Operation CASTLE's 15 MT Bravo early fireball with Compton Effect lightning, March 1, 1954

Saturday, August 24, 2013

Operation DOMINIC Johnston Island (1962), Section 2

Telemetry antennas sent instructions and received data, respectively to and from high altitude rockets:

The high frequency antennas -- VHF to microwave bands -- shown above, were right-handed circular electric field polarity. Circular polarity produces a beam effect. Helical antennas are friendly to changing orientations of rocket- or satellite-borne antennas.

Right-handed circular polarization
Graphic from Wikipedia

The southern conjugate data capture site for high altitude nuclear tests was stationed on and around Tutuila, American Samoa.

Another view:

The southern geomagnetic conjugate region relative to the northern firing site, Johnston Island:

Scientific data stations dotted the Pacific hemisphere:

(United States Army Ship) USAS American Mariner tracked missiles and their warhead trajectories during the high altitude series.

Research vessels associated with military use have the international white exterior, to declare their noncombatant (unarmed) status. Hospital ships also fall into this maritime category. Many people today don't know that FDR enjoyed the use of US Coast Guard cutter converted into a private, white, 165 ft (50 m) long presidential yacht: USS Potomac.

The USAS American Mariner moved its tracking antennas in unison (below). This was filmed before application of its white international overcoat, after a refit of its advanced electronics, prior to its service with DOMINIC I. Rather surprisingly, this was an exceptionally difficult scene to correct.

Facing toward the bow, a 28 ft (8.5 m) UHF/L-band radar was at the top center, flanked by two C-band AN-FPQ-4 dishes. To the bottom right was a smaller radiosonde dish for high altitude balloon data acquisition. White crosses below the large dish along the center were part of a telemetry antenna. Two Mk-51 optical directors were on the deck, on both sides of the white-domed pedestal. The Mk-51s were protected by a large shield that minimized crew radiation radiation exposure from the powerful emitters on top.

The aspect ratio is different in this sample, because this was a new rendering for the widescreen format, minus the sidebars.

Compare to this clip posted at YouTube by another party:

A Sikorsky UH-34D Seahorse during a Thor pod recovery, marked by a bright green dye from a self-deploying cannister:

Instrument pods, like these carried on the Thor missiles, recorded data within and near the thermonuclear fireballs.

13 April, 2014 trial scene update of this camera array (above).

Weather balloons were critical for shot forecast conditions, to predict fallout distribution and manage safety concerns for populated islands.

The telemetry package took off:

Radars tracked these gauges while receiving data.

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