Universität zu Köln

von Papen, Michael ORCID: 0000-0001-5030-1643 and Saur, Joachim ORCID: 0000-0003-1413-1231 (2016). Longitudinal and local time asymmetries of magnetospheric turbulence in Saturn's plasma sheet. J. Geophys. Res-Space Phys., 121 (5). S. 4119 - 4135. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-9402

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Abstract

Based on earlier studies that have shown Saturn's middle magnetosphere to contain turbulent magnetic field fluctuations, we analyze the spatial and temporal variations of the magnetic fluctuations and turbulent heating rate as a function of local time and magnetic phase. The region of study is Saturn's plasma sheet at a distance of 6-20R(s), where R-s is Saturn's equatorial radius. The data set consists of magnetic field data measured during 92 orbits (revolutions) from the equatorial phases of Cassini covering 9years from 2004 to 2012. We find asymmetries in the magnetosphere with enhanced fluctuations around noon. With respect to longitude we find increased fluctuations at 65 degrees southern and 250 degrees northern magnetic phase. This leads to an increased turbulent heating rate in these regions and is consistent with regions of increased plasma density and maximum downward field-aligned currents according to the quasi-dipolar perturbation fields. Analysis of single orbits reveals that the heating rate of 79% of all analyzed inbound and outbound legs is significantly (statistical error less than 1%) sinusoidally modulated. The modulation of the turbulent heating rate is predominantly observed during times when Cassini is located between dusk and midnight and additionally at dawn.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code von Papen, Michael UNSPECIFIED orcid.org/0000-0001-5030-1643 UNSPECIFIED Saur, Joachim UNSPECIFIED orcid.org/0000-0003-1413-1231 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-276281
DOI:	10.1002/2016JA022427
Journal or Publication Title:	J. Geophys. Res-Space Phys.
Volume:	121
Number:	5
Page Range:	S. 4119 - 4135
Date:	2016
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-9402
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ROTATION PERIOD; MAGNETIC-FIELD; ELECTRON-BEAMS; CURRENT REGION; IONOSPHERE; PERTURBATIONS; OSCILLATIONS; EMISSION; CURRENTS; AURORAE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/27628