LP Electron Reflectometer Instrument

ODE:Moon

Mission:Lunar Prospector (LP)

Search Lunar Prospector Electron Reflectometer data in Lunar ODE: Product Search

The Lunar Prospector's (LP) Electron Reflectometer (ER) instrument was based on the instrument flown on the Mars Global Surveyor spacecraft (Acuna et al., 1992). Some changes were made to the Lunar Prospector version to account for the spinning spacecraft. The ER instrumentation consisted of a symmetric hemispherical electrostatic analyzer and an electronics box. The electronics box was common to the ER and its companion instrument, the Magnetometer (MAG). The ER had a 360 degree disk-shaped field-of-view. The electrostatic optics selected energy and focused the particles onto an imaging detector. The ER sensor was a 12 cm diameter cylinder and was 9 cm high.

The MAG/ER experiment investigated the origin and nature of lunar crustal magnetic fields and constrained the size of a metallic core. The experiment provided global maps of the lunar crustal magnetic fields and provided estimates of the lunar induced magnetic dipole moment (Binder et al., 1998). More information about the ER can be found in:

• Acuna, M.H. J. Connerney, P. Wasilewski, R. Lin, K. Anderson, C. Carlson, J. McFadden, D. Curtis, R. Reme, A. Cros, J. Medale, J. Sauvaud, C. D'Uston, S. Bauer, P. Cloutier, M. Mayhew, and N. Ness (1992), Mars Observer magnetic fields investigation, J. Geophys. Res., Vol. 97, pp. 7799 - 7814.

• Binder, A.B., W.C. Feldman, G.S. Hubbard, A.S. Konopliv, R.P. Lin, M.H. Acuna, and L.L. Hood (1998), Lunar Prospector searches for polar ice, a metallic core, gas release events, and the moon's origin, Eos, Trans. AGU, 79, 97.

• LP Science Interface Specification

• LP Level 0 Volume Software Interface Specification

• LP ER 3-D Electron Flux Data Description

• LP ER High Resolution Electron Flux Data Description

• LP ER Low Resolution Electron Flux Data Description

• LP ER Electron Reflection Document Description

 

ER Products

Processing Level	Product Type	Description	PDS3 Data Set / PDS4 Collection
Raw Data	MDR	NASA Level 0 (Raw/Unprocessed MDR) Data	LP-L-ENG/GRS/NS/APS/MAG/ER-1-MDR-V1.0
Calibrated Data	ER_3D	LP ER 3-D Electron Flux Data Collection - time ordered 3-D spectrum data from the LP ER (3D files) in units of particles/cm**2/sec/steradian/eV, for dates 1998-01-16 to 1999-07-29.	urn:nasa:pds:lp-er-calibrated:data-3deleflux
	ER_HI	LP ER High Resolution Electron Flux Data Collection - time ordered high resolution data from the LP ER (EH files), accumulated over 1/2 spacecraft spin, in units of particles/cm**2/sec/steradian/eV, for dates 1998-01-16 to 1999-07-29.	urn:nasa:pds:lp-er-calibrated:data-highresflux
	ER_LO	LP ER Low Resolution Electron Flux Data Collection - the LP omni-directional low resolution electron flux data provided as ASCII tables of 1 day duration. Fluxes are provided for 15 energy bins (~40ev - 20keV) collected over 16 spacecraft rotations (~80 sec). The ER section of the instrument samples 4 pi steradians twice each spin period.	urn:nasa:pds:lp-er-calibrated:data-lowresflux
Derived Data	DATAL2	LP ER Electron Reflection Data Collection - LP time ordered values of derived quantities from electron reflection, including calculated effective electron reflection coefficient from dates 1998-06-08 to 1999-06-27.	urn:nasa:pds:lp-er-derived:data-electron