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 : 12/01/2026 16:53:55 UTC
Il y a actuellement 9 message(s) (dont 5 alerte(s) et 7 message(s) encore actif(s) au SWPC)
ALERT : Type II Radio Emission
09/01/2026 10:24:00 UTC > DétailsImpact terrestre : 17/01/2026 22:14:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1464
Issue Time: 2026 Jan 09 1024 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 09 0932 UTC
Estimated Velocity: 203 km/s
Comment: Current imagery does not suggest any on-disk source at this time.
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.
FermerALERT : Type II Radio Emission
09/01/2026 15:17:00 UTC > DétailsImpact terrestre : 18/01/2026 04:31:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1465
Issue Time: 2026 Jan 09 1517 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 09 1244 UTC
Estimated Velocity: 200 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.
FermerALERT : Geomagnetic K-index of 5
11/01/2026 17:28:00 UTC > Détailsn/a
Space Weather Message Code: ALTK05
Serial Number: 1941
Issue Time: 2026 Jan 11 1728 UTC
ALERT: Geomagnetic K-index of 5
Synoptic Period: 1500-1800 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
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.
FermerALERT : Geomagnetic K-index of 5
11/01/2026 19:09:00 UTC > Détailsn/a
Space Weather Message Code: ALTK05
Serial Number: 1942
Issue Time: 2026 Jan 11 1909 UTC
ALERT: Geomagnetic K-index of 5
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
NOAA Scale: G1 - Minor
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.
FermerWARNING : EXTENDED Geomagnetic K-index of 4 expected
11/01/2026 19:19:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5217
Issue Time: 2026 Jan 11 1919 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5216
Valid From: 2026 Jan 10 0732 UTC
Now Valid Until: 2026 Jan 12 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.
FermerWARNING : EXTENDED Geomagnetic K-index of 5 expected
11/01/2026 19:19:00 UTC > Détailsn/a
Space Weather Message Code: WARK05
Serial Number: 2170
Issue Time: 2026 Jan 11 1919 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2169
Valid From: 2026 Jan 11 1419 UTC
Now Valid Until: 2026 Jan 12 0600 UTC
Warning Condition: Persistence
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.
FermerWARNING : Geomagnetic K-Index of 6 expected
11/01/2026 19:19:00 UTC > Détailsn/a
Space Weather Message Code: WARK06
Serial Number: 632
Issue Time: 2026 Jan 11 1919 UTC
WARNING: Geomagnetic K-Index of 6 expected
Valid From: 2026 Jan 11 1917 UTC
Valid To: 2026 Jan 12 0300 UTC
Warning Condition: Onset
NOAA Scale: G2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact primarily poleward of 55 degrees Geomagnetic Latitude.
Induced Currents - Power grid fluctuations can occur. High-latitude power systems may experience voltage alarms.
Spacecraft - Satellite orientation irregularities may occur; increased drag on low Earth-orbit satellites is possible.
Radio - HF (high frequency) radio propagation can fade at higher latitudes.
Aurora - Aurora may be seen as low as New York to Wisconsin to Washington state.
FermerWARNING : EXTENDED Geomagnetic K-index of 4 expected
12/01/2026 09:02:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5218
Issue Time: 2026 Jan 12 0902 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5217
Valid From: 2026 Jan 10 0732 UTC
Now Valid Until: 2026 Jan 12 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.
FermerALERT : Electron 2MeV Integral Flux exceeded 1000pfu
12/01/2026 11:01:00 UTC > Détailsn/a
Space Weather Message Code: ALTEF3
Serial Number: 3598
Issue Time: 2026 Jan 12 1101 UTC
ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Threshold Reached: 2026 Jan 12 1040 UTC
Station: GOES-19
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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
S0-S1
Indices bruts
SFI
108
SSN
84
Ap
28
Kp
1
Kp Lat.
64,5°
X-Ray (HAF)
C1,0 (5,09 MHz)
Protons E>10 MeV
0,19
Electrons >2MeV
1 590,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
626,6
Proton Density (p/cc)
2,4
Ion Temperature (°K)
336 000,0
IMF Bt (nT)
7,2
IMF Bz (nT)
5,4
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-20187 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-20187 min.
Data source
NOAA SWPC
Mise à jour des indices : 12/01/2026 16:52:55 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 »…)
