Affichage des archives de jeudi, 27 septembre 2007
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 2007 Sep 27 2203 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 270 publié à 2200Z le 27 Sep 2007IA. Analyse des régions solaires actives et activité du 26-2100Z au 27-2100Z Solar activity was very low. No flares occurred during
the past 24 hours.
IB. Prévisions d'activité solaire
Solar activity is expected to be very
low.
IIA. Résumé de l'activité géophysique du 26-2100Z au 27-2100Z
The geomagnetic field was initially quiet. However, a weak shock was
seen at ACE at 1054Z, followed by an increase in magnetic field
strength and density as well as a small increase in velocity. There
were some extended intervals of southward Bz and as a result there
was a period of minor to major storm level activity from 1500-1800Z.
Conditions declined to active to minor storm levels for remainder of
the period (1800-2100Z). Although the observations are not yet
conclusive the disturbance appears to be from a transient structure
in the solar wind, rather than from a recurrent structure. The
greater than 2 MeV electron flux at geosynchronous orbit reached
high levels during the past 24 hours.
IIB. Prévision de l'activité géophysique
The geomagnetic field is
expected to be unsettled with occasional active periods for the
first day (28 September) due to the anticipated onset of a high
speed stream from a coronal hole. Activity should strengthen on the
second day (29 September) to predominantly active levels with a
chance for minor storm periods at high latitudes. Conditions should
decline to predominantly unsettled levels on the third day (30
September).
III. Probabilité d'éruption solaire du 28 Sep au 30 Sep
| Classe M | 01% | 01% | 01% |
| Classe X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Flux Penticton 10.7 cm
Observé 27 Sep 067 Prévisionnel 28 Sep-30 Sep 067/067/067 Moyenne des 90 derniers jours 27 Sep 069
V. Indice géomagnetique A
Observé Afr/Ap 26 Sep 002/003 Estimé Afr/Ap 27 Sep 010/015 Prévisionnel Afr/Ap 28 Sep-30 Sep 010/015-020/025-010/012
VI. Probabilités d'activité géomagnétique du 28 Sep au 30 Sep
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 40% | 40% | 30% |
| Tempête mineure | 15% | 25% | 15% |
| Tempête majeure/sévère | 05% | 10% | 05% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 45% | 45% | 35% |
| Tempête mineure | 20% | 25% | 20% |
| Tempête majeure/sévère | 10% | 15% | 10% |
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