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- W2034177750 abstract "The radio astronomical experiment in Ariel II illustrates well the type of experimental work that can be carried out from satellites with radio receivers at frequencies near 1 MHz. Perhaps the most important result has been the measurement of the extragalactic component of the background radiation, not only because of the radiation processes themselves but because of the absorption in the galaxy which is showing up at frequencies below about 3 MHz. It has been our hope that ionospheric focusing would show some angular detail of this absorption, but as you will hear from Mr P. C. Gregory our present experiment is not good enough for this. It is still of great interest, however, to measure the background radiation over the range 2 to 4 MHz as accurately as possible, to show the onset of this absorption, and we may be able to do this quite well in Ariel III. The radio noise generated in the ionosphere, which was investigated very successfully by Ariel II, has so far only been detected with electric dipoles. It is possible that in Ariel III we shall provide a value for the H field in the noise bands, although so far it is only evident that the H field is small, as expected. These experimental results have been seriously upset by an unexpected difficulty in our experiment on Ariel III. It seems that there is an interaction between our experiment and the Birmingham experiments on electron density and temperature. This occurs solely in the ionosphere, and is not in any way a malfunction of the spacecraft. The account of our work which you will now hear from Mr P. C. Gregory is dominated by this effect, since it has been vital to understand it before we could safely use any part of our recordings. We are now able to say that about 10 % of our data is useful for the experiments I have mentioned, and we are at least able to promise some useful results." @default.
- W2034177750 created "2016-06-24" @default.
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- W2034177750 date "1969-08-12" @default.
- W2034177750 modified "2023-09-27" @default.
- W2034177750 title "The Ariel III cosmic radio noise experiment" @default.
- W2034177750 doi "https://doi.org/10.1098/rspa.1969.0132" @default.
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