Measurement of lunar and planetary magnetic fields by reflection of low energy electrons

Details Measurement of lunar and planetary magnetic fields by reflection of low energy electrons Measurement of lunar and planetary magnetic fields by reflection of low energy electrons

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ssi.....1..439a&link_type=abstract

Space Science Instrumentation, vol. 1, Nov. 1975, p. 439-470.

Other

8

Apollo Flights, Electron Energy, Lunar Magnetic Fields, Planetary Magnetic Fields, Apollo 15 Flight, Apollo 16 Flight, Electron Flux Density, Magnetic Field Configurations, Magnetometers, Particle Motion, Reflectance, Reflection, Trajectory Analysis

Scientific paper

The paper describes the technique of planetary electron reflection magnetometry (PERM), a method for measuring the magnitude, direction, and scale size of magnetic fields near the surface of the moon and other planetary bodies with weak and small-scale-size surface fields. It is noted that the PERM technique is based on the ability of magnetic fields to reflect charged particles. A qualitative account of the implementation of the technique is presented along with some results obtained by the Apollo 15 and 16 Particles and Fields subsatellites. The quantitative aspects of PERM are treated by examining solutions to the equation of motion of a charged particle in a magnetic field, computing reflection coefficients on the basis of trajectory calculations, and determining the direction of the lunar surface magnetic field. The sensitivity of the PERM technique is calculated, and effects of lunar electric fields and spacecraft potentials on the measurements are described. Extension of the technique to Mars and Venus is discussed.

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