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 : 01/01/2026 04:36:25 UTC
Il y a actuellement 9 message(s) (dont 4 alerte(s) et 9 message(s) encore actif(s) au SWPC)
WARNING : Geomagnetic K-index of 4 expected
31/12/2025 13:36:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5198
Issue Time: 2025 Dec 31 1336 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2025 Dec 31 1335 UTC
Valid To: 2025 Dec 31 2100 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 : X-Ray Flux exceeded M5
31/12/2025 13:44:00 UTC > Détailsn/a
Space Weather Message Code: ALTXMF
Serial Number: 507
Issue Time: 2025 Dec 31 1344 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2025 Dec 31 1342 UTC
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered on sub-solar point on the sunlit side of Earth. Extent of blackout of HF (high frequency) radio communication dependent upon current X-ray Flux intensity. For real-time information on affected area and expected duration please see http://www.swpc.noaa.gov/products/d-region-absorption-predictions-d-rap.
ALERT : Type II Radio Emission
31/12/2025 14:00:00 UTC > DétailsImpact terrestre : 02/01/2026 12:05:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1461
Issue Time: 2025 Dec 31 1400 UTC
ALERT: Type II Radio Emission
Begin Time: 2025 Dec 31 1333 UTC
Estimated Velocity: 893 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 : Type IV Radio Emission
31/12/2025 14:01:00 UTC > Détailsn/a
Space Weather Message Code: ALTTP4
Serial Number: 701
Issue Time: 2025 Dec 31 1401 UTC
ALERT: Type IV Radio Emission
Begin Time: 2025 Dec 31 1342 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.
SUMMARY : 10cm Radio Burst
31/12/2025 14:19:00 UTC > Détailsn/a
Space Weather Message Code: SUM10R
Serial Number: 898
Issue Time: 2025 Dec 31 1419 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2025 Dec 31 1331 UTC
Maximum Time: 2025 Dec 31 1348 UTC
End Time: 2025 Dec 31 1353 UTC
Duration: 22 minutes
Peak Flux: 550 sfu
Latest Penticton Noon Flux: 182 sfu
Description: A 10cm radio burst indicates that the electromagnetic burst associated with a solar flare at the 10cm wavelength was double or greater than the initial 10cm radio background. This can be indicative of significant radio noise in association with a solar flare. This noise is generally short-lived but can cause interference for sensitive receivers including radar, GPS, and satellite communications.
FermerSUMMARY : X-ray Event exceeded M5
31/12/2025 14:25:00 UTC > Détailsn/a
Space Weather Message Code: SUMXM5
Serial Number: 303
Issue Time: 2025 Dec 31 1425 UTC
SUMMARY: X-ray Event exceeded M5
Begin Time: 2025 Dec 31 1312 UTC
Maximum Time: 2025 Dec 31 1351 UTC
End Time: 2025 Dec 31 1411 UTC
X-ray Class: M7.1
Location: N24E19
NOAA Scale: R2 - Moderate
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact centered primarily on sub-solar point on the sunlit side of Earth.
Radio - Limited blackout of HF (high frequency) radio communication for tens of minutes.
FermerALERT : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu
31/12/2025 16:32:00 UTC > Détailsn/a
Space Weather Message Code: ALTEF3
Serial Number: 3591
Issue Time: 2025 Dec 31 1632 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3590
Begin Time: 2025 Dec 21 1425 UTC
Yesterday Maximum 2MeV Flux: 5613 pfu
Comment: Electrons went over threshold at 31/1255 through 31/1530 UTC.
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
FermerWATCH : Geomagnetic Storm Category G2 Predicted
31/12/2025 22:59:00 UTC > Détailsn/a
Space Weather Message Code: WATA30
Serial Number: 263
Issue Time: 2025 Dec 31 2259 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Jan 01: G1 (Minor) Jan 02: G1 (Minor) Jan 03: G2 (Moderate)
THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT
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 : Geomagnetic K-index of 4 expected
01/01/2026 04:09:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5199
Issue Time: 2026 Jan 01 0409 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Jan 01 0430 UTC
Valid To: 2026 Jan 01 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.
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
168
SSN
127
Ap
7
Kp
2
Kp Lat.
62,4°
X-Ray (HAF)
C1,7 (7,23 MHz)
Protons E>10 MeV
0,16
Electrons >2MeV
157,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
464,9
Proton Density (p/cc)
2,0
Ion Temperature (°K)
209 000,0
IMF Bt (nT)
7,1
IMF Bz (nT)
-3,8
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-3610 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-3610 min.
Data source
NOAA SWPC
Mise à jour des indices : 01/01/2026 04:35:25 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 »…)
