MEX: MARSIS ELECTRON PLASMA DENSITY AND MAGNETIC FIELD DATA

This data set tabulates local electron densities and local magnetic field strengths magnetic field strengths obtained from Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) Active Ionospheric Sounding (AIS) mode ionograms. The electron density is obtained by measuring the increment in frequency between the plasma frequency harmonics, visible as bright vertical lines at low frequency and delay time in many MARSIS ionograms. Similarly, the local magnetic field strength is found by measuring the difference in delay time between electron cyclotron echoes, visible as bright horizontal lines at low frequency on many ionograms. Both the measured quantity and the derived result are included in the archive product. We also include a data quality flag giving the impression of the archivist as to how reliable each result is. This archive product includes only data from the nominal mission, which starts about orbit 1850 and ends on orbit 2539.本数据集整理了源自火星地下与电离层探测先进雷达（Mars Advanced Radar for Subsurface and Ionosphere Sounding, MARSIS）主动电离层探测（Active Ionospheric Sounding, AIS）模式下电离层图的局域电子密度与局域磁场强度。电子密度通过测量等离子体频率谐波之间的频率增量得到，这类谐波在多数MARSIS电离层图中表现为低频段的明亮垂直线，对应特定延迟时间。同理，局域磁场强度通过测量电子回旋回波之间的延迟时间差得到，这类回波在多数电离层图中表现为低频段的明亮水平线。存档产品中同时包含实测物理量与衍生计算结果。本数据集还附带数据质量标记，用于体现存档人员对各结果可靠性的评估。本存档产品仅包含标称任务阶段的数据，该任务始于约第1850轨，终止于第2539轨。