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INSTITUTET FÖR RYMDFYSIK UPPSALA Swedish Institute of Space Physics (59°50.272′N, 17°38.786′E) Project work (30 c)/Examensarbete (30 hp) Investigation of antenna noise sources for the Solar Orbiter mission Student: Wictor Pansar, Luleå University of Technology Supervisor: Andris Vaivads Period: January - August 2013 Goal To characterize the noise levels for different expected plasma conditions of the electric field antennas on the future ESA mission Solar Orbiter. Abstract This master thesis report describes the expected noise that the electric antennas of the Solar Orbiter satellite will observe in the solar wind. The previous models only describe the high frequency range and accounts only for the quasi thermal noise (QTN) and shot noise. We present a new model that extends to low frequencies and which accounts also for the antenna resistive coupling to plasma, thermal noise and the preamplifier noise. The results of the model show that in the low frequency range a biased antenna has lower noise than unbiased antenna and is therefore to be recommend. In the high frequency range the diㄦence is not that big between a biased and unbiased antennas. For the measurement of QTN in the high frequency range it is recommend to use an unbiased antenna. A biased antenna has a noise magnitude that is 100 times smaller then an unbiased antenna in the low frequency range and close to Sun. A biased antenna is also resistively coupled to the plasma up to higher frequency Results Final report Git repository

https://www.space.irfu.se/exjobb/2013_wictor_pansar/index.html
last modified on Tuesday, 08-Oct-2013 18:27:53 CEST