Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde at Jicamarca

Jann Yenq Liu; Chien Chih Lee; Jhih Yung Yang; Chao Yen Chen; Bodo W. Reinisch

doi:10.1007/s10291-009-0150-3

Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde at Jicamarca

Jann Yenq Liu, Chien Chih Lee, Jhih Yung Yang, Chao Yen Chen, Bodo W. Reinisch

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

We examine for the first time the ionospheric electron density profiles concurrently observed by the GPS occultation experiment (GOX) onboard the FORMOSAT-3/COSMIC (F3/C) and the ground-based digisonde portable sounder DPS-4 at Jicamarca (12°S, 283°W, 1°N geomagnetic) in 2007. Our results show that the F3/C generally underestimates the F2-peak electron density NmF2 and the F2-peak height hmF2. On the other hand, when the equatorial ionization anomaly (EIA) pronouncedly appears during daytime, the total electron content (TEC) derived from the radio occultation of the GPS signal recorded by the F3/C GOX is significantly enhanced. This results in the NmF2 at Jicamarca being overestimated by the Abel inversion on the enhanced TEC during the afternoon period.

Original language	English
Pages (from-to)	75-81
Number of pages	7
Journal	GPS Solutions
Volume	14
Issue number	1
DOIs	https://doi.org/10.1007/s10291-009-0150-3
State	Published - Jan 2010

Keywords

Digisonde
Equatorial ionization anomaly
FORMOSAT-3/COSMIC
HmF2
NmF2

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@article{04d6447ccbcf4cf8b26df7243d6b95f1,

title = "Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde at Jicamarca",

abstract = "We examine for the first time the ionospheric electron density profiles concurrently observed by the GPS occultation experiment (GOX) onboard the FORMOSAT-3/COSMIC (F3/C) and the ground-based digisonde portable sounder DPS-4 at Jicamarca (12°S, 283°W, 1°N geomagnetic) in 2007. Our results show that the F3/C generally underestimates the F2-peak electron density NmF2 and the F2-peak height hmF2. On the other hand, when the equatorial ionization anomaly (EIA) pronouncedly appears during daytime, the total electron content (TEC) derived from the radio occultation of the GPS signal recorded by the F3/C GOX is significantly enhanced. This results in the NmF2 at Jicamarca being overestimated by the Abel inversion on the enhanced TEC during the afternoon period.",

keywords = "Digisonde, Equatorial ionization anomaly, FORMOSAT-3/COSMIC, HmF2, NmF2",

author = "Liu, {Jann Yenq} and Lee, {Chien Chih} and Yang, {Jhih Yung} and Chen, {Chao Yen} and Reinisch, {Bodo W.}",

note = "Funding Information: Acknowledgments This research work has been supported by the projects of National Space Organization to the National Central University, 98-NSPO(B)-IC-FA07-01(L) and to Ching-Yun University, F2-peak at Jicamarca. The pink dots are the tangent point of occultation ray paths. The vertical black lines denote the geomagnetic location (or the Jicamarca latitude). The color bar denotes the ionospheric electron density in electron/cm3 98-NSPO(B)-IC-FA07-01(R). BWR was supported by Air Force contract FA8718-06-C-0072.",

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doi = "10.1007/s10291-009-0150-3",

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volume = "14",

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T1 - Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde at Jicamarca

AU - Liu, Jann Yenq

AU - Lee, Chien Chih

AU - Yang, Jhih Yung

AU - Chen, Chao Yen

AU - Reinisch, Bodo W.

N1 - Funding Information: Acknowledgments This research work has been supported by the projects of National Space Organization to the National Central University, 98-NSPO(B)-IC-FA07-01(L) and to Ching-Yun University, F2-peak at Jicamarca. The pink dots are the tangent point of occultation ray paths. The vertical black lines denote the geomagnetic location (or the Jicamarca latitude). The color bar denotes the ionospheric electron density in electron/cm3 98-NSPO(B)-IC-FA07-01(R). BWR was supported by Air Force contract FA8718-06-C-0072.

PY - 2010/1

Y1 - 2010/1

N2 - We examine for the first time the ionospheric electron density profiles concurrently observed by the GPS occultation experiment (GOX) onboard the FORMOSAT-3/COSMIC (F3/C) and the ground-based digisonde portable sounder DPS-4 at Jicamarca (12°S, 283°W, 1°N geomagnetic) in 2007. Our results show that the F3/C generally underestimates the F2-peak electron density NmF2 and the F2-peak height hmF2. On the other hand, when the equatorial ionization anomaly (EIA) pronouncedly appears during daytime, the total electron content (TEC) derived from the radio occultation of the GPS signal recorded by the F3/C GOX is significantly enhanced. This results in the NmF2 at Jicamarca being overestimated by the Abel inversion on the enhanced TEC during the afternoon period.

AB - We examine for the first time the ionospheric electron density profiles concurrently observed by the GPS occultation experiment (GOX) onboard the FORMOSAT-3/COSMIC (F3/C) and the ground-based digisonde portable sounder DPS-4 at Jicamarca (12°S, 283°W, 1°N geomagnetic) in 2007. Our results show that the F3/C generally underestimates the F2-peak electron density NmF2 and the F2-peak height hmF2. On the other hand, when the equatorial ionization anomaly (EIA) pronouncedly appears during daytime, the total electron content (TEC) derived from the radio occultation of the GPS signal recorded by the F3/C GOX is significantly enhanced. This results in the NmF2 at Jicamarca being overestimated by the Abel inversion on the enhanced TEC during the afternoon period.

KW - Digisonde

KW - Equatorial ionization anomaly

KW - FORMOSAT-3/COSMIC

KW - HmF2

KW - NmF2

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JO - GPS Solutions

JF - GPS Solutions

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ER -

Electron density profiles in the equatorial ionosphere observed by the FORMOSAT-3/COSMIC and a digisonde at Jicamarca

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Keywords

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