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 : 30/11/2025 04:11:02 UTC
Il y a actuellement 7 message(s) (dont 2 alerte(s) et 4 message(s) encore actif(s) au SWPC)
SUMMARY : 10cm Radio Burst
28/11/2025 22:35:00 UTC > Détailsn/a
Space Weather Message Code: SUM10R
Serial Number: 889
Issue Time: 2025 Nov 28 2235 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 28 2220 UTC
Maximum Time: 2025 Nov 28 2221 UTC
End Time: 2025 Nov 28 2221 UTC
Duration: 1 minutes
Peak Flux: 240 sfu
Latest Penticton Noon Flux: 120 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
FermerALERT : Type II Radio Emission
28/11/2025 22:47:00 UTC > DétailsImpact terrestre : 01/12/2025 00:34:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1447
Issue Time: 2025 Nov 28 2247 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 Nov 28 2223 UTC
Estimated Velocity: 828 km/s
Description: Type II emissions occur in association with eruptions on the sun and typically indicate a coronal mass ejection is associated with a flare event.
FermerSUMMARY : 10cm Radio Burst
29/11/2025 02:00:00 UTC > Détailsn/a
Space Weather Message Code: SUM10R
Serial Number: 890
Issue Time: 2025 Nov 29 0200 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 29 0143 UTC
Maximum Time: 2025 Nov 29 0143 UTC
End Time: 2025 Nov 29 0143 UTC
Duration: 1 minutes
Peak Flux: 140 sfu
Latest Penticton Noon Flux: 138 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
FermerALERT : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu
29/11/2025 05:00:00 UTC > Détailsn/a
Space Weather Message Code: ALTEF3
Serial Number: 3566
Issue Time: 2025 Nov 29 0500 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3565
Begin Time: 2025 Nov 25 1450 UTC
Yesterday Maximum 2MeV Flux: 14759 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
FermerWARNING : EXTENDED Geomagnetic K-index of 4 expected
29/11/2025 11:58:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5168
Issue Time: 2025 Nov 29 1158 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5167
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 29 2359 UTC
Warning Condition: Persistence
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
FermerSUMMARY : 10cm Radio Burst
29/11/2025 20:57:00 UTC > Détailsn/a
Space Weather Message Code: SUM10R
Serial Number: 891
Issue Time: 2025 Nov 29 2057 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Nov 29 2011 UTC
Maximum Time: 2025 Nov 29 2012 UTC
End Time: 2025 Nov 29 2013 UTC
Duration: 2 minutes
Peak Flux: 170 sfu
Latest Penticton Noon Flux: 160 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
FermerWARNING : EXTENDED Geomagnetic K-index of 4 expected
29/11/2025 23:55:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5169
Issue Time: 2025 Nov 29 2355 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5168
Valid From: 2025 Nov 24 0226 UTC
Now Valid Until: 2025 Nov 30 1200 UTC
Warning Condition: Persistence
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 65 degrees Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and Alaska.
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
R0
HF Bands Noise Level
S3-S4
Indices bruts
SFI
152
SSN
74
Ap
21
Kp
4
Kp Lat.
58,3°
X-Ray (HAF)
C2,3 (8,67 MHz)
Protons E>10 MeV
0,14
Electrons >2MeV
2 880,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
653,9
Proton Density (p/cc)
1,7
Ion Temperature (°K)
231 000,0
IMF Bt (nT)
4,8
IMF Bz (nT)
2,7
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
8 (HPI=47)
Impact as low as
56,7°
Expected in
-9 min.
Data source
NOAA SWPC
South auroral activity
8 (HPI=40)
Impact as low as
56,7°
Expected in
-9 min.
Data source
NOAA SWPC
Mise à jour des indices : 30/11/2025 04:09:02 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 »…)
