mne.
write_forward_solution
Write forward solution to a file.
fname : str
File name to save the forward solution to. It should end with -fwd.fif or -fwd.fif.gz.
fwd : Forward
Forward solution.
overwrite : bool
If True, overwrite destination file (if it exists).
verbose : bool, str, int, or None
If not None, override default verbose level (see mne.verbose() and Logging documentation for more).
mne.verbose()
See also
read_forward_solution