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 : 14/06/2025 20:15:12 UTC
Il y a actuellement 10 message(s) (dont 5 alerte(s) et 10 message(s) encore actif(s) au SWPC)
ALERT : Geomagnetic K-index of 6
13/06/2025 20:14:00 UTC > Détailsn/a
Space Weather Message Code: ALTK06
Serial Number: 649
Issue Time: 2025 Jun 13 2014 UTC
ALERT: Geomagnetic K-index of 6
Synoptic Period: 1800-2100 UTC
Active Warning: Yes
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
13/06/2025 20:54:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5002
Issue Time: 2025 Jun 13 2054 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5001
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 14 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.
FermerWARNING : EXTENDED Geomagnetic K-index of 5 expected
13/06/2025 20:54:00 UTC > Détailsn/a
Space Weather Message Code: WARK05
Serial Number: 2069
Issue Time: 2025 Jun 13 2054 UTC
EXTENDED WARNING: Geomagnetic K-index of 5 expected
Extension to Serial Number: 2068
Valid From: 2025 Jun 12 2020 UTC
Now Valid Until: 2025 Jun 14 1200 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 : EXTENDED Geomagnetic K-Index of 6 expected
13/06/2025 20:54:00 UTC > Détailsn/a
Space Weather Message Code: WARK06
Serial Number: 595
Issue Time: 2025 Jun 13 2054 UTC
EXTENDED WARNING: Geomagnetic K-Index of 6 expected
Extension to Serial Number: 594
Valid From: 2025 Jun 13 1331 UTC
Now Valid Until: 2025 Jun 14 0900 UTC
Warning Condition: Persistence
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.
FermerWATCH : Geomagnetic Storm Category G1 Predicted
13/06/2025 20:54:00 UTC > Détailsn/a
Space Weather Message Code: WATA20
Serial Number: 1046
Issue Time: 2025 Jun 13 2054 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Jun 14: G2 (Moderate) Jun 15: G1 (Minor) Jun 16: 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.
FermerALERT : Geomagnetic K-index of 5
13/06/2025 22:23:00 UTC > Détailsn/a
Space Weather Message Code: ALTK05
Serial Number: 1817
Issue Time: 2025 Jun 13 2223 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.
FermerALERT : Geomagnetic K-index of 6
13/06/2025 23:30:00 UTC > Détailsn/a
Space Weather Message Code: ALTK06
Serial Number: 650
Issue Time: 2025 Jun 13 2330 UTC
ALERT: Geomagnetic K-index of 6
Synoptic Period: 2100-2400 UTC
Active Warning: Yes
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.
FermerALERT : Geomagnetic K-index of 5
14/06/2025 03:02:00 UTC > Détailsn/a
Space Weather Message Code: ALTK05
Serial Number: 1818
Issue Time: 2025 Jun 14 0302 UTC
ALERT: Geomagnetic K-index of 5
Synoptic Period: 0000-0300 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
14/06/2025 04:53:00 UTC > Détailsn/a
Space Weather Message Code: ALTK05
Serial Number: 1819
Issue Time: 2025 Jun 14 0453 UTC
ALERT: Geomagnetic K-index of 5
Synoptic Period: 0300-0600 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
14/06/2025 17:23:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5003
Issue Time: 2025 Jun 14 1723 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 5002
Valid From: 2025 Jun 11 1710 UTC
Now Valid Until: 2025 Jun 15 0900 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
S2-S3
Indices bruts
SFI
158
SSN
134
Ap
38
Kp
3
Kp Lat.
60,4°
X-Ray (HAF)
C2,1 (8,16 MHz)
Protons E>10 MeV
0,17
Electrons >2MeV
182,0
304A (SOHO)
127,1
304A (SDO/EVE)
400,0
Solar Wind (km/s)
492,3
Proton Density (p/cc)
4,7
Ion Temperature (°K)
130 000,0
IMF Bt (nT)
6,8
IMF Bz (nT)
-0,6
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
6 (HPI=20)
Impact as low as
60,7°
Expected in
-9 min.
Data source
NOAA SWPC
South auroral activity
6 (HPI=22)
Impact as low as
60,7°
Expected in
-9 min.
Data source
NOAA SWPC
Mise à jour des indices : 14/06/2025 20:09:41 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 »…)
