Abstract
The feasibility of electric field measurements by the double sphere technique both inside and outside the magnetosphere is critically reviewed. In particular, influences resulting from photo-emission, secondary electron emission and the plasma environment are analyzed. It is concluded that a double sphere aerial, 50–100 m long, can measure dc electric fields as low as 0.1 mV m−1, in the solar wind and during conditions with ambient electron current density below 10−6 A m−2 in the magnetosphere, provided certain precautions are taken regarding probe symmetry. In the magnetosphere, for current densities larger than 10−6 A m−2, the space charge of photoelectrons escaping from the satellite will give rise to potential asymmetries near the probes, and an electron gun is required for control of the satellite potential and reduction of space charge asymmetries.
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© 1973 D. Reidel Publishing Company, Dordrecht, Holland
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Grard, R.J.L., Knott, K., Pedersen, A. (1973). The Influence of Photoelectron and Secondary Electron Emission on Electric Field Measurements in the Magnetosphere and Solar Wind. In: Grard, R.J.L. (eds) Photon and Particle Interactions with Surfaces in Space. Astrophysics and Space Science Library, vol 37. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2647-5_11
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DOI: https://doi.org/10.1007/978-94-010-2647-5_11
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