艾伦望远镜阵列搜索火星上的静电放电
The Allen Telescope Array Search for Electrostatic Discharges on Mars
摘要：
2010年3月9日至6月2日期间，艾伦望远镜阵列被用于监测火星的无线电发射，时间总共约为30小时，以监测表明静电放电的无线电发射。Ruf等人（2009年）的报告指出，探测到来自火星的非热微波辐射，其特征是峰态功率谱峰值为10赫兹，与2006年6月8日的一次大沙尘暴事件相吻合。对于这些观测，我们在天文信号处理和电子研究中心（CASPER）开发了一个宽带信号处理器。这款1024通道光谱仪可计算累积功率和功率平方，并在观测后计算光谱峰度。峰度的变化指示信号中的非高斯性，其可用于检测可变宇宙信号以及射频干扰（RFI）。在三个月的观测期间，火星上出现了小规模沙尘暴形式的尘埃活动，但没有检测到闪电放电的信号。在3.2和8.0 GHz处都可以看到包含具有近似10 Hz基频的谱峰的kurtstrum中的频繁信号，但是这是具有在宽频率范围上扩展的谐波的窄带RFI的结果。
英文摘要：
The Allen Telescope Array was used to monitor Mars between 9 March and 2 June 2010, over a total of approximately 30 hours, for radio emission indicative of electrostatic discharge. The search was motivated by the report from Ruf et al. (2009) of the detection of non-thermal microwave radiation from Mars characterized by peaks in the power spectrum of the kurtosis, or kurtstrum, at 10 Hz, coinciding with a large dust storm event on 8 June 2006. For these observations, we developed a wideband signal processor at the Center for Astronomy Signal Processing and Electronics Research (CASPER). This 1024-channel spectrometer calculates the accumulated power and power-squared, from which the spectral kurtosis is calculated post-observation. Variations in the kurtosis are indicative of non-Gaussianity in the signal, which can be used to detect variable cosmic signals as well as radio frequency interference (RFI). During the three month period of observations, dust activity occurred on Mars in the form of small-scale dust storms, however no signals indicating lightning discharge were detected. Frequent signals in the kurtstrum that contain spectral peaks with an approximate 10 Hz fundamental were seen at both 3.2 and 8.0 GHz, but were the result of narrowband RFI with harmonics spread over a broad frequency range.
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