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Volumn 336, Issue 6078, 2012, Pages 217-220

Topography of the northern hemisphere of mercury from MESSENGER laser altimetry

(24)  Zuber, Maria T a   Smith, David E a   Phillips, Roger J b   Solomon, Sean C c   Neumann, Gregory A d   Hauck II, Steven A e   Peale, Stanton J f   Barnouin, Olivier S g   Head, James W h   Johnson, Catherine L i   Lemoine, Frank G d   Mazarico, Erwan a,d   Sun, Xiaoli d   Torrence, Mark H d,j   Freed, Andrew M k   Klimczak, Christian c   Margot, Jean Luc l   Oberst, Jürgen m   Perry, Mark E g   McNutt Jr , Ralph L g   more..


Author keywords

[No Author keywords available]

Indexed keywords

ALTIMETRY; EMPLACEMENT; HISTORY OF GEOLOGY; MERCURY (PLANET); NORTHERN HEMISPHERE; NUMERICAL MODEL; PLANETARY SURFACE; SPACECRAFT; TOPOGRAPHY; UPLIFT; VOLCANO;

EID: 84862776604     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1218805     Document Type: Article
Times cited : (158)

References (29)
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    • The MLA is a time-of-flight laser rangefinder that uses direct detection and pulse-edge timing to determine precisely the range from the MESSENGER spacecraft to Mercury's surface. MLA's laser transmitter emits 5-ns-wide pulses at an 8-Hz rate with 20 mJ of energy at a wavelength of 1064 nm. Return echoes are collected by an array of four refractive telescopes and are detected with a single silicon avalanche photodiode detector. The timing of laser pulses is measured with a set of time-to-digital converters and counters and a crystal oscillator operating at a frequency that is monitored periodically from Earth.
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    • note
    • Median differential slope (29) removes the effect of larger-scale tilts from the elevation difference at a given baseline length. At each location x, half the difference in elevations between points one baseline length ahead and one behind along the altimetry ground track is subtracted from the difference in elevation between points one-half baseline length ahead and one-half behind, as tan a = {h[x + (l/2)] - h[x - (l/2)] - 0.5[h(x + l) - h(x - l)]}/l, where h is elevation, l is the baseline length, and α is the differential slope.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.