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arXiv 1209.3033astro-ph.IM
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月球着陆器的射电天文学:开放最后一个未探索的频率范围

Radio astronomy with the Lunar Lander: opening up the last unexplored frequency regime

Marc Klein Wolt, Amin Aminaei, Philippe Zarka, Jan-Rutger Schrader, Albert-Jan Boonstra, Heino Falcke

摘要:

现设想将有源宽带(1 kHz-100 MHz)三极天线安装在位于月球南极的欧洲月球着陆器上,以便对外逸层和电离层及其与地球磁层、太阳粒子、风和日冕物质抛射的相互作用进行敏感测量,并研究月球上的无线电通信,这对未来的月球人类和科学探索至关重要。此外,月球南极为射电天文学提供了极好的机会。将一个单一的无线电天线放置在一个永远黑暗的陨石坑或南(或北)极的山脉后面,可能会提供完美的屏蔽,免受人为无线电干扰(RFI),没有电离层扭曲,高温和天线增益稳定性,允许检测大爆炸后形成的原始氢的21厘米波发射,进入第一批恒星形成的时期。在这些频率下探测到来自月球的21厘米线,将首次提供关于早期宇宙中物质分布和演化的线索,这些物质分布和演化是在电离时代和再电离时代(EoR)之间。一个单一的月球无线电天线还将允许研究太阳耀斑和日冕物质抛射对地球附近太阳风的影响(空间天气),并将开启对来自木星和土星等行星的低频无线电事件的研究,已知这些行星会发出低于30兆赫的明亮(千焦-兆焦)无线电发射(Jester和Falcke,2009年)。最后,月球着陆器上的一个无线电天线将为未来的大型月球无线电干涉仪铺平道路;它不仅将展示月球无线电科学的可能性,开辟最后一个未探索的无线电领域,而且还将允许通过测量当地无线电背景噪声来确定月球无线电科学的局限性。

英文摘要:

The active broadband (1 kHz-100 MHz) tripole antenna now envisaged to be placed on the European Lunar Lander located at the Lunar South Pole allows for sensitive measurements of the exosphere and ionosphere, and their interaction with the Earths magnetosphere, solar particles, wind and CMEs and studies of radio communication on the moon, that are essential for future lunar human and science exploration. In addition, the lunar South pole provides an excellent opportunity for radio astronomy. Placing a single radio antenna in an eternally dark crater or behind a mountain at the south (or north) pole would potentially provide perfect shielding from man-made radio interference (RFI), absence of ionospheric distortions, and high temperature and antenna gain stability that allows detection of the 21 cm wave emission from pristine hydrogen formed after the big bang and into the period where the first stars formed. A detection of the 21 cm line from the moon at these frequencies would allow for the first time a clue on the distribution and evolution on mass in the early universe between the Epoch of Recombination and Epoch of Reionization (EoR). A single lunar radio antenna would also allow for studies of the effect of solar flares and Coronal Mass Ejections (CMEs) on the solar wind at distances close to earth (space weather) and would open up the study of low frequency radio events from planets such as Jupiter and Saturn, which are known to emit bright (kJy-MJy) radio emission below 30 MHz (Jester & Falcke, 2009). Finally, a single radio antenna on the lunar lander would pave the way for a future large lunar radio interferometer; not only will it demonstrate the possibilities for lunar radio science and open up the last unexplored radio regime, but it will also allow a determination of the limitations of lunar radio science by measuring the local radio background noise.

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