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 : 09/01/2026 16:10:25 UTC
Il y a actuellement 8 message(s) (dont 5 alerte(s) et 8 message(s) encore actif(s) au SWPC)
ALERT : Type IV Radio Emission
08/01/2026 18:57:00 UTC > Détailsn/a
Space Weather Message Code: ALTTP4
Serial Number: 702
Issue Time: 2026 Jan 08 1857 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Jan 08 1737 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
ALERT : Type II Radio Emission
08/01/2026 20:40:00 UTC > DétailsImpact terrestre : 10/01/2026 20:20:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1463
Issue Time: 2026 Jan 08 2040 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Jan 08 1944 UTC
Estimated Velocity: 855 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.
FermerWARNING : Geomagnetic K-index of 4 expected
09/01/2026 01:42:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5210
Issue Time: 2026 Jan 09 0142 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 09 0140 UTC
Valid To: 2026 Jan 09 0900 UTC
Warning Condition: Onset
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 : Geomagnetic K-index of 4
09/01/2026 03:06:00 UTC > Détailsn/a
Space Weather Message Code: ALTK04
Serial Number: 2622
Issue Time: 2026 Jan 09 0306 UTC
ALERT: Geomagnetic K-index of 4
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
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 4 expected
09/01/2026 08:48:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5211
Issue Time: 2026 Jan 09 0848 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5210
Valid From: 2026 Jan 09 0140 UTC
Now Valid Until: 2026 Jan 09 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.
FermerALERT : 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 IV Radio Emission
09/01/2026 10:59:00 UTC > Détailsn/a
Space Weather Message Code: ALTTP4
Serial Number: 703
Issue Time: 2026 Jan 09 1059 UTC
ALERT: Type IV Radio Emission
Begin Time: 2026 Jan 09 0944 UTC
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
WARNING : EXTENDED Geomagnetic K-index of 4 expected
09/01/2026 11:26:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5212
Issue Time: 2026 Jan 09 1126 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5211
Valid From: 2026 Jan 09 0140 UTC
Now Valid Until: 2026 Jan 09 1800 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
S1-S2
Indices bruts
SFI
127
SSN
96
Ap
11
Kp
2
Kp Lat.
62,4°
X-Ray (HAF)
B9,5 (4,79 MHz)
Protons E>10 MeV
0,16
Electrons >2MeV
252,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
480,6
Proton Density (p/cc)
3,6
Ion Temperature (°K)
83 900,0
IMF Bt (nT)
10,6
IMF Bz (nT)
-5
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-15824 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-15824 min.
Data source
NOAA SWPC
Mise à jour des indices : 09/01/2026 16:09:25 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 »…)
