Geophysical report

Viewing archive of Thursday, 20 January 2005

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.

:Product: 20050120SGAS.txt :Issued: 2005 Jan 20 0250 UT Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Solar and Geophysical Activity Summary

SGAS Number 020 Issued at 0245Z on 20 Jan 2005 This report is compiled from data received at SWO on 19 Jan

A. Energetic Events

Begin  Max  End  Rgn   Loc   Xray  Op 245MHz 10cm   Sweep
 0510 0526 0535  0720 N12W44 C7.2  Sf        3500                   
 0658 0731 0755  0720 N19W47 M6.7  2n        5000                   
 0803 0822 0840  0720        X1.3                   II/IV           
 1019 1024 1029  0720 N18W47 M2.7  1n 1400   2900                   
 1250 1251 1345                       65     150                    
 1532 1540 1548  0720 N13W50 M1.6  2f                               
 2132 2132 2132                       370                           
 2151 2151 2151                       100                           
 2207 2207 2207                       140                           
 2210 2210 2212                       170

B. Proton Events

The greater than 100 MeV proton event has ended: start 17/1215 UTC, 28 pfu peak at 17/1700 UTC, and end 18/2205 UTC. The greater than 10 MeV proton event remains in progress but is decaying: start 16/0210 UTC and 5040 pfu peak at 17/1750 UTC. Proton fluxes have decreased enough for the GOES electron sensors and ACE SWEPAM instruments to again provide reliable data.

C. Geomagnetic Activity Summary

The geomagnetic disturbance remained in progress at the unsettled to severe storm level.

D. Stratwarm

None

E. Daily Indices: (real-time preliminary/estimated values)

10 cm 133  SSN 066  Afr/Ap 045/062   X-ray Background B6.8
Daily Proton Fluence (flux accumulation over 24 hrs)
GT 1 MeV 1.1e+08   GT 10 MeV 8.2e+06 p/(cm2-ster-day)
(GOES-11 satellite synchronous orbit W107 degrees)
Daily Electron Fluence
GT 2 MeV 4.40e+08 e/(cm2-ster-day)
(GOES-12 satellite synchronous orbit W75 degrees)
3 Hour K-indices
Boulder 5 6 5 6 5 5 3 3 Planetary 6 6 6 7 6 4 3 4

F. Comments

  The Afr index reported in Part E is estimated from
Boulder observations.

All times in UTC

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G2 - Moderate geomagnetic storm

Observed Kp: 6
Threshold reached: 22:29 UTC

Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Tórshavn
Reykjavik
Trondheim

The solar wind speed is currently moderately high (603 km/sec.)

The strength of the interplanetary magnetic field is high (22.65nT), the direction is North (13.39nT).

The Disturbance Storm Time index predicts moderate storm conditions right now (-63nT)

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