Periodic motion of the magnetodisk as a cause of quasi-periodic variations in the Kronian magnetosphere

Z. Nemeth, K. Szegö, L. Foldy, S. W H Cowley, G. Provan, M. Thomsen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Most of the phenomena that describe the magnetized plasma filling the huge magnetosphere of Saturn exhibit periodic behavior. The fundamental period reflected in many magnetospheric phenomena is the rotational period of the planet, but the relationship is not at all trivial. In most cases clear periodic behavior can be found only for relatively short time intervals, and often even in these intervals abrupt phase-shifts occur and non-rotational frequencies appear. Several sophisticated methods have been developed to filter out interfering fluctuations and find the basic periodicity and phase of the variations. Although these methods proved to be very useful, some information is inevitably lost in the process. To recover this otherwise lost information we follow a different strategy to analyse the quasi-periodic variations of the plasma properties. We assume that the motion of the magnetodisk is periodic and that the observed quasi-periodic variations are due to the interplay of this periodic motion and the effects governing the spatial dependence of the plasma parameters (F), especially their dependence on the distance (d) from the central sheet of the magnetodisk. We found that relatively simple . F(d) functions are able to reproduce the observed complex temporal dependence of the plasma properties.

Original languageEnglish
JournalPlanetary and Space Science
DOIs
Publication statusAccepted/In press - May 26 2015

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magnetospheres
magnetosphere
periodic variations
plasma
causes
intervals
Saturn
periodicity
planets
phase shift
planet
filter
filters
method

Keywords

  • Magnetodisk
  • Magnetosphere
  • Periodic variations
  • Saturn

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Periodic motion of the magnetodisk as a cause of quasi-periodic variations in the Kronian magnetosphere. / Nemeth, Z.; Szegö, K.; Foldy, L.; Cowley, S. W H; Provan, G.; Thomsen, M.

In: Planetary and Space Science, 26.05.2015.

Research output: Contribution to journalArticle

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AU - Szegö, K.

AU - Foldy, L.

AU - Cowley, S. W H

AU - Provan, G.

AU - Thomsen, M.

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