 In addition, an uninvited observation ship from the Soviet Union was stationed near Johnston Island for the test and another Soviet scientific expeditionary ship was located in the southern conjugate region, permanent features of all future oceanic nuclear testing.After the "Starfish Prime" detonation, bright auroras were observed in the detonation area as well as in the southern conjugate region on the other side of the equator from the detonation.According to one of the first technical reports, "The visible phenomena due to the burst were widespread and quite intense; a very large area of the Pacific was illuminated by the auroral phenomena, from far south of the south magnetic conjugate area (Tongatapu) through the burst area to far north of the north conjugate area (French Frigate Shoals).