ELECTRICAL HAZARDS OF DOCKING IN SPACE.
Abstract
If two earth satellites are joined by a conductor more than a few meters long the E.M.F. generated by its cutting the earth's magnetic field can set up an electrical current. The return path of the current is through the magnetized plasma surrounding the earth (approx. 1 ohm) and the sheath surrounding the lower (negative) satellite. Calculations are presented of the length of conductor necessary to cause this current to exceed the 'limit of physical endurance' of an astronaut attempting to join the two satellites. Should an intermittent connection exist between an astronaut and a single satellite, sufficient alternating component current could flow through the collection area of his suit to exceed the 'let go' current of his muscles. Should a hot spot develop on an astronaut's suit or equipment (while he is below his satellite) so that thermionic emission shorts his sheath, the current can exceed one ampere. Partial calculations based on estimated mobilities of small solid particles in rocket exhaust suggest that the limiting potential of a vehicle in the shadow of the moon may approach a million vots. If docking occurred shortly after a power maneuver, as much as a kilojoule of energy could then be dissipated in the ensuing discharge and welding action. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1966
- Accession Number
- AD0635962
Entities
People
- Deborah J. Nelson
- J. E. Drummond
Organizations
- Boeing