A Multivariable Study of a Traveling Ionosphere Disturbance Using the Arecibo Incoherent Scatter Radar.
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| Title: | A Multivariable Study of a Traveling Ionosphere Disturbance Using the Arecibo Incoherent Scatter Radar. |
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| Authors: | Zhou, Qihou1 (AUTHOR) liy27@miamioh.edu, Li, Yanlin1 (AUTHOR), Gong, Yun2 (AUTHOR) |
| Source: | Remote Sensing. Nov2024, Vol. 16 Issue 21, p4104. 10p. |
| Subjects: | Gravity waves, Incoherent scattering, Ionosphere, Ion temperature, Inductive effect |
| Abstract: | We present the first simultaneous observations of a traveling ionosphere wave (TID) event, measuring electron concentration ( N e ), vertical plasma drift ( V z ), and ion and electron temperatures ( T i , T e ) using the Arecibo incoherent scatter radar. A TID with a period of 135 min was evident in all four state variables in the thermosphere. The amplitudes of V z and relative T i fluctuations show only small height variations from 200 to 500 km and their vertical wavelengths increase with altitude. The T e fluctuation shows different characteristics from EISCAT in both phase and amplitude. When the geomagnetic dip angle is 45°, half of the driving gravity wave's (GW's) equatorward velocity is mapped to V z . This meridional-to-vertical velocity coupling amplifies GW's effect in N e through vertical transport. The amplifying and anisotropic effects of the geomagnetic field explain the ubiquitous presence of TIDs and their preferred equatorward propagation direction in the geomagnetic mid-latitudes, as well as the midnight collapse phenomenon observed at Arecibo. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | We present the first simultaneous observations of a traveling ionosphere wave (TID) event, measuring electron concentration ( N e ), vertical plasma drift ( V z ), and ion and electron temperatures ( T i , T e ) using the Arecibo incoherent scatter radar. A TID with a period of 135 min was evident in all four state variables in the thermosphere. The amplitudes of V z and relative T i fluctuations show only small height variations from 200 to 500 km and their vertical wavelengths increase with altitude. The T e fluctuation shows different characteristics from EISCAT in both phase and amplitude. When the geomagnetic dip angle is 45°, half of the driving gravity wave's (GW's) equatorward velocity is mapped to V z . This meridional-to-vertical velocity coupling amplifies GW's effect in N e through vertical transport. The amplifying and anisotropic effects of the geomagnetic field explain the ubiquitous presence of TIDs and their preferred equatorward propagation direction in the geomagnetic mid-latitudes, as well as the midnight collapse phenomenon observed at Arecibo. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20724292 |
| DOI: | 10.3390/rs16214104 |
