Operation Argus

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Operation Argus was a series of nuclear weapons tests and missile tests secretly conducted during August and September of 1958 over the South Atlantic Ocean by the United States's Defense Nuclear Agency, in conjunction with the Explorer 4 space mission. Operation Argus was conducted between the nuclear test series Operation Hardtack I and Operation Hardtack II. Contractors from Lockheed Aircraft Corporation as well as a few personnel and contractors from the U.S. Atomic Energy Commission were on hand as well. The time frame for Argus was substantially expedited due to the instability of the political environment, i.e. forthcoming bans on atmospheric and exoatmospheric testing. Consequently, the tests were conducted within a mere half year of conception (whereas "normal" testing took one to two years).[1]


Original mission objectives

  • Two missiles, with warheads 136–227 kg to be launched within one month of each other, originating from a single site.
  • The missiles were to be detonated at altitudes of 200–1,000 mi, and also at 2,000–4,000 miles. Both detonations should occur near the geomagnetic equator.
  • Satellites were to be placed in equatorial (up to 30°) and polar (up to 70°) orbits, with perigees of roughly 322 km and apogees of roughly 2,900 km or greater. These satellites were to be used to measure electron density over time, and include a magnetometer, as well as a means for measuring ambient radio noise. Measurements were to be taken before the shots to determine a baseline, as well as during and after the events.
  • Sounding rockets, fired from appropriate ground locations, were to carry the same instrumentation as the satellites, except for radio noise. Ground stations to be used to study effects on radio astronomy and radar probing as well as aurora1 measurements.

Originally Argus was designated Hardtack-Argus, and later FLORAL. For reasons of security, both names were dropped in favor of the independent name Argus.

Funding was provided by the Armed Forces Special Weapons Project (AFSWP), the predecessor of today's Defense Threat Reduction Agency (DTRA). Total funds allotted for the project were US$ 9,023,000.

Task Force 88

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