Journal article
An update to a Saturnian longitude system based on kilometric radio emissions
Journal of geophysical research. Space physics, Vol.113(A5), pp.05222-n/a
05/2008
DOI: 10.1029/2007JA012861
Abstract
The period of Saturn kilometric radiation modulation as determined by Voyager forms the basis for a longitude system (SLS) recognized by the International Astronomical Union. However, Ulysses and Cassini observations have shown that this modulation period varies by the order of one percent on timescales of a few years and, hence, does not represent the internal rotation period of the planet. A new longitude system was proposed based on ˜2 years of Cassini observations of the kilometric radio emissions and accounts for the variable radio period (SLS2) valid over the time interval from day 001, 2004 through day 240, 2006. Early uses of this longitude system have revealed a number of magnetospheric phenomena which appear to be locked to the radio period, such as variations in the external magnetic field, the plasma density in the inner magnetosphere, and enhanced intensities of energetic ions. Analysis of the radio emissions since the new system was proposed revealed that the radio period continued to evolve, even showing a second, shorter period at times. The subsolar longitude of the peak of Saturn kilometric radio emissions begins to deviate from that given by the SLS2 system almost immediately after the previous analysis interval. Here, we provide a definition for SLS3, an extension to the longitude system valid over the interval from day 001, 2004 through day 222, 2007 based on variable period radio emissions.
Details
- Title: Subtitle
- An update to a Saturnian longitude system based on kilometric radio emissions
- Creators
- William S. Kurth - University of IowaTerry F. Averkamp - University of IowaDonald A. Gurnett - University of IowaJ. B. Groene - University of IowaAlain Lecacheux - Observatoire de Paris
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.113(A5), pp.05222-n/a
- Publisher
- American Geophysical Union/Wiley
- DOI
- 10.1029/2007JA012861
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Language
- English
- Date published
- 05/2008
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455279902771
Metrics
2 Record Views