Viewing archive of Thursday, 21 December 2006

Solar activity report

Report of Solar-Geophysical Activity 2006 Dec 21 2204 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 355 Issued at 2200Z on 21 Dec 2006

IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z

Solar activity continues at very low levels. There are currently no sunspots on the visible disk.
IB. Solar Activity Forecast
Solar activity is expected to continue at very low levels. Old Region 926 (S09, L=138) is due to return to the visible disk tomorrow, and may slightly increase activity levels.
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field was at quiet to active levels, with isolated minor storm periods at high latitudes. A high speed coronal hole stream is responsible for the disturbed periods. Solar wind speed is in slow decline and ended the period near 600 km/s. The greater than 2 MeV electrons at geosynchronous orbit were at high levels again today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to active on 22 and 23 December, with isolated minor storm periods at higher latitudes. Quiet to unsettled levels with isolated active periods are expected on 24 December.
III. Event Probabilities 22 Dec to 24 Dec
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       21 Dec 072
  Predicted   22 Dec-24 Dec  075/080/080
  90 Day Mean        21 Dec 081
V. Geomagnetic A Indices
  Observed Afr/Ap 20 Dec  016/024
  Estimated     Afr/Ap 21 Dec  015/018
  Predicted    Afr/Ap 22 Dec-24 Dec  012/015-010/015-008/010
VI. Geomagnetic Activity Probabilities 22 Dec to 24 Dec
A. Middle Latitudes
Active30%25%20%
Minor storm15%10%05%
Major-severe storm05%01%01%
B. High Latitudes
Active40%35%25%
Minor storm20%15%05%
Major-severe storm05%05%01%

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

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!

100%

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/10/26Kp5 (G1)
Number of spotless days in 2019:246
Current stretch spotless days:19

This day in history*

Solar flares
12012M3.5
21999M3.4
31999M2.2
42000M1.6
52012M1.4
ApG
1200250G3
2200342G3
3201727G1
4200417
5200716
*since 1994

Social networks