pysecs.make_image_grid

pysecs.make_image_grid(grid: ndarray, r_shell: float) → ndarray

Copy a grid’s latitude/longitude nodes onto a shell at another radius.

Useful for building a second shell at the same horizontal locations as an existing grid, e.g. an internal image shell below ground to separate induced telluric currents from the external ionospheric ones (Amm & Viljanen 1999).

Parameters:

• grid (ndarray (n, 3 [lat, lon, r])) – An existing SECS grid, e.g. from make_grid().

• r_shell (float) – The radius of the new shell.

Returns:

The same latitude/longitude nodes at radius r_shell.

Return type:

ndarray (n, 3 [lat, lon, r])