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Volumn 281, Issue 5382, 1998, Pages 1480-1484

Lunar surface magnetic fields and their interaction with the solar wind: Results from lunar prospector

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; GEOLOGY; MAGNETIC FIELD; MOON; PRIORITY JOURNAL; REFLECTOMETRY; SOLAR RADIATION; SPACE FLIGHT;

EID: 0032483455     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.281.5382.1480     Document Type: Article
Times cited : (219)

References (44)
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    • note
    • The ER and experiment electronics are mounted on a 2.5-m boom that was deployed shortly after launch. The MAG sensor, which is separated from the ER electronics by a 1.2-m deployable boom, is a wide-range (up to 65,536 nT), low-noise (6 pT root mean square), high-sensitivity (as low as 2 pT) triaxial fluxgate magnetometer that measures magnetic fields from dc up to a sample rate of 18 Hz. The ER sensor consists of a symmetric hemispherical electrostatic analyzer that focuses incoming electrons onto an imaging detector that provides fine (∼1.4°) angular resolution in the plane of its 360° by 14° disk-shaped field of view (FOV). The analyzer is stepped in voltage through the entire energy range (∼10 to 20 keV) 32 times per spacecraft spin, and the ER is oriented so that its FOV covers the full sky (4π sr) every half spin (∼2.5 s). Thus, the full three-dimensional distribution of electrons can be obtained every half spin, but because of telemetry rate limitations it is only transmitted once every 16 spins (80 s, corresponding to ∼120 km of spacecraft motion). High temporal or spatial resolution mapping (2.5 s or ∼4 km) is provided in two energy channels by computing pitch angle bins with the magnetic field direction measured by the MAG, sorting the electron counts into the bins on board the spacecraft, and sending only the one-dimensional pitch angle distribution to the ground.
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    • Apollo-like compressions would peak near 78°S latitude in Fig. 1
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    • note
    • The contributions of P. Turin, R. Ulrich, R. Sterling, and J. Scheifele to the development of the experiment and data processing system are gratefully acknowledged. D.L.M. acknowledges discussions with S. D. Bale. WIND data were obtained from the Solar Wind Experiment (K. W. Olgilvie) and Magnetic Fields Investigation (R. P. Lepping) key parameter files. Research at the University of California, Berkeley, was supported by NASA through subcontract LMSC-HG80E477OR from Lockheed-Martin.


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