The low-frequency source of Saturn’s kilometric radiation

L. Lamy; P. Zarka; B. Cecconi; R. Prangé; W. Kurth; G. Hospodarsky; A. Persoon; M. Morooka; J.-E. Wahlund; G. Hunt

doi:10.1126/science.aat2027

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The low-frequency source of Saturn’s kilometric radiation

Journal article

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Peer reviewed

The low-frequency source of Saturn’s kilometric radiation

L. Lamy, P. Zarka, B. Cecconi, R. Prangé, W. Kurth, G. Hospodarsky, A. Persoon, M. Morooka, J.-E. Wahlund and G. Hunt

Science (American Association for the Advancement of Science), Vol.362(6410), p.2027

10/05/2018

DOI: 10.1126/science.aat2027

PMID: 30287632

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Abstract

Understanding how auroral radio emissions are produced by magnetized bodies requires in situ measurements within their source region. Saturn’s kilometric radiation (SKR) has been widely used as a remote proxy of Saturn’s magnetosphere. We present wave and plasma measurements from the Cassini spacecraft during its ring-grazing high-inclination orbits, which passed three times through the high-altitude SKR emission region. Northern dawn-side, narrow-banded radio sources were encountered at frequencies of 10 to 20 kilohertz, within regions of upward currents mapping to the ultraviolet auroral oval. The kilometric waves were produced on the extraordinary mode by the cyclotron maser instability from 6– to 12–kilo–electron volt electron beams and radiated quasi-perpendicularly to the auroral magnetic field lines. The SKR low-frequency sources appear to be strongly controlled by time-variable magnetospheric electron densities.

Astrophysics

Instrumentation and Methods for Astrophysic

Physics

Details

Title: Subtitle: The low-frequency source of Saturn’s kilometric radiation
Creators: L. Lamy - Sorbonne Paris Cité
P. Zarka - Sorbonne Paris Cité
B. Cecconi - Sorbonne Paris Cité
R. Prangé - Sorbonne Paris Cité
W. Kurth - University of Iowa
G. Hospodarsky - University of Iowa
A. Persoon - University of Iowa
M. Morooka - Swedish Institute of Space Physics
J.-E. Wahlund - Swedish Institute of Space Physics
G. Hunt - Imperial College London
Resource Type: Journal article
Publication Details: Science (American Association for the Advancement of Science), Vol.362(6410), p.2027
DOI: 10.1126/science.aat2027
PMID: 30287632
NLM abbreviation: Science
ISSN: 0036-8075
eISSN: 1095-9203
Publisher: American Association for the Advancement of Science (AAAS)
Grant note: DOI: 10.13039/100006196, name: Jet Propulsion Laboratory, award: 1415150; DOI: 10.13039/501100002830, name: Centre National d’Etudes Spatiales; DOI: 10.13039/501100004617, name: Institut National des Sciences de l'Univers, Centre National de la Recherche Scientifique
Language: English
Date published: 10/05/2018
Academic Unit: Physics and Astronomy
Record Identifier: 9984455278702771

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