Planetary Radio Emissions VII Proceedings of the 7th International Workshop on
Planetary, Solar and Heliospheric Radio Emissions held at Graz, Austria, September 15–17, 2010
|
Verlag der Österreichischen Akademie der Wissenschaften Austrian Academy of Sciences Press
A-1011 Wien, Dr. Ignaz Seipel-Platz 2
Tel. +43-1-515 81/DW 3420, Fax +43-1-515 81/DW 3400 https://verlag.oeaw.ac.at, e-mail: verlag@oeaw.ac.at |
|
DATUM, UNTERSCHRIFT / DATE, SIGNATURE
BANK AUSTRIA CREDITANSTALT, WIEN (IBAN AT04 1100 0006 2280 0100, BIC BKAUATWW), DEUTSCHE BANK MÜNCHEN (IBAN DE16 7007 0024 0238 8270 00, BIC DEUTDEDBMUC)
|
Planetary Radio Emissions VII Proceedings of the 7th International Workshop on
Planetary, Solar and Heliospheric Radio Emissions held at Graz, Austria, September 15–17, 2010
ISBN 978-3-7001-7125-6 Print Edition ISBN 978-3-7001-7246-8 Online Edition
Helmut Rucker
Space Research Institute, Austrian Academy of Sciences, Graz, Austria William Kurth Department of Physics and Astronomy, University of Iowa, Iowa City, USA Philippe Louarn Centre d'Etude Spatiale de Rayonnements, CNRS/Universitè Paul-Sabatier Toulouse III, Toulouse, France Georg Fischer Space Research Institute, Austrian Academy of Sciences, Graz, Austria
R. L. Mutel,
I. W. Christopher,
J. D. Menietti,
D. A. Gurnett,
J. S. Pickett,
A. Masson,
A. Fazakerley,
E. Lucek
S. 241 - 252 doi:10.1553/PRE7s241 Verlag der Österreichischen Akademie der Wissenschaften
Abstract: Recent Cluster WBD observations in the Earth’s auroral acceleration region have detected trapped Z mode auroral kilometric radiation while the spacecraft were entering a deep density cavity. The Z mode has a clear cutoff at the local upper hybrid resonance frequency, while RX mode radiation is detected above the RX mode cutoff frequency. The small gap between the upper hybrid resonance and the RX mode cutoff frequencies is proportional to the local electron density as expected from cold plasma theory. The width of the observed gap provides a new sensitive measure of the ambient electron density. In addition, the relative intensities of RX and Z mode radiation provide a sensitive probe of the plasma ß = ?pe/Oce at the source since the growth rates, although identical in form, have different ranges of allowed resonant radii which depend on ß. In particular, the RX mode growth is favored for low ß, while the Z mode is favored at higher ß. The observed mode intensities and ß’s appear to be consistent with this model, and favor generation of Z mode at the source over models in which Z mode is generated by mode-conversion at cavity boundaries. These are the first multi-point direct measurements of mode-specific AKR propagation in the auroral acceleration region of any planet. Published Online: 2011/12/28 14:37:55 Object Identifier: 0xc1aa5576 0x002a1d14 Rights: .
… The 7th International Workshop on "Planetary, Solar and Heliospheric Radio Emissions" is the continuation of an established tradition: This PRE VII conference followed previous successful international workshops held at Graz, Austria, in 1984, 1987, 1991, 1996, 2001, and 2005. This 7th workshop in September 2010 offered again the unique opportunity to discuss the observations from Cassini at Saturn and to investigate the measurements by other spacecraft and from the ground of the Jovian, terrestrial and solar radio emissions, also including studies on radiation from exoplanetary sources.
|
Verlag der Österreichischen Akademie der Wissenschaften Austrian Academy of Sciences Press
A-1011 Wien, Dr. Ignaz Seipel-Platz 2
Tel. +43-1-515 81/DW 3420, Fax +43-1-515 81/DW 3400 https://verlag.oeaw.ac.at, e-mail: verlag@oeaw.ac.at |