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 : 30/03/2026 08:42:36 UTC
Il y a actuellement 10 message(s) (dont 4 alerte(s) et 10 message(s) encore actif(s) au SWPC)
ALERT : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu
29/03/2026 12:47:00 UTC > Détailsn/a
Space Weather Message Code: ALTEF3
Serial Number: 3660
Issue Time: 2026 Mar 29 1247 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3659
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 1596 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
FermerWARNING : Geomagnetic K-index of 4 expected
29/03/2026 15:48:00 UTC > Détailsn/a
Space Weather Message Code: WARK04
Serial Number: 5304
Issue Time: 2026 Mar 29 1548 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2026 Mar 29 1546 UTC
Valid To: 2026 Mar 30 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 : X-Ray Flux exceeded M5
30/03/2026 03:07:00 UTC > Détailsn/a
Space Weather Message Code: ALTXMF
Serial Number: 521
Issue Time: 2026 Mar 30 0307 UTC
ALERT: X-Ray Flux exceeded M5
Threshold Reached: 2026 Mar 30 0306 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
30/03/2026 03:22:00 UTC > DétailsImpact terrestre : 31/03/2026 01:12:00 UTC
Space Weather Message Code: ALTTP2
Serial Number: 1473
Issue Time: 2026 Mar 30 0322 UTC
ALERT: Type II Radio Emission
Begin Time: 2026 Mar 30 0300 UTC
Estimated Velocity: 1872 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.
FermerSUMMARY : X-ray Event exceeded X1
30/03/2026 03:53:00 UTC > Détailsn/a
Space Weather Message Code: SUMX01
Serial Number: 212
Issue Time: 2026 Mar 30 0353 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Mar 30 0247 UTC
Maximum Time: 2026 Mar 30 0319 UTC
End Time: 2026 Mar 30 0344 UTC
X-ray Class: X1.5
Location: S27E42
NOAA Scale: R3 - Strong
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
FermerSUMMARY : CANCEL X-ray Event exceeded X1
30/03/2026 05:16:00 UTC > Détailsn/a
Space Weather Message Code: SUMX01
Serial Number: 213
Issue Time: 2026 Mar 30 0516 UTC
CANCEL SUMMARY: X-ray Event exceeded X1
Cancel Serial Number: 212
Original Issue Time: 2026 Mar 30 0353 UTC
Comment: The flare maximum was recorded as an X1.4.
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
FermerSUMMARY : X-ray Event exceeded X1
30/03/2026 05:18:00 UTC > Détailsn/a
Space Weather Message Code: SUMX01
Serial Number: 214
Issue Time: 2026 Mar 30 0518 UTC
SUMMARY: X-ray Event exceeded X1
Begin Time: 2026 Mar 30 0247 UTC
Maximum Time: 2026 Mar 30 0319 UTC
End Time: 2026 Mar 30 0344 UTC
X-ray Class: X1,4
Location: S27E42
NOAA Scale: R3 - Strong
www.swpc.noaa.gov/noaa-scales-explanation
Potential Impacts: Area of impact consists of large portions of the sunlit side of Earth, strongest at the sub-solar point.
Radio - Wide area blackout of HF (high frequency) radio communication for about an hour.
FermerSUMMARY : 10cm Radio Burst
30/03/2026 05:43:00 UTC > Détailsn/a
Space Weather Message Code: SUM10R
Serial Number: 903
Issue Time: 2026 Mar 30 0543 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2026 Mar 30 0254 UTC
Maximum Time: 2026 Mar 30 0304 UTC
End Time: 2026 Mar 30 0342 UTC
Duration: 48 minutes
Peak Flux: 1800 sfu
Latest Penticton Noon Flux: 158 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.
FermerWATCH : Geomagnetic Storm Category G2 Predicted
30/03/2026 06:27:00 UTC > Détailsn/a
Space Weather Message Code: WATA30
Serial Number: 268
Issue Time: 2026 Mar 30 0627 UTC
WATCH: Geomagnetic Storm Category G2 Predicted
Highest Storm Level Predicted by Day:
Mar 30: G1 (Minor) Mar 31: G2 (Moderate) Apr 01: 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 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 : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu
30/03/2026 07:42:00 UTC > Détailsn/a
Space Weather Message Code: ALTEF3
Serial Number: 3661
Issue Time: 2026 Mar 30 0742 UTC
CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu
Continuation of Serial Number: 3660
Begin Time: 2026 Mar 22 1430 UTC
Yesterday Maximum 2MeV Flux: 3755 pfu
Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems.
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
153
SSN
125
Ap
12
Kp
3
Kp Lat.
60,4°
X-Ray (HAF)
C4,1 (11,11 MHz)
Protons E>10 MeV
0,20
Electrons >2MeV
701,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
475,5
Proton Density (p/cc)
4,0
Ion Temperature (°K)
136 000,0
IMF Bt (nT)
8,5
IMF Bz (nT)
-4,5
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-130576 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-130576 min.
Data source
NOAA SWPC
Mise à jour des indices : 30/03/2026 08:41:36 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 »…)
