Ultra-low-frequency radio astronomy observations from a Seleno-centric orbit
First results of the Longjiang-2 experiment
Jingye Yan (Chinese Academy of Sciences, National Space Science Center)
Ji Wu (National Space Science Center, Chinese Academy of Sciences)
Leonid I. Gurvits (Joint Institute for VLBI ERIC, Astrodynamics & Space Missions)
Lin Wu (Chinese Academy of Sciences, State Key Laboratory of Space Weather, National Space Science Center)
Li Deng (National Space Science Center)
Fei Zhao (National Space Science Center)
Li Zhou (National Space Science Center)
Ailan Lan (Chinese Academy of Sciences, National Space Science Center)
Wenjie Fan (National Space Science Center)
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Abstract
This paper introduces the first results of observations with the Ultra-Long-Wavelength (ULW) —- Low Frequency Interferometer and Spectrometer (LFIS) on board the selenocentric satellite Longjiang-2. We present a brief description of the satellite and focus on the LFIS payload. The in-orbit commissioning confirmed a reliable operational status of the instrumentation. We also present results of a transition observation, which offers unique measurements on several novel aspects. We estimate the RFI suppression required for such a radio astronomy instrumentation at the Moon-distances from Earth as order of − 80 dB. We analyse a method of separating Earth- and satellite-originated radio frequency interference (RFI). It is found that the RFI level at frequencies lower than a few MHz is smaller than the receiver noise floor.