Viewing archive of Sunday, 9 December 2001

Solar activity report

Report of Solar-Geophysical Activity 2001 Dec 09 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 343 Issued at 2200Z on 09 Dec 2001

IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z

Solar activity has been low during the past 24 hours. Region 9727 (S20W10) produced today's largest flare: a C6/1f at 1541 UTC. There were several additional C-class flares during the day: most of these were from Regions 9727 and 9733 (N14E58). However, a C2 flare at 0421 UTC was observed to originate from the southeast limb and was associated with a narrow-width CME. The region subsequently rotated into view and was assigned 9734 (S12E81). Region 9727 showed some growth today with the development of spots north of the dominant leader spot.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate during the next three days. The main sources for activity are expected to be Region 9727 and Region 9733.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
The geomagnetic field was quiet during the past 24 hours.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be mostly unsettled for the next two days. Quiet to unsettled levels are expected on the third day.
III. Event Probabilities 10 Dec to 12 Dec
Class M 60%60%60%
Class X 10%10%10%
IV. Penticton 10.7 cm Flux
  Observed       09 Dec 224
  Predicted    10 Dec-12 Dec  215/210/210
  90 Day Mean        09 Dec 219
V. Geomagnetic A Indices
  Observed Afr/Ap 08 Dec  007/005
  Estimated     Afr/Ap 09 Dec  007/004
  Predicted     Afr/Ap 10 Dec-12 Dec  012/012-010/010-007/008
VI. Geomagnetic Activity Probabilities 10 Dec to 12 Dec
A. Middle Latitudes
Minor storm 15%10%10%
Major-severe storm 05%01%01%
B. High Latitudes
Minor storm 20%15%15%
Major-severe storm 05%01%01%

<< Go to daily overview page

Latest news


A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!


Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/09/28Kp5 (G1)
Number of spotless days in 2019:210
Current stretch spotless days:12

This day in history*

Solar flares
*since 1994

Social networks