole.

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

Solar indices for 27 May 2019

Wolf number Catania	000
10cm solar flux	068
AK Chambon La Forêt	016
AK Wingst	014
Estimated Ap	013
Estimated international sunspot number	000 - Based on 28 stations

Noticeable events summary

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

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