Intensity of low-latitude nighttime F-region ionospheric density irregularities observed by ROCSAT and ground-based GPS receivers in solar maximum

Yang Yi Sun; Jann Yenq Liu; Chi Kuang Chao; Chia Hung Chen

doi:10.1016/j.jastp.2014.12.013

Intensity of low-latitude nighttime F-region ionospheric density irregularities observed by ROCSAT and ground-based GPS receivers in solar maximum

Yang Yi Sun, Jann Yenq Liu, Chi Kuang Chao, Chia Hung Chen

地球科學系

研究成果: Article › 同行評審

11 引文斯高帕斯（Scopus）

摘要

This study examines the global correlation between the instantaneous total amplitude of ion density fluctuations observed by ROCSAT and the phase fluctuation of the total electron content (TEC) recorded by worldwide ground-based Global Positioning System (GPS) receivers during the high solar activity period of March 1999-December 2002 for Kp<3. The Hilbert-Huang transform (HHT) is applied to compute the instantaneous total amplitude of ROCSAT ion densities. The event-based and climatological comparisons of the total amplitude and occurrence probability of irregularities observed by ROCSAT show that the total amplitude can reveal both the occurrence probability of irregularities and the associated intensity. The noise level of the total amplitude is about 10^3.5 (near 3000) ions/cm³. The high correlation (correlation coefficient=0.81) between the GPS TEC phase fluctuation index F_P and instantaneous total amplitude of ROCSAT electron densities suggests that the total amplitude can be used to globally monitor the intensity of irregularities at equatorial and within the latitude belt of ±15°. The relationship between the ionospheric background ionization and the irregularity intensity is further investigated.

原文	English
頁（從 - 到）	92-101
頁數	10
期刊	Journal of Atmospheric and Solar-Terrestrial Physics
卷	123
DOIs	https://doi.org/10.1016/j.jastp.2014.12.013
出版狀態	Published - 2015 2月 1

All Science Journal Classification (ASJC) codes

地球物理
大氣科學
空間與行星科學

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10.1016/j.jastp.2014.12.013

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title = "Intensity of low-latitude nighttime F-region ionospheric density irregularities observed by ROCSAT and ground-based GPS receivers in solar maximum",

abstract = "This study examines the global correlation between the instantaneous total amplitude of ion density fluctuations observed by ROCSAT and the phase fluctuation of the total electron content (TEC) recorded by worldwide ground-based Global Positioning System (GPS) receivers during the high solar activity period of March 1999-December 2002 for Kp<3. The Hilbert-Huang transform (HHT) is applied to compute the instantaneous total amplitude of ROCSAT ion densities. The event-based and climatological comparisons of the total amplitude and occurrence probability of irregularities observed by ROCSAT show that the total amplitude can reveal both the occurrence probability of irregularities and the associated intensity. The noise level of the total amplitude is about 103.5 (near 3000) ions/cm3. The high correlation (correlation coefficient=0.81) between the GPS TEC phase fluctuation index FP and instantaneous total amplitude of ROCSAT electron densities suggests that the total amplitude can be used to globally monitor the intensity of irregularities at equatorial and within the latitude belt of ±15°. The relationship between the ionospheric background ionization and the irregularity intensity is further investigated.",

author = "Sun, {Yang Yi} and Liu, {Jann Yenq} and Chao, {Chi Kuang} and Chen, {Chia Hung}",

note = "Funding Information: This study is supported by the National Science Council Taiwan (NSC) grant NSC 102-2628-M-008-001 . The authors thank Shao-Ju Shan for providing many valuable suggestions on this study. The authors gratefully acknowledge the International GNSS Service (IGS) for providing GPS data. The GPS data for this paper are available at the Scripps Orbit and Permanent Array Center (SOPAC). The authors would like to thank the reviewers for their comments that helped improve the paper. Publisher Copyright: {\textcopyright} 2015 .",

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AU - Chen, Chia Hung

N1 - Funding Information: This study is supported by the National Science Council Taiwan (NSC) grant NSC 102-2628-M-008-001 . The authors thank Shao-Ju Shan for providing many valuable suggestions on this study. The authors gratefully acknowledge the International GNSS Service (IGS) for providing GPS data. The GPS data for this paper are available at the Scripps Orbit and Permanent Array Center (SOPAC). The authors would like to thank the reviewers for their comments that helped improve the paper. Publisher Copyright: © 2015 .

PY - 2015/2/1

Y1 - 2015/2/1

N2 - This study examines the global correlation between the instantaneous total amplitude of ion density fluctuations observed by ROCSAT and the phase fluctuation of the total electron content (TEC) recorded by worldwide ground-based Global Positioning System (GPS) receivers during the high solar activity period of March 1999-December 2002 for Kp<3. The Hilbert-Huang transform (HHT) is applied to compute the instantaneous total amplitude of ROCSAT ion densities. The event-based and climatological comparisons of the total amplitude and occurrence probability of irregularities observed by ROCSAT show that the total amplitude can reveal both the occurrence probability of irregularities and the associated intensity. The noise level of the total amplitude is about 103.5 (near 3000) ions/cm3. The high correlation (correlation coefficient=0.81) between the GPS TEC phase fluctuation index FP and instantaneous total amplitude of ROCSAT electron densities suggests that the total amplitude can be used to globally monitor the intensity of irregularities at equatorial and within the latitude belt of ±15°. The relationship between the ionospheric background ionization and the irregularity intensity is further investigated.

AB - This study examines the global correlation between the instantaneous total amplitude of ion density fluctuations observed by ROCSAT and the phase fluctuation of the total electron content (TEC) recorded by worldwide ground-based Global Positioning System (GPS) receivers during the high solar activity period of March 1999-December 2002 for Kp<3. The Hilbert-Huang transform (HHT) is applied to compute the instantaneous total amplitude of ROCSAT ion densities. The event-based and climatological comparisons of the total amplitude and occurrence probability of irregularities observed by ROCSAT show that the total amplitude can reveal both the occurrence probability of irregularities and the associated intensity. The noise level of the total amplitude is about 103.5 (near 3000) ions/cm3. The high correlation (correlation coefficient=0.81) between the GPS TEC phase fluctuation index FP and instantaneous total amplitude of ROCSAT electron densities suggests that the total amplitude can be used to globally monitor the intensity of irregularities at equatorial and within the latitude belt of ±15°. The relationship between the ionospheric background ionization and the irregularity intensity is further investigated.

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Intensity of low-latitude nighttime F-region ionospheric density irregularities observed by ROCSAT and ground-based GPS receivers in solar maximum

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