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| Titel |
Statistics of auroral Langmuir waves |
| VerfasserIn |
M. Samara, J. LaBelle, I. H. Cairns |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 26, no. 12 ; Nr. 26, no. 12 (2008-12-03), S.3885-3895 |
| Datensatznummer |
250016317
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| Publikation (Nr.) |
 copernicus.org/angeo-26-3885-2008.pdf |
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| Zusammenfassung |
| The Physics of Auroral Zone Electrons II (PHAZE II) sounding rocket was
launched in February 1997 into active pre-midnight aurora. The
resulting high frequency
wave data are dominated by Langmuir waves.
Consistent with many previous observations the
Langmuir
waves are sporadic, occurring
in bursts lasting up to a few hundred ms. We compute
statistics of the
electric field amplitudes of these Langmuir waves, with two results.
First, the shape of the distribution of running averages of the electric
field amplitudes
remains approximately stationary for a large range of
widths of running average less than
~0.3 ms and for a large range of
widths exceeding about 1 ms.
The
interpretation of this transition timescale is unclear but appears
unlikely to be of instrumental origin.
Second, for 2.6-ms running averages, corresponding to the
latter range, the distribution of the logarithm of
electric field amplitudes matches
a Gaussian form very well for all nine cases
studied in detail, hence the statistics
are lognormal. These distributions are consistent with stochastic growth theory
(SGT). |
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