Academic Journal
Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements
| العنوان: | Ion-acoustic solitary waves and spectrally uniform scattering cross section enhancements |
|---|---|
| المؤلفون: | J. Ekeberg, G. Wannberg, L. Eliasson, K. Stasiewicz |
| المصدر: | Annales Geophysicae, Vol 28, Pp 1299-1306 (2010) |
| بيانات النشر: | Copernicus Publications, 2010. |
| سنة النشر: | 2010 |
| المجموعة: | LCC:Science LCC:Physics LCC:Geophysics. Cosmic physics |
| مصطلحات موضوعية: | Science, Physics, QC1-999, Geophysics. Cosmic physics, QC801-809 |
| الوصف: | 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0992-7689 1432-0576 |
| Relation: | https://www.ann-geophys.net/28/1299/2010/angeo-28-1299-2010.pdf; https://doaj.org/toc/0992-7689; https://doaj.org/toc/1432-0576 |
| DOI: | 10.5194/angeo-28-1299-2010 |
| URL الوصول: | https://doaj.org/article/cc2fc75f0aef4bf4a3eb4c868452d871 |
| رقم الانضمام: | edsdoj.2fc75f0aef4bf4a3eb4c868452d871 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder كن أول من يترك تعليقا!