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| Titel |
Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals |
| VerfasserIn |
A. G. Pavelyev, Y. A. Liou, K. Zhang, C. S. Wang, J. Wickert, T. Schmidt, V. N. Gubenko, A. A. Pavelyev, Y. Kuleshov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 1 ; Nr. 5, no. 1 (2012-01-04), S.1-16 |
| Datensatznummer |
250002306
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| Publikation (Nr.) |
 copernicus.org/amt-5-1-2012.pdf |
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| Zusammenfassung |
| By using the CHAllenge Minisatellite Payload (CHAMP) radio occultation (RO)
data, a description of different types of the ionospheric impacts on the RO
signals at the altitudes 30–90 km of the RO ray perigee is given and
compared with the results of measurements obtained earlier in the
satellite-to-Earth communication link at frequency 1.5415 GHz. An analytical
model is introduced for describing propagation of radio waves in a
stratified medium consisting of sectors with spherically symmetric
refractivity distribution. This model gives analytical expressions for the
phase, bending angle, and refractive attenuation of radio waves and is
applied to the analysis of radio wave propagation phenomena along an
extended path including the atmosphere and two parts of the ionosphere. The
model explains significant amplitude and phase variations at altitudes 30–90 km of the RO ray perigee and attributes them to inclined ionospheric layers.
Based on this analytical model, an innovative technique is introduced to
locate layers in the atmosphere and ionosphere. A necessary and sufficient
criterion is obtained for a layer to be located at the RO ray perigee. This
criterion gives both qualitative and quantitative estimation of the
displacement of an ionospheric and/or atmospheric layer from the RO ray
perigee. This is important, in particular, for determining the location of
wind shears and directions of the internal wave propagation in the lower
ionosphere, and, possibly, in the atmosphere. |
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