Affichage des archives de samedi, 28 avril 2001
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 2001 Apr 28 2200 UTCFait par le NOAA © SWPC et adapté par SpaceWeatherLive.com
Rapport de l'USAF/NOAA sur l'activité solaire et géophysique
SDF numéro 118 publié à 2200Z le 28 Apr 2001IA. Analyse des régions solaires actives et activité du 27-2100Z au 28-2100Z Solar activity dropped to low levels. Region 9433
(N17W50) produced isolated C-class flares, the largest of which was
a C7/1f at 28/0934 UTC. Gradual decay continued in the leading and
intermediate portions of this region. However, no decay was evident
within its trailing spots, where a strong magnetic delta
configuration remained. Region 9441 (N07E23) continued a gradual
growth phase that began on 27 April, but the region remained a
moderate-sized, simply-structured bipole. New Regions 9444 (S11E67)
and 9445 (N23E76) were assigned.
IB. Prévisions d'activité solaire
Solar activity is expected to be at
moderate to high levels. Region 9433 is expected to produce isolated
M-class flares. This region could also produce an isolated major
flare during the period.
IIA. Résumé de l'activité géophysique du 27-2100Z au 28-2100Z
Geomagnetic field activity ranged from quiet to minor storm levels.
An interplanetary shock at the leading edge of a CME passed the ACE
spacecraft at 28/0432 UTC, followed by a sudden impulse (SI) at
28/0520 UTC (76 nT, as measured by the Boulder USGS magnetometer).
The source for the CME was an M7/2b flare on 26 April. Field
activity increased to unsettled to minor storm levels following the
SI. The greater than 10 MeV proton flux at geosynchronous orbit
briefly crossed event threshold in response to the shock passage.
The greater than 10 MeV event began at 28/0430 UTC, reached a
maximum of 57 PFU at 28/0500 UTC, then ended at 28/0520 UTC. Proton
fluxes had decreased to near background levels by the close of the
period.
IIB. Prévision de l'activité géophysique
Geomagnetic field activity is
expected to be at unsettled to active levels through midday, 29
April as the disturbance gradually subsides. Quiet to unsettled
levels are expected for the remainder of the period. Region 9433
could produce another proton flare before it crosses the west limb
on 02 May. The greater than 2 MeV electron flux at geosynchronous
orbit may reach high levels during the first half of the period.
III. Probabilité d'éruption solaire du 29 Apr au 01 May
| Classe M | 75% | 75% | 75% |
| Classe X | 20% | 20% | 20% |
| Proton | 20% | 20% | 20% |
| PCAF | yellow | ||
IV. Flux Penticton 10.7 cm
Observé 28 Apr 188 Prévisionnel 29 Apr-01 May 185/180/175 Moyenne des 90 derniers jours 28 Apr 167
V. Indice géomagnetique A
Observé Afr/Ap 27 Apr 003/006 Estimé Afr/Ap 28 Apr 026/028 Prévisionnel Afr/Ap 29 Apr-01 May 015/015-012/010-010/010
VI. Probabilités d'activité géomagnétique du 29 Apr au 01 May
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 30% | 25% | 20% |
| Tempête mineure | 15% | 10% | 10% |
| Tempête majeure/sévère | 10% | 05% | 01% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 35% | 30% | 25% |
| Tempête mineure | 20% | 15% | 10% |
| Tempête majeure/sévère | 15% | 10% | 05% |
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