The Vela Incident, also known as the South Atlantic Flash, was an unidentified double flash of light detected by an American Vela Hotel satellite on 22 September 1979 near the Prince Edward Islands off Antarctica. The more common theory among those who believe the flash was of nuclear origin is that it resulted from a joint South African–Israeli nuclear test. The topic has been highly disputed. In 2016, researchers from George Washington University's National Security Archive noted that the debate over the South Atlantic Flash has shifted over the last few years to the side of a man-made weapon test.
While a double-flash signal is characteristic of a nuclear weapons test in the atmosphere, the signal could also have been due to a meteoroid hitting the Vela satellite. All of the previous 41 double flashes detected by the Vela satellites were confirmed to be nuclear explosions. Some information about the event remains classified.
The "double flash" was detected on 22 September 1979, at 00:53 UTC, by the American Vela satellite OPS 6911 (also known as Vela 10 and Vela 5B), which carried various sensors designed specifically to detect nuclear explosions that contravened the Partial Nuclear Test Ban Treaty. In addition to being able to detect gamma rays, X-rays, and neutrons, the satellite also contained two silicon solid-state bhangmeter sensors that could detect the dual light flashes associated with an atmospheric nuclear explosion: the initial brief, intense flash, followed by a second, longer flash.
The satellite reported the characteristic double flash of a small atmospheric nuclear explosion of two to three kilotons, in the Indian Ocean between the Crozet Islands (a very small, sparsely inhabited French possession) and the Prince Edward Islands (which belong to South Africa) at Coordinates: . 
Other systems data, such as Sound Surveillance System (SOSUS) and Missile Impact Location System (MILS), that were established by the United States and NATO to detect Soviet submarines and the locations where used missile test warheads splashed down, respectively, was searched in an effort to gain more knowledge on the possibility of a nuclear detonation in the region. This data was found to not have enough substantial evidence of a detonation of a nuclear weapon. United States Air Force surveillance aircraft flew 25 sorties over that area of the Indian Ocean from 22 September to 29 October 1979 to carry out atmospheric sampling. Studies of wind patterns confirmed that fall-out from an explosion in the southern Indian Ocean could have been carried from there to southwestern Australia. It was reported that low levels of iodine-131 (a short-half-life product of nuclear fission) were detected in sheep in the southeastern Australian States of Victoria and Tasmania soon after the event. Sheep in New Zealand showed no such trace. The Arecibo ionospheric observatory and radio telescope in Puerto Rico detected an anomalous ionospheric wave during the morning of 22 September 1979, which moved from the southeast to the northwest, an event that had not been observed previously.
After the event was made public, the United States Department of Defense clarified that it was either a bomb blast or a combination of natural phenomena, such as lightning, a meteor, or a glint from the Sun. The initial assessment by the United States National Security Council (NSC), with technical support by the Naval Research Laboratory[page needed] in October 1979 was that the American intelligence community had "high confidence" that the event was a low-yield nuclear explosion, although no radioactive debris had been detected, and there was "no corroborating seismic or hydro-acoustic data." A later NSC report revised this position to "inconclusive" about whether or not a nuclear test had occurred. That same report concluded that if a nuclear test had been carried out, responsibility should nevertheless be ascribed to the Republic of South Africa.
The Carter Administration asked the Office of Science and Technology Policy (OSTP) to convene a panel of instrumentation experts to re-examine the Vela Hotel 6911 data, and to attempt to determine whether the optical flash detected came from a nuclear test. The outcome was important to Carter, as his presidency and 1980 re-election campaign prominently featured the themes of nuclear nonproliferation and disarmament. The SALT II treaty had been signed three months earlier, and was pending ratification by the United States Senate, and Israel and Egypt had signed the Camp David Accords six months earlier.
An independent panel of scientific and engineering experts was commissioned by Frank Press, who was the Science Advisor to president Carter and the chairman of the OSTP, to evaluate the evidence and determine the likelihood that the event was a nuclear detonation. The chairman of this science panel itself was Dr. Jack Ruina of the Massachusetts Institute of Technology, and also the former director of the U.S. Department of Defense's Advanced Research Projects Agency. Reporting in the summer of 1980, the panel noted that there were some key differences in the detected optical signature from that of an actual nuclear explosion, particularly in the ratio of intensities measured by the two detectors on the satellite. The now-declassified report contains details of the measurements made by the Vela Hotel satellite.
The explosion was picked up by a pair of sensors on only one of the several Vela satellites; other similar satellites were looking at different parts of the Earth, or weather conditions precluded them seeing the same event. The Vela satellites had previously detected 41 atmospheric tests—by countries such as France and the People's Republic of China—each of which was subsequently confirmed by other means, including testing for radioactive fallout. The absence of any such corroboration of a nuclear origin for the Vela Incident also suggested that the "double flash" signal was a spurious "zoo" signal of unknown origin, possibly caused by the impact of a micrometeoroid. Such "zoo" signals which mimicked nuclear explosions had been received several times earlier.
Their report noted that the flash data contained "many of the features of signals from previously observed nuclear explosions", but that "careful examination reveals a significant deviation in the light signature of the 22 September event that throws doubt on the interpretation as a nuclear event". The best analysis that they could offer of the data suggested that, if the sensors were properly calibrated, any source of the "light flashes" were spurious "zoo events". Thus their final determination was that while they could not rule out that this signal was of nuclear origin, "based on our experience in related scientific assessments, it is our collective judgment that the September 22 signal was probably not from a nuclear explosion".
Victor Gilinsky (former member of the Nuclear Regulatory Commission) argued that the science panel's findings were politically motivated. There was some data that seemed to confirm that a nuclear explosion was the source for the "double flash" signal. There was the "anomalous" traveling ionospheric disturbance that was measured at the Arecibo Observatory in Puerto Rico at the same time, but many thousands of miles away in a different hemisphere of the Earth. A test in Western Australia conducted a few months later found some increased nuclear radiation levels.[page needed] A detailed study done by New Zealand's National Radiation Laboratory found no evidence of excess radioactivity, and neither did a U.S. Government-funded nuclear laboratory. Los Alamos National Laboratory scientists who worked on the Vela Hotel program have professed their conviction that the Vela Hotel satellite's detectors worked properly.
Leonard Weiss, at the time Staff Director of the Senate Subcommittee on Energy and Nuclear Proliferation, has also raised concerns about the findings of the Ad-Hoc Panel, arguing that it was set up by the Carter administration to counter embarrassing and growing opinion that it was an Israeli nuclear test. Specific intelligence about the Israeli nuclear program was not shared with the panel whose report therefore produced the plausible deniability that the administration sought.
If a nuclear explosion did occur, it occurred within the 3,000-mile-wide (4,800 km diameter) circle covering parts of the Indian Ocean, the South Atlantic, the southern tip of Africa, and a small part of Antarctica.
Well before the Vela Incident, American intelligence agencies had made the assessment that Israel probably possessed its own nuclear weapons. According to journalist Seymour Hersh, the detection was the third joint Israeli-South African nuclear test in the Indian Ocean, and the Israelis had sent two IDF ships and "a contingent of Israeli military men and nuclear experts" for the test. Author Richard Rhodes also concludes the incident was an Israeli nuclear test, conducted in cooperation with South Africa, and that the United States administration deliberately obscured this fact in order to avoid complicating relations with South Africa. Likewise, Leonard Weiss offers a number of arguments to support the test being Israeli, and claims that successive U.S. administrations continue to cover up the test to divert unwanted attention that may portray its foreign policy in a bad light. In the 2008 book The Nuclear Express: A Political History of the Bomb and its Proliferation Thomas C. Reed and Danny B. Stillman stated their opinion that the "double flash" was the result of a joint South African-Israeli nuclear bomb test. David Albright stated in his article about the "double flash" event in the Bulletin of the Atomic Scientists that "If the 1979 flash was caused by a test, most experts agree it was probably an Israeli test".
In 2010, it was reported that, on 27 February 1980, President Jimmy Carter wrote in his diary, "We have a growing belief among our scientists that the Israelis did indeed conduct a nuclear test explosion in the ocean near the southern end of Africa."
Leonard Weiss, of the Center for International Security and Cooperation at Stanford University writes: "The weight of the evidence that the Vela event was an Israeli nuclear test assisted by South Africa appears overwhelming."
Reed has written that he believes the Vela incident was an Israeli neutron bomb test. The test would have gone undetected as the Israelis specifically chose a window of opportunity when, according to the published data, no active Vela satellites were observing the area. Although the decade-old Vela satellite that detected the blast was officially listed as "retired" by the U.S. government, it was still able to receive data. Additionally, the Israelis chose to set off the test during a typhoon. By 1984, according to Mordechai Vanunu, Israel was mass-producing neutron bombs.
The Republic of South Africa did have a nuclear weapons program at the time, and it falls within that geographic location. Nevertheless, it had acceded to the Partial Test Ban Treaty in 1963, and since the end of apartheid, South Africa has disclosed most of the information on its nuclear weapons programme. According to international inspections and the ensuing International Atomic Energy Agency report, South Africa could not have constructed such a nuclear bomb until November 1979, two months after the "double flash" incident. Furthermore, the IAEA reported that all possible South African nuclear bombs had been accounted for. A Central Intelligence Agency (CIA) report dated 21 January 1980, that was produced for the United States Arms Control and Disarmament Agency, concluded that:
In sum, State/INR finds the arguments that South Africa conducted a nuclear test on 22 September inconclusive, even though, if a nuclear explosion occurred on that date, South Africa is the most likely candidate for responsibility.
The United Nations Security Council Resolution 418 of 4 November 1977 introduced a mandatory arms embargo against South Africa, which also required all states to refrain from "any co-operation with South Africa in the manufacture and development of nuclear weapons".
Sasha Polakow-Suransky writes that, in 1979, South Africa was not yet advanced enough to test a nuclear device: "By the first week of October, the State Department had realized that South Africa was probably not the guilty party; Israel was a more likely candidate."
In 1979, the DIA reported that the test might have been a Soviet test done in violation of the 1963 Partial Nuclear Test Ban Treaty. Twenty years earlier in 1959, the USSR had conducted secret underwater tests in the Pacific in violation of the 1958 bilateral moratorium between the Soviet Union and the U.S. (cf. List of nuclear weapons tests of the Soviet Union) before the 1958 moratorium was unilaterally and officially abrogated by the Soviet Union in 1961.
India had carried out a nuclear test in 1974 (codenamed Smiling Buddha). The possibility that India would test a weapon was considered, since it would be possible for the Indian Navy to operate in those waters so far south; however, this was dismissed as impractical and unnecessary (given the fact that India had signed and ratified the Limited Test Ban Treaty or LTBT in 1963, and had complied with it even in its first test, and that India was not hiding its nuclear weapons capability).
An interagency intelligence memorandum requested by the United States National Security Council and entitled "The 22 September 1979 Event" analyzed the possibility of Pakistan wanting to prove its nuclear explosive technology in secret.
Since the "double flash", if one existed, could have occurred not very far to the west of the French-owned Kerguelen Islands, it is possible that the French were testing a small neutron bomb or other small tactical nuclear bomb.
Since 1980, some small amounts of new information have emerged. However, most questions remain unanswered:
TIROS-N plasma data and related geophysical data measured on 22 September 1979 were analyzed to determine whether the electron precipitation event detected by TIROS-N at 00:54:49 universal time could have been related to a surface nuclear burst (SNB). The occurrence of such a burst was inferred from light signals detected by two Vela bhangmeters −2 min before the TIROS-N event. We found the precipitation to be unusually large but not unique. It probably resulted from passage of TIROS-N through the precipitating electrons above a pre-existing auroral arc that may have brightened to an unusually high intensity from natural causes −3 min before the Vela signals....We conclude that such an event, although rare, is not unique and, furthermore, that this particular event was associated with an auroral arc that probably existed before the Vela event. Although it may be argued that the segment of the arc sampled by the TIROS-N was intensified by a SNB, we find no evidence to support this thesis or to suggest that the observation was anything but the result of natural magnetospheric processes.
There is still considerable disagreement within the Intelligence Community as to whether the flash in the South Atlantic detected by a US [...] satellite in September 1979 was a nuclear test, and if so, by South Africa. If the latter, the need for South Africa to test a device during the time frame of this Estimate is significantly diminished.[page needed]
Although I was not directly involved in planning or carrying out the operation, I learned unofficially that the flash was produced by an Israeli-South African test, code-named Operation Phoenix. The explosion was clean and was not supposed to be detected. But they were not as smart as they thought, and the weather changed—so the Americans were able to pick it up.
Gerhardt further stated that no South African naval vessels had been involved, and that he had no first-hand knowledge of a nuclear test. In 1993, then President F.W. de Klerk admitted that South Africa had indeed possessed six assembled nuclear weapons, with a seventh in production, but that they had been dismantled (before the first all-race elections of April 1994). There was no mention specifically of the Vela incident or of Israeli cooperation in South Africa's nuclear program.
The U.S. government should declassify additional information about the event. A thorough public airing of the existing information could resolve the controversy.
There remains uncertainty about whether the South Atlantic flash in September 1979 recorded by optical sensors on the U.S. Vela satellite was a nuclear detonation and, if so, to whom it belonged.[page needed]
We had operational successes, most importantly regarding Pretoria's nuclear capability. My sources collectively provided incontrovertible evidence that the apartheid government had in fact tested a nuclear bomb in the South Atlantic in 1979, and that they had developed a delivery system with assistance from the Israelis.
We have subjected this data to an intensive technical review and this review supports the conclusion that a nuclear explosion probably did occur.— 
A Central Intelligence Agency-sponsored panel of well-respected scientists concluded that a mysterious flash detected by a U.S. Vela satellite over the South Atlantic on the night of 22 September 1979 was likely a nuclear test.
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