Some controversy still surrounds the Vela program since on 22 September 1979 the Vela 5B (also known as Vela 10 and OPS 6911) satellite detected the characteristic double flash of an atmospheric nuclear explosion near the Prince Edward Islands. Still unsatisfactorily explained, this event has become known as the Vela Incident. President Jimmy Carter initially deemed the event to be evidence of a joint Israeli and South African nuclear test, though the now-declassified report of a scientific panel he subsequently appointed while seeking reelection concluded that it was probably not the event of a nuclear explosion. An alternative explanation involves a magnetospheric event affecting the instruments.