Guarda l'archivio di sabato, 18 ottobre 2003

Rapporto attività solare

Rapporto dell'attività geofisica solare 2003 Oct 18 2200 UTC
Preparato dal NOAA © SWPC ed elaborato da

Relazione congiunta USAF/NOAA sull'attività solare e geofisica

Numero SDF 291 rilasciato alle 2200Z il 18 Oct 2003

IA. Analisi delle regioni solari attive e delle attività dal 17-2100Z al 18-2100Z

Solar activity was low. A noticeable increase in flare activity and background levels was observed during the past 24 hours. Most of this increase was due to newly numbered Region 484 (N05E68) which appears to be a compact D-type group with 240 millionths of area. The region produced numerous C-class flares: the largest was a C4.9 at 1653 UTC. A partial halo CME was observed off the southeast limb, beginning at 1554 UTC. The plane of sky velocity was estimated to be about 700 km/s. Region 483 (S08E55) was assigned today but so far is a small stable sunspot group. The other active regions on the disk showed occasional brightenings but were mostly quiet and stable.
IB. Previsione dell'Attività Solare
Solar activity is expected to be low for the next three days with Region 484 as the dominant source of activity. There is a slight chance for an isolated M-class event during the next three days.
IIA. Sommario dell'Attività Geofisica dal 17-2100Z al 18-2100Z
The geomagnetic field ranged from unsettled to minor storm levels as the high speed solar wind stream continues. The solar wind speed did not show any trend today and the average velocity was around 540 km/s. The interplanetary magnetic field Z-component fluctuated between -7 nT and + 5 nT but was weakly negative on average. The greater than 2 MeV electron fluxes were at high levels during the past 24 hours.
IIB. Previsione dell'Attività Geofisica
The geomagnetic field is expected to be unsettled to active for the next 24 hours. There should be a gradual decline in activity sometime tomorrow and conditions should be mostly unsettled for the second day. An increase to mostly active with some minor storm periods is expected on the third day as a new coronal hole rotates into favorable position at that time. Today's CME is not expected to directly impact Earth but might result in a glancing blow that could provide a boost to activity on the third day.
III. Probabilità di evento 19 Oct to 21 Oct
Classe M20%20%20%
Classe X01%01%01%
IV. Penticton 10.7 cm Flux
  Osservato       18 Oct 109
  Previsto   19 Oct-21 Oct  115/115/120
  Media di 90 giorni        18 Oct 116
V. Indici Geomagnetici A
  Osservato Afr/Ap 17 Oct  020/031
  Stimato     Afr/Ap 18 Oct  017/025
  Previsto    Afr/Ap 19 Oct-21 Oct  012/020-012/015-020/030
VI. Probabilità di Attività Geomagnetica dal 19 Oct al 21 Oct
A. Medie Latitudini
Tempesta minore25%25%40%
Tempesta maggiore intensa05%05%15%
B. Alte Latitudini
Tempesta minore25%25%30%
Tempesta maggiore intensa05%05%35%

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