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Journal of Geophysical Research Atmospheres
Article . 2012 . Peer-reviewed
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Identification of electron field‐aligned current systems in Saturn's magnetosphere

Authors: Schippers, P.; Andre, N.; Gurnett, D.; Lewis, G.; Persoon, A.; Coates, A.;

Identification of electron field‐aligned current systems in Saturn's magnetosphere

Abstract

Based on the analysis of 7 years of Cassini electron plasma spectrometer data near Saturn's equatorial plane, we computed the average directional electron current in the Northern and the Southern hemispheres separately. We determined the net current density by subtracting the downward electron current density (equator to the ionosphere) from the upward electron current density (ionosphere to the equator). From the symmetric analysis (no separation in local time), we identified: (1) layers of net upward current carried by the thermal electrons (1–10 eV) in both hemispheres inside 5–8 RS (Saturn Radius = 60,268 km) (region A) and (2) layers of net downward current carried by a population of warmer electrons (10–400 eV) inside 8–10 RS (region B). From the analysis of the currents organized by local time (dayside and nightside parsing), new features were identified such as (1) a day‐night asymmetry of the current carried by the warm and hot (400 eV–26,000 eV) electrons beyond 10 RS (region C), and (2) the possible existence of inter‐hemispheric currents directed from the Southern to the Northern hemisphere inside 4 RS (region A) and oppositely directed at about 13–15 RS (region C). Our interpretation is that the observed current system results from the superimposition of (1) a current system associated with the corotation enforcement, (2) a current system linked to the presence of the newly identified noon‐to‐midnight convection electric field and (3) a system of inter‐hemispheric currents driven by the thermosphere‐ionosphere. We finally discuss the relation of the observed currents with the newly identified Saturn's secondary auroral emissions.

Country
France
Keywords

[PHYS]Physics [physics], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph], 550, [SDU.ASTR] Sciences of the Universe [physics]/Astrophysics [astro-ph], [PHYS] Physics [physics]

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
24
Average
Top 10%
Top 10%
Green
bronze