urn:nasa:pds:context:instrument:lp.er 1.0 1.11.0.0 Product_Context 2016-10-01 1.0 extracted metadata from PDS3 catalog and modified to comply with PDS4 Information Model urn:nasa:pds:context:instrument_host:spacecraft.lp instrument_to_instrument_host Acuna, M.H., J.E.P. Connerney, P. Wasilewski, R.P. Lin, K.A. Anderson, C.W. Carlson, J. McFadden, D.W. Curtis, H. Reme, A. Cros, J.L. Medale, J.A. Sauvaud, C. d'Uston, S.J. Bauer, P. Cloutier, M. Mayhew, and N.F. Ness, Mars Observer Magnetic Fields Investigation, J. Geophys. Res., 97, 7799-7814, 1992. reference.ACUNAETAL1992 Binder, A.B., W.C. Feldman, G.S. Hubbard, A.S. Konopliv, R.P. Lin, M.H. Acuna, and L.L. Hood, Lunar Prospector searches for polar ice, a metallic core, gas release events, and the moon's origin, Eos, Trans. AGU, 79, 97, 1998. reference.BINDERETAL1998 Carlson, C., D. Curtis, G. Paschmann, and W. Michael, An instrument for rapidly measuring plasma distribution functions with high resolution, Adv. Space Res., 2, 67, 1983. reference.CARLSONETAL1983 ELECTRON REFLECTOMETER Magnetometer not applicable not applicable Instrument Overview =================== The Lunar Prospector Electron Reflectometer (ER) 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. The ER instrumentation consists of a symmetric hemispherical electrostatic analyzer and an electronics box. The electronics box is common to the ER and its companion instrument, the Magnetometer (MAG). The ER has a 360 degree disk-shaped field-of-view. The electrostatic optics select energy and focus the particles onto an imaging detector. The ER sensor is a 12 cm diameter cylinder, 9 cm high. 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 Magnetometer/Electron Reflectometer (MAG/ER) experiment will investigate the origin and nature of lunar crustal magnetic fields and constrain the size of a metallic core. The experiment also will provide global maps of the lunar crustal magnetic fields and provide estimates of the lunar induced magnetic dipole moment [BINDERETAL1998]. Operational Considerations ========================== The ER unit maintains its temperature using thermal blanketing, surface finishes, and its internal power dissipation. The magnetic fields measured by the ER 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 ER and electronics box are mounted at the ends of a small cross bar on the MAG/ER boom, about 1 m inboard from the MAG. (The MAG is on the end of the same boom, about 2.6 m away from the spacecraft bus.) The ER unit is mounted so that its field-of-view includes the spin axis and is perpendicular to the boom. The only blockage of the ER field-of-view is the boom itself. The ER can measure magnetic fields as weak as one-millionth of the strength of the Earth's magnetic field. 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.