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Daily bulletin on solar and geomagnetic activity from the SIDC

Emesso: 2019 Mar 25 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
25 Mar 2019	074	008
26 Mar 2019	073	011
27 Mar 2019	073	010

Bulletin

During last 24 hours several B-class flares were observed, and the strongest reported flare was B9.6 (peaked at 19:31 UT on March 24), originating from the NOAA AR 2736 (no Catania numbering). This active region, which was also source of many B-class and some C-class flares during past few days, has rotated over the west solar limb. Another active region which was observed on the visible side of the solar disc during last days, NOAA AR 2735 (no Catania numbering), is presently situated at the west solar limb. We can expect occasional B-class flares in the next 24 hours, while C-class flares are still possible but not probable. There were no Earth directed CMEs reported during last 24 hours and the solar protons remained at the background level.

The in situ observations (DSCOVR) indicate arrival of the CME-driven shock wave, at about 20:43 UT on March 24. The shock observed in the solar wind was associated with the March 20 CME. The arrival of the shock wave did not induced disturbed geomagnetic conditions (local station at Dourbes and NOAA reported only K=2 and Kp=2, respectively). The solar wind speed is about 330 km/s and the interplanetary magnetic field magnitude is 5 nT. The geomagnetic conditions are presently quiet and we expect them to stay so in the coming hours. The arrival of the fast solar wind, associated with the negative polarity equatorial coronal hole that is expected tomorrow, might induce unsettled to possibly active geomagnetic conditions.

Today's estimated international sunspot number (ISN): 000, based on 27 stations.

Solar indices for 24 Mar 2019

Wolf number Catania	///
10cm solar flux	075
AK Chambon La Forêt	006
AK Wingst	002
Estimated Ap	002
Estimated international sunspot number	016 - Based on 31 stations

Noticeable events summary

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

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