Affichage des archives de jeudi, 29 septembre 2011
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 2011 Sep 29 2200 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 272 publié à 2200Z le 29 Sep 2011IA. Analyse des régions solaires actives et activité du 28-2100Z au 29-2100Z Solar activity has been low for the past 24 hours.
Region 1305 (N13E16) has grown in aerial coverage and is now
considered a Cso-type spot group with a beta-gamma magnetic
configuration. The region produced a C1 event at 29/1023Z. Region
1302 (N13W16) produced a long duration C2/Sf at 29/1247Z. A Type II
Radio Sweep with an estimated speed of 608 km/s was associated with
this event. It is difficult to see in STEREO COR2 imagery but does
appear to be Earth directed with an estimated plane-of-sky speed of
628 km/s. Further analysis will be done as LASCO imagery becomes
available.
IB. Prévisions d'activité solaire
Solar activity is expected to be low
for the next three days (30 September - 02 October) with a chance
for isolated M-class and X-class events mainly from Region 1302.
IIA. Résumé de l'activité géophysique du 28-2100Z au 29-2100Z
The geomagnetic field was mostly unsettled with isolated minor to
major storm levels observed between 29/0000-0600Z due to
substorming. Solar wind speeds jumped slightly to 600 km/s, in
conjunction with an increase in temperature and density around
29/0030Z. Bt reached +13 nT and Bz dipped south with a maximum
deviation of -10 nT.
IIB. Prévision de l'activité géophysique
The geomagnetic field is
expected to be quiet to unsettled with a chance for isolated active
periods early on day one (30 September) due to residual effects from
the CME. Quiet to unsettled conditions are expected on day two (01
October) due to the arrival of a recurrent coronal hole high speed
stream. Quiet to unsettled conditions are expected on day three (02
October).
III. Probabilité d'éruption solaire du 30 Sep au 02 Oct
| Classe M | 60% | 60% | 60% |
| Classe X | 30% | 30% | 30% |
| Proton | 15% | 15% | 15% |
| PCAF | green | ||
IV. Flux Penticton 10.7 cm
Observé 29 Sep 137 Prévisionnel 30 Sep-02 Oct 140/140/140 Moyenne des 90 derniers jours 29 Sep 110
V. Indice géomagnetique A
Observé Afr/Ap 28 Sep 013/024 Estimé Afr/Ap 29 Sep 015/015 Prévisionnel Afr/Ap 30 Sep-02 Oct 010/012-008/010-005/005
VI. Probabilités d'activité géomagnétique du 30 Sep au 02 Oct
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 20% | 10% | 05% |
| Tempête mineure | 05% | 01% | 01% |
| Tempête majeure/sévère | 01% | 01% | 01% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 25% | 10% | 05% |
| Tempête mineure | 05% | 05% | 01% |
| Tempête majeure/sévère | 01% | 01% | 01% |
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