# Initial in-flight performance results from Solar Orbiter RPW/BIAS

Yuri V. Khotyaintsev, Andris Vaivads, Daniel B. Graham, Niklas J. T. Edberg, Erik P. G. Johansson, Milan Maksimovic, Stuart D. Bale, Thomas Chust, Matthieu Kretzschmar, Jan Soucek

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Yuri V. Khotyaintsev, Andris Vaivads, Daniel B. Graham, Niklas J. T. Edberg, Erik P. G. Johansson, et al.. Initial in-flight performance results from Solar Orbiter RPW/BIAS. 22nd EGU General Assembly, 2020, Online, France. 10.5194/egusphere-egu2020-14874 . insu-03560749

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Submitted on 8 Feb 2022

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# Initial in-flight performance results from Solar Orbiter RPW/BIAS

Yuri V. Khotyaintsev<fnref n="1" />, Andris Vaivads<fnref n="2" />, Daniel B. Graham<fnref n="1" />, Niklas J. T. Edberg<fnref n="1" />, Erik P. G. Johansson<fnref n="1" />, Milan Maksimovic<fnref n="3" />, Stuart D. Bale<fnref n="4" />, Thomas Chust<fnref n="5" />, Matthieu Kretzschmar<fnref n="6" />, and Jan Soucek<fnref n="7" />

The BIAS subsystem is a part of the Radio and Plasma Waves (RPW) instrument on the ESA Solar Orbiter mission. It allows sending bias current to each of the three RPW antennas. By setting the appropriate bias current the antenna potential can be shifted closer to the local plasma potential. This allows us to measure the floating potential of the spacecraft, as well as the electric field in the DC/LF frequency range with higher accuracy and lower noise level. Here we present the very initial results on RPW/BIAS in-flight performance based on the operations during the instrument commissioning.

<footnote n="1">¹Swedish Institute of Space Physics, Uppsala, Uppsala, Sweden (yuri@irfu.se)</footnote>

<footnote n="2">²Department of Space and Plasma Physics, School of Electrical Engineering and Computer Science, Royal Institute of Technology, Stockholm, Sweden</footnote>

<footnote n="3">³LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, Meudon, France</footnote>

<footnote n="4">⁴Space Sciences Laboratory, University of California, Berkeley, CA, USA</footnote>

<footnote n="5">⁵LPP, CNRS, Ecole Polytechnique, Sorbonne Université, Observatoire de Paris, Université Paris-Saclay, PSL Research University, Palaiseau, Paris, France</footnote>

<footnote n="6">⁶LPC2E, CNRS, Université d'Orléans, Orléans, France</footnote>

<footnote n="7">⁷Institute of Atmospheric Physics, Czech Academy of Sciences, Prague, Czech Republic</footnote>