Affichage des archives de samedi, 21 avril 2012
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 2012 Apr 21 2200 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 112 publié à 2200Z le 21 Apr 2012IA. Analyse des régions solaires actives et activité du 20-2100Z au 21-2100Z Solar activity was low. Regions 1460 (N16W27 -
Dkc/beta) and 1465 (S17E27 - Dso/beta) each produced a low-level
C-class flare. Region 1460 showed minor interior spot growth and
some mixed polarities in its trailer portion. Minor interior spot
growth also occurred in Region 1465 as well as penumbral growth in
its trailer. Region 1459 (S14W13 - Eac/beta) showed penumbral growth
in its interior portion and maintained a simple beta magnetic
configuration. No Earth-directed CMEs were observed during the
period. No new regions were numbered.
IB. Prévisions d'activité solaire
Solar activity is expected to be low
during the period (22 - 24 April) with a chance for an isolated
M-class flare.
IIA. Résumé de l'activité géophysique du 20-2100Z au 21-2100Z
Geomagnetic field activity was at quiet levels until around 21/1900Z,
then increased to quiet to unsettled levels. The increase was
associated with a weak interplanetary shock (IPS) passage, detected
at ACE at around 21/1611Z, and followed by a weak geomagnetic field
response at around 21/1712Z (no Sudden Geomagnetic Impulse
observed). ACE solar wind data showed a change to mostly southward
IMF Bz following the IPS passage (maximum deflections to -8 nT) as
well as a gradual increase in IMF Bt (peaks to 9 nT). A minor
increase in wind speeds also followed the IPS passage. It is likely
the CME passage was associated with the partial-halo CME observed on
18 April.
IIB. Prévision de l'activité géophysique
Geomagnetic field activity is
expected to be at quiet to unsettled levels during the period (22 -
24 April) with a chance for active levels. Weak CME-passage effects
are expected during 22 - 23 April (another CME is expected to arrive
late on 22 April). A recurrent coronal hole high-speed stream is
expected to become geoeffective on 24 April.
III. Probabilité d'éruption solaire du 22 Apr au 24 Apr
| Classe M | 30% | 30% | 30% |
| Classe X | 01% | 01% | 01% |
| Proton | 01% | 01% | 01% |
| PCAF | green | ||
IV. Flux Penticton 10.7 cm
Observé 21 Apr 149 Prévisionnel 22 Apr-24 Apr 150/150/145 Moyenne des 90 derniers jours 21 Apr 112
V. Indice géomagnetique A
Observé Afr/Ap 20 Apr 007/008 Estimé Afr/Ap 21 Apr 006/007 Prévisionnel Afr/Ap 22 Apr-24 Apr 011/012-010/010-010/010
VI. Probabilités d'activité géomagnétique du 22 Apr au 24 Apr
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 20% | 20% | 25% |
| Tempête mineure | 10% | 10% | 15% |
| Tempête majeure/sévère | 01% | 01% | 01% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 25% | 25% | 35% |
| Tempête mineure | 15% | 15% | 25% |
| Tempête majeure/sévère | 05% | 05% | 10% |
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