STK SEET Environment
The STK SEET Geomagnetic Field component evaluates the magnetic field and performs field-line tracing using several models for a satellite, missile, or launch vehicle. Beyond several Earth radii, the Earth's magnetic field is increasingly distorted by the solar wind interacting with the Earth's magnetosphere; the total magnetic field is therefore modeled primarily as a dipole main-field model, plus an external (magnetospheric) field model.
Flux intensity for energetic protons in the South Atlantic Anomaly (SAA) region is based on data from the Compact Environmental Anomaly Sensor (CEASE) flown onboard the Tri-Service Experiment-5 (TSX-5) satellite from 2000 to 2006 (Ginet et al., 2008). The data resolution is 3 degrees for both latitude and longitude and 50 km in altitude. The data cover the full range of latitudes and longitudes with an altitude range from 400 km through 1700 km.
For additional background information, consult: SEET: Space Environment and Effects Tool for STK (PDF).
Option | Description |
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Main Field | Options are:
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External Field |
Options are:
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IGRF Update Rate | The time period of the frequency at which IGRF harmonic model coefficients will be re-evaluated from the table of IGRF coefficients (spaced approximately every five years). |
Option | Description |
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Channel | Options for proton threshold-energy level:
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Flux Level |
Level of the boundary contour to be displayed:
For reference information, see: Energetic Proton Maps for the South Atlantic Anomaly (PDF). |
Outside the altitude range of 400 km through 1700 km, the SAA model returns zero.
Ginet, G.P., D. Madden, B.K. Dichter, D.H. Brautigam (2008), "Energetic Proton Maps for the South Atlantic Anomaly." AFRL-RV-HA-TR-2008_1060, Reprinted from Radiation Effects Data Workshop Record, 2007 IEEE Nuclear and Space Radiation Effects Conference, 23-27 Jul 2007.
Olson, W. P., and K. A. Pfitzer, Magnetospheric magnetic field modeling, Annual Scientific Report, AFOSR Contract No. F44620-75-C-0033, 1977.