Cette page présente les indices géomagnétiques et solaires, ainsi que les alertes du Space Weather Prediction Center (NOAA – USA) en vigueur actuellement.
Pour plus d’information sur ces alertes, visitez : http://www.swpc.noaa.gov/noaa-scales-explanation.
Messages émis par le NOAA/Space Weather Prediction Center
Mise à jour : 03/02/2026 21:17:20 UTC
Il y a actuellement 8 message(s) (dont 4 alerte(s) et 8 message(s) encore actif(s) au SWPC)
ALERT : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu
03/02/2026 04:59:00 UTC > Détailsn/a
Space Weather Message Code: ALTEF3
Serial Number: 3619
Issue Time: 2026 Feb 03 0459 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3618
Begin Time: 2026 Jan 21 0950 UTC
Yesterday Maximum 2MeV Flux: 7292 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
FermerALERT : X-Ray Flux exceeded M5
03/02/2026 07:02:00 UTC > Détailsn/a
Space Weather Message Code: ALTXMF
Serial Number: 517
Issue Time: 2026 Feb 03 0702 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Feb 03 0700 UTC
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
SUMMARY : X-ray Event exceeded M5
03/02/2026 07:25:00 UTC > Détailsn/a
Space Weather Message Code: SUMXM5
Serial Number: 309
Issue Time: 2026 Feb 03 0725 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 Feb 03 0643 UTC
Maximum Time: 2026 Feb 03 0701 UTC
End Time: 2026 Feb 03 0719 UTC
X-ray Class: M7.2
Location: N14E17
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
FermerALERT : X-Ray Flux exceeded M5
03/02/2026 14:11:00 UTC > Détailsn/a
Space Weather Message Code: ALTXMF
Serial Number: 518
Issue Time: 2026 Feb 03 1411 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Feb 03 1407 UTC
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
SUMMARY : X-ray Event exceeded X1
03/02/2026 14:28:00 UTC > Détailsn/a
Space Weather Message Code: SUMX01
Serial Number: 210
Issue Time: 2026 Feb 03 1428 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Feb 03 1358 UTC
Maximum Time: 2026 Feb 03 1408 UTC
End Time: 2026 Feb 03 1418 UTC
X-ray Class: X1.5
Location: N14E14
NOAA Scale: R3 - Strong
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
FermerALERT : X-Ray Flux exceeded M5
03/02/2026 14:58:00 UTC > Détailsn/a
Space Weather Message Code: ALTXMF
Serial Number: 519
Issue Time: 2026 Feb 03 1458 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Feb 03 1455 UTC
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
SUMMARY : X-ray Event exceeded M5
03/02/2026 15:10:00 UTC > Détailsn/a
Space Weather Message Code: SUMXM5
Serial Number: 310
Issue Time: 2026 Feb 03 1510 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2026 Feb 03 1445 UTC
Maximum Time: 2026 Feb 03 1456 UTC
End Time: 2026 Feb 03 1503 UTC
X-ray Class: M7.2
Location: N14E14
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
FermerWATCH : Geomagnetic Storm Category G1 Predicted
03/02/2026 16:46:00 UTC > Détailsn/a
Space Weather Message Code: WATA20
Serial Number: 1093
Issue Time: 2026 Feb 03 1646 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Feb 04: None (Below G1) Feb 05: G1 (Minor) Feb 06: G1 (Minor)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 60 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Spacecraft - Minor impact on satellite operations possible.
Aurora - Aurora may be visible at high latitudes, i.e., northern tier of the U.S. such as northern Michigan and Maine.
Fermer
Conditions HF, indices solaires et géomagnétiques et historique quotidien
La plupart de ces données sont mises à jour en temps réel.
Conditions HF
NOAA Scale Activity
G0
n/a
HF Bands Noise Level
S0-S1
Indices bruts
SFI
172
SSN
131
Ap
5
Kp
1
Kp Lat.
64,5°
X-Ray (HAF)
Protons E>10 MeV
0,16
Electrons >2MeV
4 660,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
299,6
Proton Density (p/cc)
2,9
Ion Temperature (°K)
46 300,0
IMF Bt (nT)
8,9
IMF Bz (nT)
3,2
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-52131 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-52131 min.
Data source
NOAA SWPC
Mise à jour des indices : 03/02/2026 21:16:20 UTC
Historique des indices pour la journée
Cette page réunit de nombreux indices solaires et terrestres. Ces données sont issues des satellites défilants (TIROS n – NOAA), géostationnaires (GOES – NOAA), ainsi que des satellites SOHO (NASA/ESA) et SDO/EVE (NASA). Les données de flux solaire proviennent quant à elles de l’observatoire de Penticton (CA).
Certaines valeurs sont des moyennes calculées sur les 15 dernières minutes (Bt et Bz), le flux solaire est publié à 17:00, 21:00 et 23:00 (UTC). Les autres sont des valeurs en temps réel (ou presque).
Une juxtaposition des données historisées de cette page et de l’historique de réception de FAROS est disponible sur cette page.
Merci à Paul, N0NBH pour son aide et sa patience (son site est très intéressant : www.hamqsl.com)
Plus d’infos sur ces indices :
– NOAA Space Weather Scales – http://www.swpc.noaa.gov/NOAAscales
– NOAA Tips on viewing the Aurora – http://www.swpc.noaa.gov/products/aurora-30-minute-forecast
Références :
– HF Ionospheric Radio Signal Propagation (en) http://www.radio-electronics.com/info/propagation/ionospheric/hf-propagation-basics.php
– Glossaire du SWPC de la NOAA (en) : http://legacy-www.swpc.noaa.gov/info/glossary.html
– What the data means – Scott Bidstrup, W7RI (en) http://www.bidstrup.com/w7ri-hf-radio-propagation.htm
– Understanding HF Radio Propagation Forecasts, N0HR (en) : http://www.n0hr.com/radio_propagation.htm
– Ionosphere Properties and Behaviors – Marcel H. De Canck ON5AU, AntenneX n°110 / Juin 2006 (en) : www.antennex.com (site hors ligne, essayez la « wayback machine »…)
– Ham-Bands propagation properties – Marcel H. De Canck ON5AU, AntenneX n°142 / Février 2009 (en) : www.antennex.com (site hors ligne, essayez la « wayback machine »…)
