Indices solaires, géomagnétiques et alertes HF

Posted on by |

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 : 19/01/2026 20:20:48 UTC
Il y a actuellement 24 message(s) (dont 10 alerte(s) et 22 message(s) encore actif(s) au SWPC)
ALERT : Type II Radio Emission   18/01/2026 18:47:00 UTC   > Détails
Impact terrestre : 21/01/2026 05:57:00 UTC
Space Weather Message Code: ALTTP2 Serial Number: 1466 Issue Time: 2026 Jan 18 1847 UTC ALERT: Type II Radio Emission Begin Time: 2026 Jan 18 1759 UTC Estimated Velocity: 693 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
SUMMARY : 10cm Radio Burst   18/01/2026 19:55:00 UTC   > Détails
n/a
Space Weather Message Code: SUM10R Serial Number: 899 Issue Time: 2026 Jan 18 1955 UTC SUMMARY: 10cm Radio Burst Begin Time: 2026 Jan 18 1739 UTC Maximum Time: 2026 Jan 18 1757 UTC End Time: 2026 Jan 18 1944 UTC Duration: 122 minutes Peak Flux: 3200 sfu Latest Penticton Noon Flux: 148 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. Fermer
WARNING : Proton 10MeV Integral Flux above 10pfu expected   18/01/2026 21:30:00 UTC   > Détails
n/a
Space Weather Message Code: WARPX1 Serial Number: 617 Issue Time: 2026 Jan 18 2130 UTC WARNING: Proton 10MeV Integral Flux above 10pfu expected Valid From: 2026 Jan 18 2130 UTC Valid To: 2026 Jan 19 1200 UTC Warning Condition: Onset Predicted NOAA Scale: S1 - Minor www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. Fermer
ALERT : Proton Event 10MeV Integral Flux exceeded 10pfu   18/01/2026 23:11:00 UTC   > Détails
n/a
Space Weather Message Code: ALTPX1 Serial Number: 362 Issue Time: 2026 Jan 18 2311 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 10pfu Begin Time: 2026 Jan 18 2255 UTC NOAA Scale: S1 - Minor www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. Fermer
WARNING : EXTENDED Geomagnetic K-index of 4 expected   18/01/2026 23:54:00 UTC   > Détails
n/a
Space Weather Message Code: WARK04 Serial Number: 5225 Issue Time: 2026 Jan 18 2354 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 5224 Valid From: 2026 Jan 16 0254 UTC Now Valid Until: 2026 Jan 19 2359 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
WARNING : EXTENDED Proton 10MeV Integral Flux above 10pfu expected   19/01/2026 04:11:00 UTC   > Détails
n/a
Space Weather Message Code: WARPX1 Serial Number: 618 Issue Time: 2026 Jan 19 0411 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 617 Valid From: 2026 Jan 18 2130 UTC Now Valid Until: 2026 Jan 19 2359 UTC Warning Condition: Persistence Predicted NOAA Scale: S2 - Moderate Comment: This warning UPGRADED from S1 (Minor) to S2 (Moderate) due to increasing Proton flux levels. www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. Fermer
ALERT : Proton Event 10MeV Integral Flux exceeded 100pfu   19/01/2026 04:47:00 UTC   > Détails
n/a
Space Weather Message Code: ALTPX2 Serial Number: 80 Issue Time: 2026 Jan 19 0447 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 100pfu Begin Time: 2026 Jan 19 0440 UTC NOAA Scale: S2 - Moderate www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience small, increased radiation exposures. Spacecraft - Infrequent single-event upsets to satellites are possible. Radio - Small effects on polar HF (high frequency) propagation resulting in fades at lower frequencies. Fermer
ALERT : CONTINUED Electron 2MeV Integral Flux exceeded 1000pfu   19/01/2026 05:00:00 UTC   > Détails
n/a
Space Weather Message Code: ALTEF3 Serial Number: 3605 Issue Time: 2026 Jan 19 0500 UTC CONTINUED ALERT: Electron 2MeV Integral Flux exceeded 1000pfu Continuation of Serial Number: 3604 Begin Time: 2026 Jan 12 1040 UTC Yesterday Maximum 2MeV Flux: 4619 pfu Potential Impacts: Satellite systems may experience significant charging resulting in increased risk to satellite systems. Fermer
ALERT : Proton Event 10MeV Integral Flux exceeded 1000pfu   19/01/2026 10:29:00 UTC   > Détails
n/a
Space Weather Message Code: ALTPX3 Serial Number: 34 Issue Time: 2026 Jan 19 1029 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 1000pfu Begin Time: 2026 Jan 19 1020 UTC NOAA Scale: S3 - Strong www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience increasing radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to elevated radiation levels. Spacecraft - Single-event upsets to satellite operations, noise in imaging systems, and slight reduction of efficiency in solar panels are likely. Radio - Degraded or episodically blacked-out polar HF (high frequency) radio propagation. Fermer
WARNING : EXTENDED Proton 10MeV Integral Flux above 10pfu expected   19/01/2026 10:29:00 UTC   > Détails
n/a
Space Weather Message Code: WARPX1 Serial Number: 619 Issue Time: 2026 Jan 19 1029 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 618 Valid From: 2026 Jan 18 2130 UTC Now Valid Until: 2026 Jan 20 2359 UTC Warning Condition: Persistence Predicted NOAA Scale: S3 - Strong Comment: This warning UPGRADED from S2 (Moderate) to S3 (Strong) due to increasing Proton flux levels. www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. Fermer
WATCH : Geomagnetic Storm Category G4 or Greater Predicted   19/01/2026 12:03:00 UTC   > Détails
n/a
Space Weather Message Code: WATA99 Serial Number: 13 Issue Time: 2026 Jan 19 1203 UTC WATCH: Geomagnetic Storm Category G4 or Greater Predicted Highest Storm Level Predicted by Day: Jan 20: G4 (Severe) Jan 21: G1 (Minor) Jan 22: None (Below G1) THIS SUPERSEDES ANY/ALL PRIOR WATCHES IN EFFECT www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify. Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur. Navigation - Satellite navigation (GPS) degraded or inoperable for hours. Radio - HF (high frequency) radio propagation sporadic or blacked out. Aurora - Aurora may be seen as low as Alabama and northern California. Fermer
WARNING : EXTENDED Proton 10MeV Integral Flux above 10pfu expected   19/01/2026 18:14:00 UTC   > Détails
n/a
Space Weather Message Code: WARPX1 Serial Number: 620 Issue Time: 2026 Jan 19 1814 UTC EXTENDED WARNING: Proton 10MeV Integral Flux above 10pfu expected Extension to Serial Number: 619 Valid From: 2026 Jan 18 2130 UTC Now Valid Until: 2026 Jan 20 2359 UTC Warning Condition: Persistence Predicted NOAA Scale: S1 - Minor Comment: This warning UPGRADED from S3 (Strong) to S4 (Severe) due to increasing Proton flux levels. www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radio - Minor impacts on polar HF (high frequency) radio propagation resulting in fades at lower frequencies. Fermer
ALERT : Proton Event 10MeV Integral Flux exceeded 10000pfu   19/01/2026 18:19:00 UTC   > Détails
n/a
Space Weather Message Code: ALTPX4 Serial Number: 2 Issue Time: 2026 Jan 19 1819 UTC ALERT: Proton Event 10MeV Integral Flux exceeded 10000pfu Begin Time: 2026 Jan 19 1810 UTC NOAA Scale: S4 - Severe www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Radiation - Passengers and crew in high latitude, high altitude flights may experience significant radiation exposures. Astronauts on EVA (extra-vehicular activity) are exposed to unavoidable radiation hazard. Spacecraft - Satellites may experience memory device problems and noise on imaging systems; star-trackers may cause orientation problems; solar panel efficiency may be degraded. Radio - Widespread blackout of polar HF (high frequency) communications likely. Fermer
WARNING : Geomagnetic K-index of 5 expected   19/01/2026 19:06:00 UTC   > Détails
n/a
Space Weather Message Code: WARK05 Serial Number: 2174 Issue Time: 2026 Jan 19 1906 UTC WARNING: Geomagnetic K-index of 5 expected Valid From: 2026 Jan 19 1902 UTC Valid To: 2026 Jan 20 0900 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
WARNING : Geomagnetic K-Index of 6 expected   19/01/2026 19:06:00 UTC   > Détails
n/a
Space Weather Message Code: WARK06 Serial Number: 633 Issue Time: 2026 Jan 19 1906 UTC WARNING: Geomagnetic K-Index of 6 expected Valid From: 2026 Jan 19 1902 UTC Valid To: 2026 Jan 20 1800 UTC Warning Condition: Onset 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. Fermer
WARNING : Geomagnetic K-index of 7 or greater expected   19/01/2026 19:06:00 UTC   > Détails
n/a
Space Weather Message Code: WARK07 Serial Number: 140 Issue Time: 2026 Jan 19 1906 UTC WARNING: Geomagnetic K-index of 7 or greater expected Valid From: 2026 Jan 19 1902 UTC Valid To: 2026 Jan 20 1500 UTC Warning Condition: Onset NOAA Scale: G3 or greater www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices. Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur. Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur. Radio - HF (high frequency) radio may be intermittent. Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon. Fermer
WARNING : Geomagnetic Sudden Impulse expected   19/01/2026 19:09:00 UTC   > Détails
n/a
Space Weather Message Code: WARSUD Serial Number: 249 Issue Time: 2026 Jan 19 1909 UTC WARNING: Geomagnetic Sudden Impulse expected Valid From: 2026 Jan 19 1920 UTC Valid To: 2026 Jan 19 2000 UTC IP Shock Passage Observed: 2026 Jan 19 1903 UTC www.swpc.noaa.gov/noaa-scales-explanation Fermer
ALERT : Geomagnetic K-index of 5   19/01/2026 19:22:00 UTC   > Détails
n/a
Space Weather Message Code: ALTK05 Serial Number: 1946 Issue Time: 2026 Jan 19 1922 UTC ALERT: Geomagnetic K-index of 5 Synoptic Period: 1800-2100 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
ALERT : Geomagnetic K-index of 6   19/01/2026 19:24:00 UTC   > Détails
n/a
Space Weather Message Code: ALTK06 Serial Number: 682 Issue Time: 2026 Jan 19 1924 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. Fermer
WARNING : EXTENDED Geomagnetic K-index of 5 expected   19/01/2026 19:27:00 UTC   > Détails
n/a
Space Weather Message Code: WARK05 Serial Number: 2175 Issue Time: 2026 Jan 19 1927 UTC EXTENDED WARNING: Geomagnetic K-index of 5 expected Extension to Serial Number: 2174 Valid From: 2026 Jan 19 1902 UTC Now Valid Until: 2026 Jan 20 2359 UTC Warning Condition: Persistence Comment: Correction for end time. 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 : EXTENDED Geomagnetic K-index of 4 expected   19/01/2026 19:28:00 UTC   > Détails
n/a
Space Weather Message Code: WARK04 Serial Number: 5226 Issue Time: 2026 Jan 19 1928 UTC EXTENDED WARNING: Geomagnetic K-index of 4 expected Extension to Serial Number: 5225 Valid From: 2026 Jan 16 0254 UTC Now Valid Until: 2026 Jan 21 0300 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
ALERT : Geomagnetic K-index of 7   19/01/2026 19:30:00 UTC   > Détails
n/a
Space Weather Message Code: ALTK07 Serial Number: 201 Issue Time: 2026 Jan 19 1930 UTC ALERT: Geomagnetic K-index of 7 Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G3 - Strong www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 50 degrees Geomagnetic Latitude. Induced Currents - Power system voltage irregularities possible, false alarms may be triggered on some protection devices. Spacecraft - Systems may experience surface charging; increased drag on low Earth-orbit satellites and orientation problems may occur. Navigation - Intermittent satellite navigation (GPS) problems, including loss-of-lock and increased range error may occur. Radio - HF (high frequency) radio may be intermittent. Aurora - Aurora may be seen as low as Pennsylvania to Iowa to Oregon. Fermer
SUMMARY : Geomagnetic Sudden Impulse   19/01/2026 19:36:00 UTC   > Détails
n/a
Space Weather Message Code: SUMSUD Serial Number: 293 Issue Time: 2026 Jan 19 1936 UTC SUMMARY: Geomagnetic Sudden Impulse Observed: 2026 Jan 19 1920 UTC Deviation: 97 nT Station: BOU www.swpc.noaa.gov/noaa-scales-explanation Fermer
ALERT : Geomagnetic K-index of 8, 9-   19/01/2026 19:43:00 UTC   > Détails
n/a
Space Weather Message Code: ALTK08 Serial Number: 55 Issue Time: 2026 Jan 19 1943 UTC ALERT: Geomagnetic K-index of 8, 9- Synoptic Period: 1800-2100 UTC Active Warning: Yes NOAA Scale: G4 - Severe Comment: Currently at a Kp8- www.swpc.noaa.gov/noaa-scales-explanation Potential Impacts: Area of impact primarily poleward of 45 degrees Geomagnetic Latitude. Induced Currents - Possible widespread voltage control problems and some protective systems may mistakenly trip out key assets from the power grid. Induced pipeline currents intensify. Spacecraft - Systems may experience surface charging; increased drag on low earth orbit satellites, and tracking and orientation problems may occur. Navigation - Satellite navigation (GPS) degraded or inoperable for hours. Radio - HF (high frequency) radio propagation sporadic or blacked out. Aurora - Aurora may be seen as low as Alabama and northern California. 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
167
SSN
140
Ap
11
Kp
3
Kp Lat.
60,4°
X-Ray (HAF)
C6,0 (12,80 MHz)
Protons E>10 MeV
27 900,00
Electrons >2MeV
2 160,0
304A (SOHO)
0
304A (SDO/EVE)
376,0
Solar Wind (km/s)
292,5
Proton Density (p/cc)
9,6
Ion Temperature (°K)
66 800,0
IMF Bt (nT)
41,6
IMF Bz (nT)
-33,7
Prévisions d'activité géomagnétique polaire (Auroral activity) à 30 minutes
North auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-30474 min.
Data source
NOAA SWPC
South auroral activity
5 (HPI=10)
Impact as low as
62,5°
Expected in
-30474 min.
Data source
NOAA SWPC
Mise à jour des indices : 19/01/2026 20:19:48 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 »…)