The Gabon international completed his transfer to the Gunners on deadline day, following his former Borussia Dortmund team-mate Mkhitaryan to north London.
"I'm really happy [to be at the same club as Micki again]," Aubameyang told Arsenal Player after completing his £56m move this week.
"He's really like a brother, a good friend, and we've played together in the past. I'm really happy to see him again.
“He called me a few times and he asked me, 'Will you come or not?' and I said, 'First you have to tell me if you sign or not!' Then he told me it was all done, and of course it was a big factor in coming here.
“I think we understand each other on and off the pitch. I think that's why it's a little bit easier on the pitch."