Viewing archive of Friday, 31 December 2004

Solar activity report

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.
Report of Solar-Geophysical Activity 2004 Dec 31 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 366 Issued at 2200Z on 31 Dec 2004

IA. Analysis of Solar Active Regions and Activity from 30-2100Z to 31-2100Z

Solar activity was at moderate levels today. Region 715 (N04E34) produced an M4/2n event that occurred at 30/2218Z along with an associated Tenflare (230 sfu), a Type IV spectral radio sweep, and a Type II spectral radio sweep with an estimated shock velocity of 1378 km/s. A related CME was observed on LASCO imagery which appears to have a slight Earth directed component. A more recent M1 x-ray flare occurred at 31/1445Z from this region, and due to insufficient data, it is uncertain whether this flare produced a CME. White light analysis has shown a decay in sunspot area over the period although a small delta magnetic structure can be seen in the southern most cluster of the penumbral spots. The remainder of the disk/limbs were quiescent today. A new region was numbered today as Region 717 (N07W56).
IB. Solar Activity Forecast
Solar activity is expected to be at low to moderate levels. Region 715 remains capable of producing M-class flare activity.
IIA. Geophysical Activity Summary 30-2100Z to 31-2100Z
The geomagnetic field was at quiet to unsettled levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels through day one (1 Jan) of the period. A recurrent high speed coronal hole stream and the CME's that occurred yesterday in response to the M2/Sf event and the M4/2n event that occurred today should induce active to minor storm conditions on days two and three (2-3 Jan).
III. Event Probabilities 01 Jan to 03 Jan
Class M60%50%50%
Class X10%10%10%
Proton05%05%05%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       31 Dec 099
  Predicted   01 Jan-03 Jan  100/100/095
  90 Day Mean        31 Dec 105
V. Geomagnetic A Indices
  Observed Afr/Ap 30 Dec  012/015
  Estimated     Afr/Ap 31 Dec  008/009
  Predicted    Afr/Ap 01 Jan-03 Jan  008/012-015/020-015/015
VI. Geomagnetic Activity Probabilities 01 Jan to 03 Jan
A. Middle Latitudes
Active20%35%35%
Minor storm01%15%15%
Major-severe storm01%05%05%
B. High Latitudes
Active25%40%35%
Minor storm05%20%15%
Major-severe storm01%10%05%

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