火星全球勘测者号MAG/ER实验发现的地壳磁化全球分布。
Global distribution of crustal magnetization discovered by the mars global surveyor MAG/ER experiment.
作者信息
Acuna MH, Connerney JE, Ness NF, Lin RP, Mitchell D, Carlson CW, McFadden J, Anderson KA, Reme H, Mazelle C, Vignes D, Wasilewski P, Cloutier P
机构信息
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. Bartol Research Institute, University of Delaware, Newark, DE 19716, USA. Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA. Centre d'Etude Spatiale des Rayonn.
出版信息
Science. 1999 Apr 30;284(5415):790-3. doi: 10.1126/science.284.5415.790.
Vector magnetic field observations of the martian crust were acquired by the Mars Global Surveyor (MGS) magnetic field experiment/electron reflectometer (MAG/ER) during the aerobraking and science phasing orbits, at altitudes between approximately 100 and 200 kilometers. Magnetic field sources of multiple scales, strength, and geometry were observed. There is a correlation between the location of the sources and the ancient cratered terrain of the martian highlands. The absence of crustal magnetism near large impact basins such as Hellas and Argyre implies cessation of internal dynamo action during the early Naochian epoch ( approximately 4 billion years ago). Sources with equivalent magnetic moments as large as 1.3 x 10(17) ampere-meter2 in the Terra Sirenum region contribute to the development of an asymmetrical, time-variable obstacle to solar wind flow around Mars.
火星全球勘测者（MGS）的磁场实验/电子反射计（MAG/ER）在气动制动和科学调相轨道期间，于海拔约100至200公里处获取了火星地壳的矢量磁场观测数据。观测到了多种尺度、强度和几何形状的磁场源。这些源的位置与火星高地古老的陨石坑地形之间存在相关性。在诸如希腊盆地和阿吉尔盆地等大型撞击盆地附近不存在地壳磁性，这意味着在早诺亚纪时期（约40亿年前）内部发电机活动停止。在塞壬之地地区，具有高达1.3×10¹⁷安培·米²等效磁矩的源，促成了围绕火星的太阳风流动的不对称、随时间变化的障碍物的形成。
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