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 : 04/03/2026 16:47:39 UTC
Il y a actuellement 6 message(s) (dont 2 alerte(s) et 6 message(s) encore actif(s) au SWPC)
WARNING : Geomagnetic K-index of 4 expected
03/03/2026 22:08:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5276
Issue Time: 2026 Mar 03 2208 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 03 2208 UTC
Valid To: 2026 Mar 04 0600 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
03/03/2026 22:28:00 UTC > Détailsn/a
Space Weather Message Code: ALTK04
Serial Number: 2637
Issue Time: 2026 Mar 03 2228 UTC
ALERT: Geomagnetic K-index of 4
Synoptic Period: 2100-2400 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 : Geomagnetic K-index of 5 expected
03/03/2026 22:30:00 UTC > Détailsn/a
Space Weather Message Code: WARK05
Serial Number: 2202
Issue Time: 2026 Mar 03 2230 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 03 2230 UTC
Valid To: 2026 Mar 04 0300 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.
FermerWARNING : Geomagnetic K-index of 5 expected
03/03/2026 22:32:00 UTC > Détailsn/a
Space Weather Message Code: WARK05
Serial Number: 2202
Issue Time: 2026 Mar 03 2232 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2026 Mar 03 2230 UTC
Valid To: 2026 Mar 04 0300 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.
FermerALERT : Geomagnetic K-index of 5
03/03/2026 22:48:00 UTC > Détailsn/a
Space Weather Message Code: ALTK05
Serial Number: 1971
Issue Time: 2026 Mar 03 2248 UTC
ALERT: Geomagnetic K-index of 5
Synoptic Period: 2100-2400 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.
FermerWATCH : Geomagnetic Storm Category G1 Predicted
03/03/2026 23:05:00 UTC > Détailsn/a
Space Weather Message Code: WATA20
Serial Number: 1098
Issue Time: 2026 Mar 03 2305 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Mar 04: None (Below G1) Mar 05: None (Below G1) Mar 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
R0
HF Bands Noise Level
S0-S1
Indices bruts
SFI
140
SSN
64
Ap
16
Kp
1
Kp Lat.
64,5°
X-Ray (HAF)
B5,4 (2,36 MHz)
Protons E>10 MeV
0,18
Electrons >2MeV
305,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
425,7
Proton Density (p/cc)
1,5
Ion Temperature (°K)
190 000,0
IMF Bt (nT)
5,2
IMF Bz (nT)
-2,5
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-93621 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-93621 min.
Data source
NOAA SWPC
Mise à jour des indices : 04/03/2026 16:46:39 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 »…)
