The Cherries playmaker has seen his first team opportunities limited following his summer switch from non-league Woking.
Since starring in pre-season, Arter has been restricted to just 15 appearances, nine of those as a substitute, with his midfield colleagues in fine form.
In a bid to get valuable game-time, the former Charlton man has signed an initial one-month deal with Carlisle and could do Cherries a favour when the Cumbrians visit league leaders Brighton this afternoon.
Arter told the Echo: I was really pleased that a League One opportunity came up.
Carlisle are a good passing team with a lot of young players and I think I will fit it well there. Hopefully, it will be a success.
It's not the club's fault but since the middle of December I have only played three reserve games.
For any professional footballer, that is not enough. I rely on being sharp and being at my best and, if I'm not, then I'm not really that much use to anyone.
I'm hoping to go up to Carlisle and find that match sharpness I feel I'm lacking a little bit at the moment.
Cherries manager Lee Bradbury told the club's official website: Harry is definitely part of my long-term plans, but he is going out on loan because he can't break into the team.
That shows the strength in depth we have got.
We want to keep everyone happy and we felt this was a good move for him. He can come back a refreshed player and reignited.