urn:nasa:pds:context:instrument:lp.mag 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 MAGNETOMETER Magnetometer not applicable not applicable 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.