Brief Description:
Holzworth and Meng (1975) provide a parameterization of the Feldstein (1963)
auroral ovals. Feldstein specified seven different ovals for seven levels of
magnetic activity. The model describes the Corrected Geomagnetic Latitude (CGL)
of the equatorward and polward boundaries of the oval in terms of Magnetic
Local Time (MLT). Holzworth and Meng use a seven parameter Fourier series.
Their 1975 publication includes the coefficients for the seven Feldstein
ovals. A FORTRAN program written at NSSDC computes the CGLs for given MLT
and level of magnetic activity (0-6).
Please note that coordinate conversions from geographic to corrected
geomagnetic (CGM) coordinates and vice versa can be done online at
CGM page.
Availability: FORTRAN program can be retrieved from NSSDC's anonymous FTP site.
References:
Y. I. Feldstein, On Morphology and Auroral and Magnetic Disturbances at High
Latitudes, Geomagn. Aeron. 3, 138, 1963.
R. H. Holzworth, C.-I. Meng, Mathematical Representation of the Auroral Oval, Geophys. Res. Lett. 2, 377, 1975.
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NASA Official: Dr. Robert McGuire, Head of the Space Physics Data Facility