Affichage des archives de samedi, 29 septembre 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 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 2001IA. Analyse des régions solaires actives et activité du 28-2100Z au 29-2100Z Solar activity has been moderate. Two M1/1f flares
were observed -- the first at 28/2125 UTC from Region 9634 (N12W15),
and the second a long duration event at 29/1106 UTC from Region 9636
(N13W02). For the latter event, SOHO/LASCO imagery suggests an
associated faint halo with an earthward-directed component possible.
Region 9628 (S17W62), the largest on the visible disk, also
produced several optical flares with strong C-level enhancements
throughout the first half of the period. New Region 9642 (N03E70)
was numbered today.
IB. Prévisions d'activité solaire
Solar activity is expected to be
predominantly moderate over the next three days. Isolated major
flares are possible, particularly from Region 9628 and nearby Region
9632 (S18W48).
IIA. Résumé de l'activité géophysique du 28-2100Z au 29-2100Z
Geomagnetic field activity has been quiet to active. A 17 nT sudden
impulse was observed on the Boulder magnetometer at 29/0940 UTC,
preceded by an earlier shock passage observed on the ACE satellite.
Several active periods occurred through the remainder of the day.
Solar wind speed remains elevated and IMF signatures suggest the
predominant influence of a coronal hole high speed stream. The
proton event which began on 25 September remains in progress but
continues to wane, with current 10MeV flux levels at about 25 pfu.
IIB. Prévision de l'activité géophysique
The geomagnetic field is
expected to be predominantly active for the next two days, under the
combined influence of high speed stream effects and possible
transient shock passages from the CME activity of 28 September.
Isolated minor storm conditions may occur at higher latitudes during
this period. Today's CME activity may further result in additional
shock passage effects on day three. The proton event in progress is
expected to end within the next 24 to 36 hours, barring further
enhancement from any major flares.
III. Probabilité d'éruption solaire du 30 Sep au 02 Oct
| Classe M | 80% | 80% | 80% |
| Classe X | 25% | 25% | 25% |
| Proton | 99% | 50% | 20% |
| PCAF | yellow | ||
IV. Flux Penticton 10.7 cm
Observé 29 Sep 240 Prévisionnel 30 Sep-02 Oct 240/240/235 Moyenne des 90 derniers jours 29 Sep 175
V. Indice géomagnetique A
Observé Afr/Ap 28 Sep 010/013 Estimé Afr/Ap 29 Sep 015/020 Prévisionnel Afr/Ap 30 Sep-02 Oct 020/030-020/020-018/018
VI. Probabilités d'activité géomagnétique du 30 Sep au 02 Oct
| A. Latitudes moyennes | |||
|---|---|---|---|
| Actif | 30% | 30% | 25% |
| Tempête mineure | 15% | 15% | 10% |
| Tempête majeure/sévère | 10% | 10% | 10% |
| B. Hautes latitudes | |||
|---|---|---|---|
| Actif | 35% | 35% | 30% |
| Tempête mineure | 20% | 20% | 15% |
| Tempête majeure/sévère | 15% | 10% | 10% |
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