Instrument Overview
  ===================
    The Lunar Prospector Magnetometer (MAG) instrument is based on the
    instrument flown on the Mars Global Surveyor spacecraft
    [ACUNAETAL1992].  Some changes were made to the Lunar Prospector
    version to account for the spinning spacecraft.  Also, there is only
    one magnetometer sensor on Lunar Prospector.  The MAG
    instrumentation consists of a 3-axis fluxgate magnetometer and an
    electronics box.  The electronics box is common to the MAG and its
    companion instrument, the Electron Reflectometer (ER).  The MAG
    sensor is a wide-range (up to +/- 65,536 nT), low-noise (6 pT RMS),
    high-sensitivity (as low as +/- 2 pT), triaxial fluxgate
    magnetometer.  The MAG sensor is an 11 x 6.5 x 9 cm box.
 
    The combined mass of the Magnetometer and Electron Reflectometer is
    about 5 kg, and the two instruments together use about 4.5 w of
    power.
 
 
  Scientific Objectives
  =====================
    The MAG/ER experiment will investigate the origin and nature of
    lunar crustal magnetic fields and constrain the size of a metallic
    core.  The experiment will also provide global maps of the lunar
    crustal magnetic fields and provide estimates of the lunar induced
    magnetic dipole moment [BINDERETAL1998].
 
 
  Operational Considerations
  ==========================
    The MAG sensor uses a combination of thermal blanketing and heaters
    to maintain its operating temperature.
 
    The magnetic fields measured by the MAG will be a combination of the
    Earth's magnetic field, the field carried from the Sun by the solar
    wind, and the Moon's field, which is extremely weak.  The magnetic
    field at the lunar surface also is affected by local deposits of
    magnetic material.
 
 
  Detector Mounting Descriptions
  ==============================
    The MAG sensor is mounted at the end of the MAG/ER boom about 2.6 m
    away from the spacecraft bus.  This sensor is situated about 1 m
    outboard of a small cross bar on which the ER and electronics box
    are mounted.
 
 
  Operational Modes
  =================
    The magnetometer data are sampled 16 times per second, synchronous
    with the telemetry clock.  Data are compressed by delta-modulation
    to 6 bits per axis per channel.  Occasional full samples (12 bits
    per axis plus range) are collected.
 
 
  Principal Investigator
  ======================
    The Co-I and magnetics group leader for the Lunar Prospector
    Magnetometer and Electron Reflector experiment is Dr. Robert Lin of
    the University of California, Berkeley.