Journal article
Quasiperiodic Saturn Auroral Hiss Observed During a Cassini Proximal Orbit
Journal of geophysical research. Space physics, Vol.125(1), e2019JA027338
01/01/2020
DOI: 10.1029/2019JA027338
Abstract
Saturn auroral hiss is intense whistler mode emission similar in morphology to terrestrial auroral hiss, and is observed at high latitude very often in quasiperiodic episodes with a period of approximately 1 hr. Bader et al. (2019) report auroral pulsations that may be due to duskside magnetodisk reconnection. The source of the 1-hr period is not definitively known but has been purported to be due to second harmonic Alfven waves standing along near planet magnetic field lines (Yates et al., 2016). Observations of auroral hiss at high latitude along Cassini proximal orbits are often excellent, and we have focused on an event for which we have concurrent ultraviolet auroral images as well as electron flux data. A series of repeating auroral hiss episodes is observed to initiate near the magnetic field line that traverses a Saturn kilometric radiation source region in each hemisphere, with periodic episodes of hiss recurring at higher L-shells. Magnetic field lines centered on individual hiss episodes have auroral footprints that lie near and within a region of intense auroral ultraviolet emissions. These observations have a parallel in terrestrial return current electron beam-generated auroral hiss seen near magnetic field lines supporting auroral kilometric radiation source regions. Recent findings link periodic plasma injections with Saturn reconnection sites observed preferentially on the duskside. These injections may spawn Saturn kilometric radiation source regions and periodic auroral hiss emission in nearby return current regions.
Details
- Title: Subtitle
- Quasiperiodic Saturn Auroral Hiss Observed During a Cassini Proximal Orbit
- Creators
- J. D. Menietti - University of IowaB. Palmaerts - University of LiègeJ. Zahlava - Charles UniversityT. F. Averkamp - University of IowaJ. B. Groene - University of IowaW. S. Kurth - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.125(1), e2019JA027338
- Publisher
- Amer Geophysical Union
- DOI
- 10.1029/2019JA027338
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 10
- Grant note
- Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA NNX16AI47G / NASA; National Aeronautics & Space Administration (NASA) LTAUSA 17070 / MSMT; Ministry of Education, Youth & Sports - Czech Republic 1415150 / JPL
- Language
- English
- Date published
- 01/01/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455658802771
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