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| Titel |
Statistical behavior of Langmuir wave packets observed inside the electron foreshock of Saturn |
| VerfasserIn |
David Pisa, George B. Hospodarsky, Willam S. Kurth, Donald A. Gurnett, Ondrej Santolik, Jan Soucek |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250090316
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| Publikation (Nr.) |
 EGU/EGU2014-4544.pdf |
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| Zusammenfassung |
| We present a statistical study of Langmuir wave packets in the Saturnian foreshock using
Cassini Wideband Receiver electric field waveforms. We analyzed all foreshock crossings
from 2004 to 2012 using an automatic method for the identification of Langmuir wave
signatures. Observed waveforms exhibit a shape similar to Langmuir solitons or
monochromatic wave packets with a slowly varying envelope. This is in agreement with a
variety of previous observations of Langmuir waves in the terrestrial foreshock and
associated with Type III radio bursts. We determined the peak amplitude for all wave
packets, and found the distributions of amplitude appeared to follow a power law
with P(E) - E-2. We confirm that the most intense electron plasma waves are
observed near the foreshock boundary. We estimated the energy density ratio to be
about one order below previously reported values at Saturn. Finally, we discuss the
properties of the Langmuir wave packets at different locations in the foreshock. |
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