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.
Mise à jour : 02/11/2021 19:30:13 UTC
Il y a actuellement 10 message(s) (dont 2 alerte(s) et 8 message(s) encore actif(s) au SWPC)
Serial Number: 719
Issue Time: 2021 Nov 01 0201 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2021 Nov 01 0129 UTC
Maximum Time: 2021 Nov 01 0133 UTC
End Time: 2021 Nov 01 0134 UTC
Duration: 5 minutes
Peak Flux: 210 sfu
Latest Penticton Noon Flux: 103 sfu
www.swpc.noaa.gov/noaa-scales-explanation
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.
Serial Number: 1105
Issue Time: 2021 Nov 01 0209 UTC
ALERT: Type II Radio Emission
Begin Time: 2021 Nov 01 0129 UTC
Estimated Velocity: 626 km/s
www.swpc.noaa.gov/noaa-scales-explanation
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.
Serial Number: 2247
Issue Time: 2021 Nov 01 2140 UTC
ALERT: Geomagnetic K-index of 4
Threshold Reached: 2021 Nov 01 2140 UTC
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.
Serial Number: 3953
Issue Time: 2021 Nov 01 2140 UTC
WARNING: Geomagnetic K-index of 4 expected
Valid From: 2021 Nov 01 2135 UTC
Valid To: 2021 Nov 02 0300 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.
Serial Number: 720
Issue Time: 2021 Nov 01 2141 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2021 Nov 01 2111 UTC
Maximum Time: 2021 Nov 01 2114 UTC
End Time: 2021 Nov 01 2125 UTC
Duration: 14 minutes
Peak Flux: 110 sfu
Latest Penticton Noon Flux: 103 sfu
www.swpc.noaa.gov/noaa-scales-explanation
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.
Serial Number: 903
Issue Time: 2021 Nov 01 2150 UTC
WATCH: Geomagnetic Storm Category G1 Predicted
Highest Storm Level Predicted by Day:
Nov 02: None (Below G1) Nov 03: None (Below G1) Nov 04: 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.
Serial Number: 3954
Issue Time: 2021 Nov 02 0146 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3953
Valid From: 2021 Nov 01 2135 UTC
Now Valid Until: 2021 Nov 02 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.
Serial Number: 721
Issue Time: 2021 Nov 02 0311 UTC
SUMMARY: 10cm Radio Burst
Begin Time: 2021 Nov 02 0236 UTC
Maximum Time: 2021 Nov 02 0236 UTC
End Time: 2021 Nov 02 0237 UTC
Duration: 1 minutes
Peak Flux: 110 sfu
Latest Penticton Noon Flux: 98 sfu
www.swpc.noaa.gov/noaa-scales-explanation
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.
Serial Number: 1617
Issue Time: 2021 Nov 02 0521 UTC
WARNING: Geomagnetic K-index of 5 expected
Valid From: 2021 Nov 02 0521 UTC
Valid To: 2021 Nov 02 1500 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.
Space Weather Message Code: WARK04
Serial Number: 3955
Issue Time: 2021 Nov 02 0526 UTC
EXTENDED WARNING: Geomagnetic K-index of 4 expected
Extension to Serial Number: 3954
Valid From: 2021 Nov 01 2135 UTC
Now Valid Until: 2021 Nov 02 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.
Conditions HF, indices solaires et géomagnétiques et historique quotidien
La plupart de ces données sont mises à jour en temps réel.
Cette page réunit de nombreux indices solaires et terrestres. Ces données sont issues des satellites défilants (TIROS n – NOAA), GOES13 et GOES15 (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 »…)
