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Magnetic Field Effect on Antenna Signals Induced by Dust Particle Impacts.

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Title: Magnetic Field Effect on Antenna Signals Induced by Dust Particle Impacts.
Authors: Nouzák, L.1 nouzak@aurora.troja.mff.cuni.cz, Sternovsky, Z.2,3, Horányi, M.2,4, Hsu, S.2, Pavlů, J.1, Shen, M.‐H.2,3, Ye, S.‐Y.5,6
Source: Journal of Geophysical Research. Space Physics. Jan2020, Vol. 125 Issue 1, pN.PAG-N.PAG. 1p.
Subject Terms: *Dust, Magnetic field effects, Space vehicles, Magnetic flux density, Electromagnets
Abstract: The Radio and Plasma Wave Science instrument on Cassini has observed fewer than expected dust particle impacts during the mission's Grand Finale orbits. The relatively strong magnetic field in the close vicinity of the planet has been suggested to affect the intensity of the dust impact generated signals. A laboratory investigation is performed using dust particles accelerated to ≥20 km/s speed impacting onto a previously developed model of the spacecraft and the Radio and Plasma Wave Science antennas. The external magnetic field is generated by two sets of magnetic coils. The recorded antenna waveforms are decomposed into contributions from the electrons and ions of the dust impact generated plasma cloud. A good qualitative understanding of the waveforms is achieved by dividing the electron and ion population into two portions: one that is escaping from the spacecraft and another that is collected by the spacecraft. The experimental results show that the part of the signal corresponding to escaping electrons is affected by the magnetic field and that dust impact signals can be significantly reduced for spacecraft floating potentials close to zero. Key Points: Dust impact signals can be significantly reduced for spacecraft floating potentials close to zeroThe magnetic field affects only the electron part of impact signals according to the magnetic field strength, its orientationFor case of RPWS in D ring, experiment shows the low SC potential has a stronger effect on impact signals than the magnetic field of Saturn [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Magnetic Field Effect on Antenna Signals Induced by Dust Particle Impacts.
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  Data: <searchLink fieldCode="AR" term="%22Nouzák%2C+L%2E%22">Nouzák, L.</searchLink><relatesTo>1</relatesTo><i> nouzak@aurora.troja.mff.cuni.cz</i><br /><searchLink fieldCode="AR" term="%22Sternovsky%2C+Z%2E%22">Sternovsky, Z.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Horányi%2C+M%2E%22">Horányi, M.</searchLink><relatesTo>2,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Hsu%2C+S%2E%22">Hsu, S.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Pavlů%2C+J%2E%22">Pavlů, J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shen%2C+M%2E‐H%2E%22">Shen, M.‐H.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Ye%2C+S%2E‐Y%2E%22">Ye, S.‐Y.</searchLink><relatesTo>5,6</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Jan2020, Vol. 125 Issue 1, pN.PAG-N.PAG. 1p.
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  Data: *<searchLink fieldCode="DE" term="%22Dust%22">Dust</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+field+effects%22">Magnetic field effects</searchLink><br /><searchLink fieldCode="DE" term="%22Space+vehicles%22">Space vehicles</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+flux+density%22">Magnetic flux density</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnets%22">Electromagnets</searchLink>
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  Data: The Radio and Plasma Wave Science instrument on Cassini has observed fewer than expected dust particle impacts during the mission's Grand Finale orbits. The relatively strong magnetic field in the close vicinity of the planet has been suggested to affect the intensity of the dust impact generated signals. A laboratory investigation is performed using dust particles accelerated to ≥20 km/s speed impacting onto a previously developed model of the spacecraft and the Radio and Plasma Wave Science antennas. The external magnetic field is generated by two sets of magnetic coils. The recorded antenna waveforms are decomposed into contributions from the electrons and ions of the dust impact generated plasma cloud. A good qualitative understanding of the waveforms is achieved by dividing the electron and ion population into two portions: one that is escaping from the spacecraft and another that is collected by the spacecraft. The experimental results show that the part of the signal corresponding to escaping electrons is affected by the magnetic field and that dust impact signals can be significantly reduced for spacecraft floating potentials close to zero. Key Points: Dust impact signals can be significantly reduced for spacecraft floating potentials close to zeroThe magnetic field affects only the electron part of impact signals according to the magnetic field strength, its orientationFor case of RPWS in D ring, experiment shows the low SC potential has a stronger effect on impact signals than the magnetic field of Saturn [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Space Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1029/2019JA027245
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        Text: English
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      – SubjectFull: Dust
        Type: general
      – SubjectFull: Magnetic field effects
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      – SubjectFull: Space vehicles
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      – SubjectFull: Magnetic flux density
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      – TitleFull: Magnetic Field Effect on Antenna Signals Induced by Dust Particle Impacts.
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              Text: Jan2020
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