It created a massive Electromagnetic Pulse (EMP) that knocked out streetlights in Hawaii, 900 miles away, and created an artificial radiation belt around the Earth that damaged several satellites. Safety Warning for Archive Files
If you need historical data on Starfish Prime, it is much safer to use official government archives like the National Security Archive or the DTRA (Defense Threat Reduction Agency) rather than unverified rar files. Recommended Research Sources StarfishPrime part1.rar - AnonFiles
If you are writing about this topic or researching the technical data, I recommend looking for: It created a massive Electromagnetic Pulse (EMP) that
Scientific papers detailing how the blast affected the ionosphere. 900 miles away
Archives can contain "zip bombs" or executable scripts that run as soon as they are extracted.