WordPress at a glance
action is not described

atom_author action-hook . WP 3.2.0

Fires at the end of each Atom feed author entry.

Usage

add_action( 'atom_author', 'action_function_name_1426' );
function action_function_name_1426(){
	// action...
}

Where the hook is called

In file: /wp-includes/feed-atom.php
atom_author
wp-includes/feed-atom.php 64
do_action( 'atom_author' );

Where the hook is used (in WP core)

Does not used.