Viewing archive of Sunday, 16 December 2001

Solar activity report

Report of Solar-Geophysical Activity 2001 Dec 16 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 350 Issued at 2200Z on 16 Dec 2001

IA. Analysis of Solar Active Regions and Activity from 15-2100Z to 16-2100Z

Solar activity increased to moderate levels. Region 9733 (N14W36) remained the most active sunspot group on the disk. It produced two M-class flares: an M1/2N at 16/0124 UTC and an M1/1f at 16/0328 UTC. Minor radio emission accompanied both flares. Region 9733 decreased slightly in area and magnetic complexity and appeared to lose the magnetic delta configuration within its northernmost spots. However, it retained a moderately complex beta-gamma magnetic classification. Region 9739 (S13W43) appeared to be in a gradual growth phase, but remained simply structured. Region 9742 (N08E64) produced isolated subflares during the period. Magnetogram images suggest this region may possess a moderate degree of magnetic complexity, though it is difficult to gauge given its limb proximity. New Region 9743 (S10E73) produced isolated subflares as it rotated into view. It may represent the return of old Region 9714 (S08, L = 195), which produced M-class flares during its last rotation. New Region 9744 (S06E24) was also numbered.
IB. Solar Activity Forecast
Solar activity is expected to be moderate to high. Isolated, low-level M-class flares are likely. Region 9733 may produce a major flare during the period.
IIA. Geophysical Activity Summary 15-2100Z to 16-2100Z
Geomagnetic field activity was at quiet to unsettled levels.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is expected to remain at quiet to unsettled levels. There will be a chance for a proton flare from Region 9733.
III. Event Probabilities 17 Dec to 19 Dec
Class M75%75%75%
Class X10%10%10%
IV. Penticton 10.7 cm Flux
  Observed       16 Dec 209
  Predicted   17 Dec-19 Dec  205/200/195
  90 Day Mean        16 Dec 219
V. Geomagnetic A Indices
  Observed Afr/Ap 15 Dec  010/011
  Estimated     Afr/Ap 16 Dec  010/012
  Predicted    Afr/Ap 17 Dec-19 Dec  010/010-008/008-008/008
VI. Geomagnetic Activity Probabilities 17 Dec to 19 Dec
A. Middle Latitudes
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Minor storm10%10%10%
Major-severe storm01%01%01%

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