Martian Atmospheric Evolution: Implications of an Ancient Intrinsic Magnetic Field
Martian Atmospheric Evolution: Implications of an Ancient Intrinsic Magnetic Field
复制标题
火星大气演化：古代固有磁场的影响
DOI：
10.1007/978-3-642-59381-9_14
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
G. Molina‐Cuberos
中科院分区：
文献类型：
--
作者：
H. Lammer;W. Stumptner;G. Molina‐Cuberos
在火星勘测者号（MGS）上的磁力计/电子反射计（MAG/ER）实验在其低气压破裂过程中探测到了高达1500 nT的表面磁异常，这是由残余地壳磁性造成的。这些磁异常强烈地表明存在着一个强大的古代火星固有磁矩，相当于现在地球磁场强度的10%-100%，这样一个古老的固有磁场对火星大气的演变产生了重大影响，特别是通过减少某些大气成分流失到太空。火星大气层的演变，就水而言，受到重大气成分的非热大气损失过程的影响。由于火星目前没有明显的内禀磁场和相对较小的重力加速度，所有已知的大气损失过程都起作用，几种重要的大气成分，即H，H2，N，O，C，CO，O2和CO2从大气中损失。随着时间的推移，大气成分的逃逸率，包括火星上H20的流失，表明在过去的35亿年里，这颗红色星球可能已经失去了至少1巴的大气层。
The Magnetometer/Electron Reflectometer (MAG/ER) experiment on board of Mars Qlobal Surveyor (MGS) has detected surface magnetic anomalies of up to 1500 nT during its low aerobreaking passes, resulting from remnant crustal magnetism. These magnetic anomalies strongly indicate the existence of a strong ancient intrinsic Martian magnetic moment, which corresponded to a magnetic field strength of 10%-100% of present Earth's.Such an ancient intrinsic magnetic field had significant consequences for the evolution of the Martian atmosphere, especially by reducing the amount of certain atmospheric constituents lost to space. The evolution of the Martian atmosphere, with regard to water, is influenced by non-thermal atmospheric loss processes of heavy atmospheric constituents. Since Mars does not have an appreciable intrinsic magnetic field at present and a comparatively small gravitational acceleration, all known atmospheric loss processes work and several important atmospheric constituents, namely H, H2, N, 0, C, CO, O2 and CO2 are lost from the atmosphere. The escape rates of atmospheric constituents over time, including the loss of H20 from Mars indicate that the red planet could have lost an atmosphere of at least 1 bar to space during the past 3.5 billion years.
影响因子：
2.8
作者：
MIURA, A;PRITCHETT, PL
通讯作者：
PRITCHETT, PL