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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2022 Apr 27 1231 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
27 Apr 2022	151	006
28 Apr 2022	151	007
29 Apr 2022	151	007

Bulletin

Solar flaring activity was mostly at low levels over the last 24 hours with few C-class flares from several active regions that are located on the solar disc visible from Earth. Two new regions have turned around the visible disc, Catania sunspot group 91 (NOAA active region 3000) and Catania sunspot group 92 (NOAA active region 3001). For the next 24 hours, C-class flares are expected with still also a small chance for an M-class flare.

No Earth directed Coronal Mass Ejection (CME) has been detected in the available coronagraph imagery over the last 24 hours.

The greater than 2 MeV electron flux remained below the 1000 pfu alert threshold and is expected to remain below the threshold in the next 24 hours. The greater than 2 MeV electron fluence was at nominal levels in the past 24 hours and is expected remained at nominal levels in the next 24 hours.

The solar wind parameters in Earth environment (as recorded by DSCOVR) showed a solar wind speed regime close to ambient background levels over the past 24 hours. The solar wind speed fluctuated around 370 km/s and 470 km/s. The interplanetary magnetic field magnitude remained below 6 nT with a magnetic field orientation indicating connection to a positive polarity sector. Currently the solar wind interplanetary magnetic field magnitude shows and an increase up to 10 nT possibly due to the passage of a solar wind transient event. An equatorial coronal hole (negative polarity) is now facing Earth. The high-speed streams coming from this coronal hole is expected to reach Earth in about three days.

The geomagnetic conditions were mostly quiet (NOAA Kp 0-2) with short sporadic periods of unsettled conditions observed by the local station in Belgium (K-Belgium 0-3). Due to the passage of the solar wind transient event, the geomagnetic conditions may be more active in the following hours. Then geomagnetic conditions are expected to be mostly quiet with possible isolated periods of unsettled condition for the next couple of days before the arrival of the fast solar wind originating from the equatorial coronal hole currently facing Earth.

Today's estimated international sunspot number (ISN): 130, based on 19 stations.

Solar indices for 26 Apr 2022

Wolf number Catania	142
10cm solar flux	150
AK Chambon La Forêt	007
AK Wingst	003
Estimated Ap	003
Estimated international sunspot number	120 - Based on 30 stations

Noticeable events summary

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

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