Interpreting Dust Impact Signals Detected by the STEREO Spacecraft.
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| Title: | Interpreting Dust Impact Signals Detected by the STEREO Spacecraft. |
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| Authors: | O'Shea, E.1,2, Sternovsky, Z.2,3,4 zoltan.sternovsky@colorado.edu, Malaspina, D. M.2 |
| Source: | Journal of Geophysical Research. Space Physics. Dec2017, Vol. 122 Issue 12, p11,864-11,873. 10p. |
| Abstract: | Abstract: There is no comprehensive understanding yet of how dust impacts on spacecraft (SC) generate signals detected by antenna instruments. The high sensitivity of the S/WAVES instrument and the large number and high diversity of dust impacts detected make the STEREO mission particularly well suited for a closer investigation. A floating perturbation model (FPP) was recently proposed to explain the characteristic shape of dust impact signals with an overshoot. The FPP model posits that the overshoot is due to the different discharge time constant of the SC and the individual antennas. Kinetic simulations are performed to demonstrate that, contrary to common belief, antennas are inefficient collectors of charged particles from impact plasmas. The collection efficiency is small, only 0.1–1%, varying weakly with the bias potential between the antenna and the SC, and more strongly with impact location. The low recollection efficiencies and an analysis of the shapes and scaling of typical and atypical signals recorded by S/WAVES suggest that, besides the mechanism described by the FPP model, there is another, possibly stronger mechanism that is responsible for generating the characteristic overshoot for most dust impact signals observed by STEREO. [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.) | |
| Database: | GreenFILE |
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| Header | DbId: 8gh DbLabel: GreenFILE An: 127847186 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Interpreting Dust Impact Signals Detected by the STEREO Spacecraft. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22O'Shea%2C+E%2E%22">O'Shea, E.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Sternovsky%2C+Z%2E%22">Sternovsky, Z.</searchLink><relatesTo>2,3,4</relatesTo><i> zoltan.sternovsky@colorado.edu</i><br /><searchLink fieldCode="AR" term="%22Malaspina%2C+D%2E+M%2E%22">Malaspina, D. M.</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Space+Physics%22">Journal of Geophysical Research. Space Physics</searchLink>. Dec2017, Vol. 122 Issue 12, p11,864-11,873. 10p. – Name: Abstract Label: Abstract Group: Ab Data: Abstract: There is no comprehensive understanding yet of how dust impacts on spacecraft (SC) generate signals detected by antenna instruments. The high sensitivity of the S/WAVES instrument and the large number and high diversity of dust impacts detected make the STEREO mission particularly well suited for a closer investigation. A floating perturbation model (FPP) was recently proposed to explain the characteristic shape of dust impact signals with an overshoot. The FPP model posits that the overshoot is due to the different discharge time constant of the SC and the individual antennas. Kinetic simulations are performed to demonstrate that, contrary to common belief, antennas are inefficient collectors of charged particles from impact plasmas. The collection efficiency is small, only 0.1–1%, varying weakly with the bias potential between the antenna and the SC, and more strongly with impact location. The low recollection efficiencies and an analysis of the shapes and scaling of typical and atypical signals recorded by S/WAVES suggest that, besides the mechanism described by the FPP model, there is another, possibly stronger mechanism that is responsible for generating the characteristic overshoot for most dust impact signals observed by STEREO. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: 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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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/2017JA024786 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 11,864 Titles: – TitleFull: Interpreting Dust Impact Signals Detected by the STEREO Spacecraft. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: O'Shea, E. – PersonEntity: Name: NameFull: Sternovsky, Z. – PersonEntity: Name: NameFull: Malaspina, D. M. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 21699380 Numbering: – Type: volume Value: 122 – Type: issue Value: 12 Titles: – TitleFull: Journal of Geophysical Research. Space Physics Type: main |
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