Affichage des archives de mardi, 26 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 26 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 116 publié à 2200Z le 26 Apr 2005IA. Analyse des régions solaires actives et activité du 25-2100Z au 26-2100Z Solar activity increased to low levels today. Region
756 (S06E55) appears to be a magnetically complex beta-delta sunspot
group. There were several C-class flares produced from this region
during the period, the largest was an impulsive C5 x-ray event that
occurred at 26/0441Z. A disappearing filament was observed starting
late yesterday and continued into the early part of the interval.
This event resulted in a partial halo CME which was first observed
in SOHO/LASCO C2 imagery beginning at 24/2306Z. There is a chance
this CME may become geoeffective and produce a weak glancing blow as
it passes the Earth. No new regions were numbered today.
IB. Prévisions d'activité solaire
Solar activity is expected to be at
low levels. There is a slight chance for an isolated M-class flare
from Region 756.
IIA. Résumé de l'activité géophysique du 25-2100Z au 26-2100Z
The geomagnetic field was at quiet levels today.
IIB. Prévision de l'activité géophysique
The geomagnetic field is
expected to be at predominantly quiet to unsettled levels. The
partial halo CME seen today on the southwest limb may result in
isolated periods of active conditions on 29 April.
III. Probabilité d'éruption solaire du 27 Apr au 29 Apr
| Classe M | 20% | 20% | 20% |
| Classe X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Flux Penticton 10.7 cm
Observé 26 Apr 091 Prévisionnel 27 Apr-29 Apr 090/090/090 Moyenne des 90 derniers jours 26 Apr 090
V. Indice géomagnetique A
Observé Afr/Ap 25 Apr 009/011 Estimé Afr/Ap 26 Apr 003/005 Prévisionnel Afr/Ap 27 Apr-29 Apr 005/008-005/005-012/012
VI. Probabilités d'activité géomagnétique du 27 Apr au 29 Apr
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 15% | 15% | 25% |
| Tempête mineure | 01% | 01% | 10% |
| Tempête majeure/sévère | 01% | 01% | 05% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 20% | 15% | 25% |
| Tempête mineure | 05% | 01% | 10% |
| Tempête majeure/sévère | 01% | 01% | 05% |
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