“Hook” structure in MARSIS ionogram and its interpretation

“Hook” structure in MARSIS ionogram and its interpretation
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MARSIS 电离图中的“Hook”结构及其解释

DOI:
10.1029/2009gl038844
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发表时间:
2009-07
影响因子:
5.2
通讯作者:
--
中科院分区:
地球科学1区
文献类型:
--
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MARSIS/MEX是一种低频雷达,用于探测火星电离层。一般来说,与天底反射有关的回波迹线表明,电离层的主要最大电子密度通常在约130公里的高度,密度随高度的增加而单调下降。另一个最大值有时在更高的高度被检测到,表明在上层电离层中存在双层。有时在轨迹的低频端观察到一种特殊的结构(这里称为“钩”):随着探测频率的降低,探测信号的延迟时间迅速增加。这里提出,该特征指示密度如此之低以致于雷达只能部分地分辨的次极大值。然后提出了一种处理“钩子”情况的解析反演方法。它进一步表明,“钩”是由垂直的波浪状结构在火星顶侧电离层。
MARSIS/MEX is a low frequency radar used to sound the ionosphere of Mars. In general the echo trace associated with reflections in nadir indicates an ionosphere with a main maximum electron density at typically about 130 km altitude, and a monotonously decreasing density with increasing altitude. Another maximum is sometimes detected at higher altitudes, indicating a double layer in the upper ionosphere. Sometimes a special structure (here called a “hook”) is observed at the low frequency end of the trace: as the sounding frequency decreases the delay time of sounding signal increases rapidly. It is here proposed that this signature indicates a secondary maximum with density which is so low that it can be only partly resolved by the radar. An analytical inversion approach coping with the “hook” case is then proposed. It is further suggested that the “hook” is caused by vertical wavelike structures in the Martian topside ionosphere.
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