Artificial ionospheric wave number 4 structure below the F2 region due to the Abel retrieval of radio occultation measurements |
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| Authors: | Xinan Yue William S Schreiner Christian Rocken Ying-Hwa Kuo Jiuhou Lei |
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| Institution: | (1) COSMIC Program Office, University Corporation for Atmospheric Research, Boulder, CO, USA;(2) Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA |
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| Abstract: | We analyzed the effect of the Abel inversion on the wave number 4 (WN4) structure from the GPS radio occultation (RO)–measured
electron densities by using the FORMOSAT-3/COSMIC (F-3/C) observations under the equinox condition. The Abel-retrieved electron
density from both the F-3/C observations and the simulated results by an empirical model with an imposed WN4 structure in
the F layer are investigated. It is found that the Abel inversion can reproduce the real WN4 structure well in the F2 layer.
However, it will result in pseudo and reversed-phase WN4 structure in the lower altitude (F1 and E layers). Quantitatively,
relative ±15% WN4 signature in the F2 layer can produce ±40% artificial WN4 in the E and F1 layers. Analysis on the F-3/C
data shows about ±15% WN4 signature in the F2 layer and ±50% WN4 with reversed-phase in the E and F1 layers. The F-3/C-observed
WN4 structure in the E and F1 layers might be the combinations of the real WN4 signature and the artificial effects of Abel
retrieval. |
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