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  • GeoMagSphere Web Calculators

GeoMagSphere data sets and results can be freely downloaded or copied. However, the user should make the appropriate acknowledgment or citation, e.g., see  Citations or Bibliography  pages. The data generated by using the Calculator may be used by GeoMagSphere developers for statistical purpose.

  • L-Shell

This page enables users to calculate the L-Shell (or McIlwain) parameter for any particle and for any position. The L-Shell parameter is calculated in the shifted tilted dipole approximation, with the simple formula you can find here, using the updated IGRF-13 last parameters (


To perform the L-Shell Calculation please follow this link:

Input Parameters

Input values are

  • Geographical latitude (from 88 to -88 deg.)
  • Geographic longitude (from 0 to 360 deg.)
  • Altitude from the Earth's surface (in km)
  • Time (year,month,day,hour,min,sec)


Output Parameters


Ouputs are:

  • L-Shell parameter (in unit of Earth radii)


Lshell Dipole