Viewing archive of Thursday, 13 January 2005

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 2005 Jan 13 2350 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 013 Issued at 2200Z on 13 Jan 2005

IA. Analysis of Solar Active Regions and Activity from 12-2100Z to 13-2100Z

Solar activity was low. Region 718 (S07E07) produced several C-class flares; the largest was a C4.2/Sf flare at 13/1712. Region 720 (N13E24) has shown significant growth in area and sunspot number, however, only low level B-class activity has been associated with the region thus far. This region is now 1080 millionths with a beta delta magnetic configuration.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate levels with a slight chance for X-class events. Energetic activity is possible from Region 720 due to its rapid development.
IIA. Geophysical Activity Summary 12-2100Z to 13-2100Z
The geomagnetic field was quiet to active. Active conditions were due to the persistence of a high speed stream. The solar wind speed at ACE has decreased from approximately 720 km/s to 650 km/s during the past 24 hours. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to unsettled.
III. Event Probabilities 14 Jan to 16 Jan
Class M60%60%60%
Class X15%15%15%
IV. Penticton 10.7 cm Flux
  Observed       13 Jan 116
  Predicted   14 Jan-16 Jan  120/120/125
  90 Day Mean        13 Jan 106
V. Geomagnetic A Indices
  Observed Afr/Ap 12 Jan  018/030
  Estimated     Afr/Ap 13 Jan  010/014
  Predicted    Afr/Ap 14 Jan-16 Jan  008/015-005/008-005/008
VI. Geomagnetic Activity Probabilities 14 Jan to 16 Jan
A. Middle Latitudes
Minor storm05%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Minor storm10%10%10%
Major-severe storm01%01%01%

All times in UTC

<< 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!

Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/06/10X1.55
Last M-flare2024/06/20M1.1
Last geomagnetic storm2024/06/15Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
May 2024171.7 +35.2
June 2024158.4 -13.3
Last 30 days147.6 -15

This day in history*

Solar flares
*since 1994

Social networks