Trigger action whenever session is updated, on application restart

I am using ember-simple-auth (and ember-simple-auth-token, but I think this is not relevant). Whenever a logged-in user reloads the page, the session is properly re-created. I have one problem, though: when the user enters the credentials, I am running this code:

// controllers/login.js

import Ember from 'ember';

import helpers from '../lib/helpers';

function refreshActiveUser(store, session) {
    store.find('user', 'me').then(function(user) {
        Ember.set(session, 'activeUser', user);
    });
}

export default Ember.Controller.extend({
    session: Ember.inject.service('session'),
    actions: {
        authenticate: function() {
            var identification = this.get('model.identification'),
                password = this.get('model.password'),
                authenticator = 'authenticator:token',
                store = this.get('store'),
                session = this.get('session');
            session.authenticate(authenticator, {identification, password}).then(function() {
                refreshActiveUser(store, session);
            });
        }
    },
});

But I do not know how to trigger my refreshActiveUser on application reload. How can I listen to a "session initialized" event?