Het archief bekijken van woensdag 26 september 2001


Rapport van de zonne- en geofysische activiteit van 2001 Sep 26 2200 UTC
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USAF/NOAA rapport van de zonneactiviteit en geofysische activiteit

SDF Nummer 269 gepubliceerd omstreeks 2200Z op 26 Sep 2001

IA. Analyse van de actieve zonneregio's en zonneactiviteit van 25-2100Z tot 26-2100Z

Solar activity has been moderate. Region 9628 (S18W26) produced today's only M-class event, an M1 at 0258 UTC. The region has shown a slight decline and simplification relative to yesterday, but continues to be the largest on the disk and continues to have strong, complex magnetic fields. Region 9632 (S19W08) also continues to be impressive but produced only low-level C-class events. Region 9636 (N13E40) appears to be growing slowly and managed to produce a couple subflares. New Region 9639 (N04E36) was assigned today and is a simple beta-type sunspot group.
IB. Voorspelling zonneactiviteit
Solar activity is expected to be moderate. There is a fair chance, however, for an isolated major flare event or proton producing event from either of Regions 9632 or 9628.
IIA. Samenvatting geofysische activiteit 25-2100Z tot 26-2100Z
The geomagnetic field has ranged from quiet to major storm levels during the past 24 hours. Following yesterday's sudden storm commencement at 2025 UTC, the geomagnetic field became disturbed, and attained major storm levels between 2100-2400 UTC. Conditions declined slightly from 0000-1200 UTC, with active to minor storm levels predominating. Activity was quiet to unsettled for the remainder of the period. The greater than 10 MeV proton event continues in progress. A maximum flux of 12900 pfu was observed at 25/2235 UTC, after which the flux levels have been steadily declining. The greater than 100 MeV proton event that began at 1440 UTC on the 24th attained maximum of 31 PFU at 25/0755 UTC and ended at 26/1940 UTC.
IIB. Voorspelling geofysische activiteit
The geomagnetic field is expected to be mostly unsettled during the next three days. There is a chance for some active periods during the next 12 hours due to persistence. Unsettled levels should dominate on the second day. There is a chance for some active periods on the third day due to the favorable position of a solar coronal hole. The greater than 10 MeV proton event is expected to continue for the next 42-48 hours.
III. Kans zonnevlammen van 27 Sep tot 29 Sep
Klasse M80%80%80%
Klasse X30%30%30%
PCAFin progress
IV. Penticton 10.7 cm Flux
  Geobserveerd       26 Sep 283
  Voorspeld   27 Sep-29 Sep  280/275/275
  90 Day Mean        26 Sep 171
V. Geomagnetische A index
  Geobserveerd Afr/Ap 25 Sep  017/018
  Verwacht     Afr/Ap 26 Sep  022/025
  Voorspeld    Afr/Ap 27 Sep-29 Sep  015/010-010/010-015/015
VI. Kansen geomagnetische activiteit van 27 Sep tot 29 Sep
A. Gemiddelde breedtegraad
Kleine stormcondities20%15%25%
Zware-ernstige stormcondities10%05%10%
B. Hoge breedtegraad
Kleine stormcondities20%15%30%
Zware-ernstige stormcondities15%05%20%

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