> Sao Paulo Brazil especially. <
Magnetic anomalies? You might be overthinking this.
I’m guessing the UFO drivers are just admirers of women who wear Brazilian-style bikinis. Such bikinis have minimal coverage at the back, and often resembling a thong.
(I decided not to post a picture of one. Deletion fear runs strong with me.)
https://watchers.news/2020/05/20/swarm-weakening-earth-magnetic-field-split-up-south-atlantic-anomaly/