Het archief bekijken van zondag 25 april 2021

Daily bulletin on solar and geomagnetic activity from the SIDC

Datum verslag: 2021 Apr 25 1241 UTC

SIDC Forecast

Valid from 1230 UTC, 25 Apr 2021 until 27 Apr 2021
Zonnevlammen

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

Geomagnetism

Active conditions expected (A>=20 or K=4)

Proton Flux monitor

Quiet

10cm fluxAp
25 Apr 2021079019
26 Apr 2021080011
27 Apr 2021081006

Bulletin

Number of B-class and one C-class flares were reported during last 24 hours. Majority of the flaring activity originated from the Catania sunspot group 89 (NOAA AR 2820). The C2.6 flare (peaked at 01:35 UT on April 25) originated from the Catania sunspot group 87 (NOAA AR 2816). The flare was associated with the EUV wave, coronal dimmings and rather narrow CME as seen in the available SOHO/LASCO C2 and STEREO/COR2 observations. We expect the present level of the solar flaring activity to persist in the coming hours. We expect B-class and C-class flares while M-class flares are, although possible, not very probable. There were no Earth directed CMEs observed during last 24 hours and the proton flux levels remained at background values.

The greater than 2MeV electron flux was most of the time above the 1000 pfu threshold, and it is expected to stay so in the coming hours. The 24h electron fluence is at moderate level and is likely it will stay so in the next 24 hours.

The solar wind speed is presently about 480 km/s and the interplanetary magnetic field magnitude is about 7 nT. The in situ observations show arrival of the shock wave at about 22:27 UT on April 24. The sudden increase of the interplanetary magnetic field strength (from 5 to 10 nT), was simultaneous with the density, solar wind velocity and temperature increase. The shock wave was driven by the partial halo CME first seen in the SOHO LASCO C2 field of view at about 06:12 UT on April 22. The CME was associated with C3.8 flare (peaked at 04:35 UT) that originated from the Catania sunspot group 87 (NOAA AR 2816) at that moment situated at the center of the solar disc. The CME arrived to Earth about half a day earlier then expected. This discrepancy is possibly due to uncertainty in the estimation of the halo and partial halo CME speeds. Arrival of the shock wave induced disturbed geomagnetic conditions (Kp=4 and K=5, reported by Dourbes and NOAA respectively) from about midnight until 04 UT this morning. The geomagnetic conditions are presently unsettled to quiet and we expect them to stay so in the coming hours.

Today's estimated international sunspot number (ISN): 053, based on 20 stations.

Solar indices for 24 Apr 2021

Wolf number Catania///
10cm solar flux079
AK Chambon La Forêt023
AK Wingst008
Estimated Ap008
Estimated international sunspot number055 - Based on 32 stations

Noticeable events summary

DayBeginMaxEindeLocStrengthOP10cmCatania/NOAARadio burst types
Geen

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

Alle tijden in UTC

<< Keer terug naar de dagelijkse overview pagina

Op basis van de huidige parameters is er nu geen kans op poollicht in België en Nederland

Op basis van de huidige parameters is er in de nabije toekomst een beperkte kans op poollicht op de volgende locaties van de hoge breedtegraad

Gillam, MB, Yellowknife, NT

Laatste nieuws

Steun Poollicht.be!

Om ook bereikbaar te blijven bij grote poollichtkansen hebben we een zware server nodig die alle bezoekers aankan. Doneer en steun dit project zodat we online blijven en je geen enkele poollichtkans mist!

Donneer SpaceWeatherLive Pro
Steun SpaceWeatherLive met onze merchandise
Check nu onze merchandise

Laatste alerts

woensdag 2 april 2025
04:03 UTC - Hemisferisch vermogen

Het OVATION-model voorspelt dat het hemisferisch vermogen 50GW zal bereiken om 04:56 UTC


01:45 UTC - Geomagnetische activiteit

Actieve geomagnetische condities (Kp4) Drempel bereikt: 01:32 UTC

alert


dinsdag 1 april 2025
22:51 UTC - Zonnevlam

Matige M2.5 zonnevlam

alert


22:30 UTC - Radio blackout

Kleine R1 radio blackout gedetecteerd (≥M1 - momenteel: M1.45)


07:15 UTC - 10cm radio-uitbarsting

Begintijd: 01/04/2025 06:45 UTC Maximumtijd: 01/04/2025 06:45 UTC Duurtijd: 1 minuten. Piekflux: 190 sfu


Ontvang directe meldingen!

Ruimteweer feitjes

Laatste X-klasse uitbarsting28/03/2025X1.1
Laatste M-klasse uitbarsting01/04/2025M2.5
Laatste geomagnetische storm27/03/2025Kp5 (G1)
Zonnevlekkenloze dagen
Laatste zonnevlekkenloze dag08/06/2022
Maandelijks gemiddeld zonnevlekkengetal
februari 2025154.6 +17.6
april 2025152.5 -2.1
Afgelopen 30 dagen130.7 -17.9

Deze dag in de geschiedenis*

Zonnevlammen
12001X1.77
22017M8.35
31999M6.2
42001M3.57
52017M1.81
DstG
11979-168G4
21960-151G3
31992-105G2
42004-104G2
51994-103G3
*sinds 1994

Sociale netwerken