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Long-Term Observations of the Thermospheric 6 h Oscillation Revealed by an Incoherent Scatter Radar over Arecibo.

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Title: Long-Term Observations of the Thermospheric 6 h Oscillation Revealed by an Incoherent Scatter Radar over Arecibo.
Authors: Gong, Yun1 (AUTHOR) dingyaxuan@whu.edu.cn, Ding, Yaxuan1 (AUTHOR) chenxinkun@whu.edu.cn, Chen, Xinkun1 (AUTHOR) zsd@whu.edu.cn, Zhang, Shaodong1,2 (AUTHOR) mazheng@whu.edu.cn, Zhou, Qihou3 (AUTHOR) zhouq@miamioh.edu, Ma, Zheng1 (AUTHOR) luojiahui@whu.edu.cn, Luo, Jiahui1 (AUTHOR)
Source: Remote Sensing. Nov2023, Vol. 15 Issue 21, p5098. 13p.
Subjects: Incoherent scattering, Arecibo Observatory, Oscillations, Solar oscillations, Radar, Solar activity, Geomagnetism, Solar cycle
Abstract: We present an analysis of 6 h oscillations in the thermosphere ranging from 150 km to 400 km. The analysis applies 134 days of data from an incoherent scatter radar located at Arecibo Observatory (18.3°N, 66.7°W) from 1984 to 2015. To our knowledge, the climatological and seasonal characteristics of the 6 h oscillations in the thermosphere were investigated for the first time over Arecibo. The climatological mean amplitude of the 6 h oscillation in the thermosphere is about 11 m/s, and it increases slowly with altitude above 225 km. The climatological mean amplitude of the 6 h oscillation is comparable with semidiurnal and terdiurnal tides at Arecibo above 250 km. The climatological mean phase exhibits limited vertical variation. The 6 h oscillation is the most prominent in autumn, with amplitudes reaching around 20 m/s compared to approximately 10 m/s in other seasons. The phase structure in all seasons exhibits weak vertical variations. The responses of the thermospheric 6 h oscillation to solar and geomagnetic activities are also analyzed in this study. Our results indicate that at low latitude, solar activities have a small impact on the variation in the thermospheric 6 h oscillation, while it appears that the amplitude of the 6 h oscillation increases with increasing geomagnetic activity. Above 250 km, the amplitude of the 6 h oscillation reaches ~20 m/s during strong geomagnetic activity, which is almost twice of that occurring during weak geomagnetic activity. [ABSTRACT FROM AUTHOR]
Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Long-Term Observations of the Thermospheric 6 h Oscillation Revealed by an Incoherent Scatter Radar over Arecibo.
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  Data: <searchLink fieldCode="AR" term="%22Gong%2C+Yun%22">Gong, Yun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> dingyaxuan@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Ding%2C+Yaxuan%22">Ding, Yaxuan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> chenxinkun@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Chen%2C+Xinkun%22">Chen, Xinkun</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> zsd@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhang%2C+Shaodong%22">Zhang, Shaodong</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> mazheng@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zhou%2C+Qihou%22">Zhou, Qihou</searchLink><relatesTo>3</relatesTo> (AUTHOR)<i> zhouq@miamioh.edu</i><br /><searchLink fieldCode="AR" term="%22Ma%2C+Zheng%22">Ma, Zheng</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> luojiahui@whu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Luo%2C+Jiahui%22">Luo, Jiahui</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Remote+Sensing%22">Remote Sensing</searchLink>. Nov2023, Vol. 15 Issue 21, p5098. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Incoherent+scattering%22">Incoherent scattering</searchLink><br /><searchLink fieldCode="DE" term="%22Arecibo+Observatory%22">Arecibo Observatory</searchLink><br /><searchLink fieldCode="DE" term="%22Oscillations%22">Oscillations</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+oscillations%22">Solar oscillations</searchLink><br /><searchLink fieldCode="DE" term="%22Radar%22">Radar</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+activity%22">Solar activity</searchLink><br /><searchLink fieldCode="DE" term="%22Geomagnetism%22">Geomagnetism</searchLink><br /><searchLink fieldCode="DE" term="%22Solar+cycle%22">Solar cycle</searchLink>
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  Data: We present an analysis of 6 h oscillations in the thermosphere ranging from 150 km to 400 km. The analysis applies 134 days of data from an incoherent scatter radar located at Arecibo Observatory (18.3°N, 66.7°W) from 1984 to 2015. To our knowledge, the climatological and seasonal characteristics of the 6 h oscillations in the thermosphere were investigated for the first time over Arecibo. The climatological mean amplitude of the 6 h oscillation in the thermosphere is about 11 m/s, and it increases slowly with altitude above 225 km. The climatological mean amplitude of the 6 h oscillation is comparable with semidiurnal and terdiurnal tides at Arecibo above 250 km. The climatological mean phase exhibits limited vertical variation. The 6 h oscillation is the most prominent in autumn, with amplitudes reaching around 20 m/s compared to approximately 10 m/s in other seasons. The phase structure in all seasons exhibits weak vertical variations. The responses of the thermospheric 6 h oscillation to solar and geomagnetic activities are also analyzed in this study. Our results indicate that at low latitude, solar activities have a small impact on the variation in the thermospheric 6 h oscillation, while it appears that the amplitude of the 6 h oscillation increases with increasing geomagnetic activity. Above 250 km, the amplitude of the 6 h oscillation reaches ~20 m/s during strong geomagnetic activity, which is almost twice of that occurring during weak geomagnetic activity. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Incoherent scattering
        Type: general
      – SubjectFull: Arecibo Observatory
        Type: general
      – SubjectFull: Oscillations
        Type: general
      – SubjectFull: Solar oscillations
        Type: general
      – SubjectFull: Radar
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      – SubjectFull: Solar activity
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      – SubjectFull: Geomagnetism
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      – TitleFull: Long-Term Observations of the Thermospheric 6 h Oscillation Revealed by an Incoherent Scatter Radar over Arecibo.
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              M: 11
              Text: Nov2023
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