Corrected Geomagnetic Coordinates

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Дата изменения: Fri Aug 8 20:31:43 1997
Дата индексирования: Tue Oct 2 11:48:57 2012
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The corrected geomagnetic coordinates were introduced by B.Hultquist and Gustafsson [1960].

For the corrected geomagnetic latitude (CORLAT),co-latitude (CORCOLAT), longitude (CORLON) and local time (CORMLT) calculation the algorithm as follows is used:

Step 1: The Footprint position calculation by the magnetic field line tracing from the satellite position up to the Ionosphere by using IGRF + Tsyganenko [1987] magnetic field model (the stop trace altitude 110 km).
Step 2: Tracing back from the Footprint (produced on the Step 1) to the dipole equatorial plane (by using only IGRF magnetic field model up to the geocentric distance 8 RE and dipole field model after this distance).
Step 3: The CORLON and CORMLT of the original point are equal to the dipole longitude and local time of the point, produced on the step 2.
Step 4: The CORLAT is found from the equation: (cos CORLAT)**2=1/L. where L (measured in the Earth's Radii Re = 6371.2 km) is the geocentric distance of the point produced on the step 2.
Corrected geomagnetic co-latitude CORCOLAT is the diference: (90 deg - CORLAT).

References

Hultquist,B.,and G.Gustafsson, On the magnetic time dependence of auroral zone currents, J.Atmos. Terr.,Phys., 19, 246, 1960
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The main magnetic field IGRF WWW site http://fdd.gsfc.nasa.gov/IGRF.html
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Tsyganenko N.A., Global quantitative models of the geomagnetic field in the cislunar magnetosphere for different disturbance levels, Planet.Space Sci., 35, 1347-1358, 1987.
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Dr. Victoria Prokhorenko
vprokhor@iki.rssi.ru

Last updated 08 August 1997