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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2020 May 30 1243 UTC

SIDC Forecast

Brillamenti solari

C-class flares expected, (probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Protoni solari

Quiet

	10cm flux	Ap
30 May 2020	070	011
31 May 2020	069	007
01 Jun 2020	069	007

Bulletin

The not-numbered active region which was the source of 12 B-class, 2 C-class flares and 1 M-class flare, during last 36 hours seems to decrease its flaring activity. This active region just rotated to the visible side of the Sun, and it is presently situated close to the North- East solar limb. We can still expect some B-class, C-class and possibly also isolated M-class flares in the coming hours. During last 24 hours there were no Earth directed CMEs and the solar protons remained at the background level.

At about 19:20 UT on May 29, the interplanetary magnetic field magnitude started to slowly increase simultaneously with the solar wind speed, temperature and density. The interplanetary magnetic field magnitude reached maximum value of about 14 nT (at about 05:15 UT this morning), and its Bz component had simultaneously the minimum value of -12 nT. It is presently not completely clear if this is arrival of the faint CME or the corotating interaction region. However the sudden change of the phi angle (sector boundary) to negative value indicates that observed structure is the compression region in front of the fast solar wind originating from the negative polarity coronal hole. The arrival of this structure induced the unsettled geomagnetic conditions (Dourbes reported longer interval of K=3 and NOAA reported Kp=3). We expect unsettled to possibly active geomagnetic conditions in the coming hours.

Today's estimated international sunspot number (ISN): 000, based on 25 stations.

Solar indices for 29 May 2020

Wolf number Catania	///
10cm solar flux	070
AK Chambon La Forêt	012
AK Wingst	004
Estimated Ap	003
Estimated international sunspot number	000 - Based on 42 stations

Noticeable events summary

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

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