Indices solaires, géomagnétiques et alertes HF

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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 : 16/01/2026 19:27:48 UTC
Il y a actuellement 8 message(s) (dont 5 alerte(s) et 6 message(s) encore actif(s) au SWPC)
ALERT : Type II Radio Emission   09/01/2026 10:24:00 UTC   > Détails
Impact 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. Fermer
ALERT : Type II Radio Emission   09/01/2026 15:17:00 UTC   > Détails
Impact 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. Fermer
WATCH : Geomagnetic Storm Category G1 Predicted   15/01/2026 20:55:00 UTC   > Détails
n/a
Space Weather Message Code: WATA20 Serial Number: 1089 Issue Time: 2026 Jan 15 2055 UTC WATCH: Geomagnetic Storm Category G1 Predicted Highest Storm Level Predicted by Day: Jan 16: None (Below G1) Jan 17: G1 (Minor) Jan 18: 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
WARNING : Geomagnetic K-index of 4 expected   16/01/2026 02:54:00 UTC   > Détails
n/a
Space Weather Message Code: WARK04 Serial Number: 5221 Issue Time: 2026 Jan 16 0254 UTC WARNING: Geomagnetic K-index of 4 expected Valid From: 2026 Jan 16 0254 UTC Valid To: 2026 Jan 16 2359 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. Fermer
ALERT : Geomagnetic K-index of 4   16/01/2026 05:15:00 UTC   > Détails
n/a
Space Weather Message Code: ALTK04 Serial Number: 2624 Issue Time: 2026 Jan 16 0515 UTC ALERT: Geomagnetic K-index of 4 Synoptic Period: 0300-0600 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. Fermer
ALERT : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu   16/01/2026 12:27:00 UTC   > Détails
n/a
Space Weather Message Code: ALTEF3 Serial Number: 3602 Issue Time: 2026 Jan 16 1227 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3601 Begin Time: 2026 Jan 12 1040 UTC Yesterday Maximum 2MeV Flux: 9014 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. Fermer
WARNING : Geomagnetic K-index of 5 expected   16/01/2026 15:23:00 UTC   > Détails
n/a
Space Weather Message Code: WARK05 Serial Number: 2171 Issue Time: 2026 Jan 16 1523 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2026 Jan 16 1525 UTC Valid To: 2026 Jan 16 2100 UTC Warning Condition: Onset 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. Fermer
ALERT : Geomagnetic K-index of 5   16/01/2026 16:26:00 UTC   > Détails
n/a
Space Weather Message Code: ALTK05 Serial Number: 1943 Issue Time: 2026 Jan 16 1626 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. 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
G1
n/a
R0
HF Bands Noise Level
S4-S6
Indices bruts
SFI
139
SSN
123
Ap
20
Kp
5
Kp Lat.
56,3°
X-Ray (HAF)
C1,0 (5,13 MHz)
Protons E>10 MeV
0,16
Electrons >2MeV
1 580,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
681,1
Proton Density (p/cc)
2,9
Ion Temperature (°K)
402 000,0
IMF Bt (nT)
10,8
IMF Bz (nT)
-4,3
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-26100 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-26100 min.
Data source
NOAA SWPC
Mise à jour des indices : 16/01/2026 19:25:48 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 »…)