Affichage des archives de mercredi, 20 avril 2005
Rapport d'activité solaire
Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Rapport d'activité solaire et géophysique 2005 Apr 20 2210 UTC# Prepared jointly by the U.S. Dept. of Commerce, NOAA, #Space Environment Center and the U.S. Air Force. #
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 110 publié à 2200Z le 20 Apr 2005IA. Analyse des régions solaires actives et activité du 19-2100Z au 20-2100Z Solar activity was very low. Region 755 (S12E37)
produced a B 8 flare at 19/2217 UTC with an associated Type II radio
sweep (estimated speed of 1128 km/s) and a CME with an estimated
speed of 776 km/s. The CME was directed to the east and is not
expected to be geoeffective. No new regions were numbered today.
IB. Prévisions d'activité solaire
Solar activity is expected to be very
low with a slight chance for an isolated C-flare.
IIA. Résumé de l'activité géophysique du 19-2100Z au 20-2100Z
The geomagnetic field was at quiet to minor storm levels. Heightened
activity was due to a solar sector boundary followed by the onset of
a coronal hole high speed stream. Solar wind speed at ACE increased
from approximately 350 km/s to 600 km/s. By the end of the period,
solar wind speed had decreased to approximately 450 km/s.
IIB. Prévision de l'activité géophysique
The geomagnetic field is
expected to be quiet to unsettled with isolated active conditions
possible on 21 April. On 22 April, conditions are expected to
increase to unsettled to active with minor storm periods possible as
another coronal hole high speed stream is expected to become
geoeffective. On 23 April, unsettled to active conditions are
expected.
III. Probabilité d'éruption solaire du 21 Apr au 23 Apr
| Classe M | 01% | 01% | 01% |
| Classe X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Flux Penticton 10.7 cm
Observé 20 Apr 077 Prévisionnel 21 Apr-23 Apr 080/080/080 Moyenne des 90 derniers jours 20 Apr 091
V. Indice géomagnetique A
Observé Afr/Ap 19 Apr 006/008 Estimé Afr/Ap 20 Apr 015/020 Prévisionnel Afr/Ap 21 Apr-23 Apr 010/015-015/018-012/015
VI. Probabilités d'activité géomagnétique du 21 Apr au 23 Apr
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 25% | 30% | 25% |
| Tempête mineure | 10% | 15% | 10% |
| Tempête majeure/sévère | 01% | 05% | 05% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 30% | 30% | 30% |
| Tempête mineure | 15% | 15% | 15% |
| Tempête majeure/sévère | 05% | 05% | 05% |
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