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Daily bulletin on solar and geomagnetic activity from the SIDC

Vydáno: 2022 Apr 28 1240 UTC

SIDC Forecast

Sluneční erupce

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

Geomagnetism

Quiet (A<20 and K<4)

Sluneční protony

Quiet

	10cm flux	Ap
28 Apr 2022	140	012
29 Apr 2022	140	010
30 Apr 2022	140	019

Bulletin

Solar flaring activity was mostly at low levels over the last 24 hours with few C-class flares observed from different active regions on the solar disc visible from Earth. The larger flare was a C7.6-flare coming from the unipolar region Catania sunspot group 84 (NOAA active region 2995). 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 an increase of the solar wind speed up to about 520 km/s and of the interplanetary magnetic field magnitude up to 12 nT. The Bz component of the interplanetary magnetic field reached up to -11 nT. This is the result of the passage of a solar wind transient structures. However the causes of this disturbance is not fully clear. The high-speed streams coming from the equatorial coronal hole (negative polarity) that reached the central meridian on April 26 is expected to reach Earth and enhance the solar wind parameters starting later on April 29 or earlier 20.

The geomagnetic conditions were active due to the passage of the solar wind transient event (NOAA Kp and local K-Belgium 3-5). The geomagnetic conditions may be still active in the following hours. Then geomagnetic conditions are expected to be mostly quiet with possible isolated periods of unsettled condition for the day before the arrival of the fast solar wind originating from the equatorial coronal hole that reached the central meridian on April 26.

Today's estimated international sunspot number (ISN): 131, based on 16 stations.

Solar indices for 27 Apr 2022

Wolf number Catania	124
10cm solar flux	142
AK Chambon La Forêt	///
AK Wingst	021
Estimated Ap	018
Estimated international sunspot number	128 - Based on 28 stations

Noticeable events summary

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

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