Number of the records: 1
Spatial distribution of Langmuir waves observed upstream of Saturn's bow shock by Cassini
- 1.
SYSNO ASEP 0464282 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spatial distribution of Langmuir waves observed upstream of Saturn's bow shock by Cassini Author(s) Píša, David (UFA-U) RID, ORCID
Santolík, Ondřej (UFA-U) RID, ORCID
Hospodarsky, G. B. (US)
Kurth, W. S. (US)
Gurnett, D. A. (US)
Souček, Jan (UFA-U) RID, ORCIDSource Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 121, č. 8 (2016), s. 7771-7784Number of pages 14 s. Publication form Print - P Language eng - English Country US - United States Keywords Langmuir waves ; Cassini ; foreshock ; Saturn Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects GJ16-16050Y GA ČR - Czech Science Foundation (CSF) GAP209/12/2394 GA ČR - Czech Science Foundation (CSF) Institutional support UFA-U - RVO:68378289 UT WOS 000385811500032 EID SCOPUS 84983453525 DOI 10.1002/2016JA022912 Annotation We present the spatial distribution and spectral properties of Langmuir waves observed upstream of Saturn's bow shock by the Cassini spacecraft. The entire 10 kHz wideband data set obtained between June 2004 and December 2014 has been analyzed using an automated procedure. Almost 106 waveform snapshots with intense narrowband emissions in the frequency range of 1–10 kHz were detected. A typical wave spectrum exhibits a single intense peak (62% of all selected waveforms). However, spectra with a superposition of two (25%) or more (13%) intense peaks are also observed. Using magnetic field observations and a model of the bow shock, plasma wave activity across Saturn's foreshock has been mapped. The plasma wave occurrence increases steeply behind the tangent magnetic field line, i.e., the sunward foreshock boundary, and rises with increasing distance from the tangential line into the downstream region. The single peak spectra are observed across the entire foreshock, while more complicated spectra are more likely measured deeper inside the foreshock and closer to the bow shock. We confirm that the most intense waves occur close to the tangent point and decrease both deeper in the foreshock and along the tangential line. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2017
Number of the records: 1