Het archief bekijken van donderdag 28 april 2022

Dagelijks bulletin over zonne- en geomagnetische activiteit van het SIDC

Datum verslag: 2022 Apr 28 1240 UTC

SIDC Prognose

Zonnevlammen

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

Geomagnetisme

Quiet (A<20 and K<4)

Proton Flux monitor

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.

Het geschatte internationale zonnevlekkengetal (ISN) van vandaag: 131, gebaseerd op 16 stations.

Zon indexen voor 27 Apr 2022

Wolfgetal Catania	124
10cm zonneflux	142
AK Chambon La Forêt	///
AK Wingst	021
Geschatte Ap	018
Geschat internationaal zonnevlekkengetal	128 - Gebaseerd op 28 stations

Overzicht opvallende gebeurtenissen

Aangeboden door het Solar Influences Data Analysis Center© - SIDC - Verwerkt door SpaceWeatherLive

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