ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements
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ID: 252405
2010
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Abstract
Spectra measured by incoherent scatter radars are formed predominantly by
scattering of the incident signal off ion-acoustic and Langmuir waves in the
ionosphere. Occasionally, the upshifted and/or downshifted lines produced by
the ion-acoustic waves are enhanced well above thermal levels and referred to
as naturally enhanced ion-acoustic lines. In this paper, we study another
kind of enhancement, which is spectrally uniform over the whole ion-line,
i.e. the up- and downshifted shoulder and the spectral valley in between.
Based on observations made with the EISCAT Svalbard radar (ESR) facility, we
investigate the transient and spectrally uniform power enhancements, which
can be explained by ion-acoustic solitary waves. We use a theory of nonlinear
waves in a magnetized plasma to determine the properties of such waves and
evaluate their effects on scattered signals measured by ESR. We suggest a new
mechanism that can explain backscattered power enhancements by one order of
magnitude above the thermal level and show that it is consistent with
observations.
| Reference Key |
ekeberg2010annalesion-acoustic
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|---|---|
| Authors | ;J. Ekeberg;G. Wannberg;L. Eliasson;K. Stasiewicz;K. Stasiewicz |
| Journal | journal of food measurement and characterization |
| Year | 2010 |
| DOI |
10.5194/angeo-28-1299-2010
|
| URL | |
| Keywords |
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