seeding with silver iodide is not new, it's not secret and it's nothing to do with HAARP
The goal of HAARP is to understand the physics of the ionosphere, because solar flares occasionally disrupt communications and the electrical grid. It hasn't even been active since 2014
https://www.nature.com/news/us-ionospheric-research-facility-to-close-1.15243
(post is archived)