We will soon be producing a lot of data on a HEALPix (Hierarchical Equal Area isoLatitude Pixelation) grid. The grid coordinates can be calculated easily from 2 parameters. The NSIDE parameter controls the resolution of the pixellization and the ORDER parameter sets the index ordering convention of the pixels (ring or nested).
I think it would be good to have a convention for storing these parameters in NetCDF. My idea is to define these parameters via the grid_mapping attribute, for example:

dimensions:
	cells = 49152 ;
variables:
	int healpix ;
		healpix:grid_mapping_name = "healpix" ;
		healpix:healpix_nside = 64 ;
		healpix:healpix_order = "nested" ;
	float var(cells) ;
		var:grid_mapping = "healpix" ;

This defines a HEALPix grid with nside=64 and a nested index ordering.
Can this be taken over into the CF Convention or do you have a better suggestion?