Incoherent scatter radar study of the terdiurnal tide in the E‐ and F‐region heights at Arecibo

Gong, Yun; Zhou, Qihou

doi:10.1029/2011gl048318

Cited by 32 publications

(36 citation statements)

References 23 publications

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“…However, he did not discuss the vertical structure of the F region tidal waves in winter condition. Based on the Arecibo ISR measurements in January 2010, Gong and Zhou (2011) and Gong et al (2013) revealed the vertical structure of DT, SDT, TDT, and QDT in the F region. Our present observations are consistent with previous Arecibo results in that the DT is the dominant tidal component in the F region during winter, and the phases of the DT and SDT in the F region are largely constant.…”

Section: Resultsmentioning

confidence: 99%

A Study on the Quarterdiurnal Tide in the Thermosphere at Arecibo During the February 2016 Sudden Stratospheric Warming Event

Gong

et al. 2018

Geophysical Research Letters

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Using data collected from the Arecibo incoherent scatter radar during 5–10 February 2016, we present a study on the quarterdiurnal tide (QDT) from 250 to 360 km. A sudden stratospheric warming (SSW) event occurred on 8 February coincided with our observation. The maximum amplitude of the QDT, at ~37 m/s, is comparable with the diurnal tide and much larger than the semidiurnal tide. The QDT is largely evanescent. Our results manifest that the F region QDT could be as important as the diurnal and semidiurnal tides. The tidal waves show large variability before and after the commencement of the SSW. Our analysis indicates that the enhancement of the QDT is most likely due to the effect of the SSW. Nonlinear interaction of the diurnal tide with the terdiurnal tide is found to play a significant role in amplifying the QDT during the SSW event.

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Section: Resultsmentioning

confidence: 99%

A Study on the Quarterdiurnal Tide in the Thermosphere at Arecibo During the February 2016 Sudden Stratospheric Warming Event

Gong

et al. 2018

Geophysical Research Letters

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“…With the electric field relatively weak during the second interval, we see that the variation of HmF 2 correlates with the tidal wind very well during night. A detailed study on the terdiurnal tide for the Jan. 14–23 period can be found in Gong and Zhou [2011].…”

Section: Discussionmentioning

confidence: 99%

“…We adopted a linear regularization method used by Sulzer et al [2005] to convert LOS ion velocities to vector ion velocities. The meridional wind (positive southward) in the geomagnetic coordinate is derived using the same approach as that used in Gong and Zhou [2011]. The meridional wind is related to the drift and ambipolar diffusion along the field line via,

u_{s} = (v_{italicap} - v_{d}) sec I,

where v ap is the anti‐parallel ion drift, I denotes the dip angle, and v d is the diffusion velocity (positive upward).…”

Section: Data Processing and Presentationmentioning

confidence: 99%

Midnight ionosphere collapse at Arecibo and its relationship to the neutral wind, electric field, and ambipolar diffusion

et al. 2012

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[1] We report the analysis of "midnight collapse," a large drop in the F-layer peak height (HmF2) around midnight, observed at Arecibo during Jan. 14-22, 2010. During the nine nights of observations, the first four nights (Jan. 14-17) exhibited modest drops in HmF2 while the last five nights (Jan. 18-22) showed more severe drops. We examine the roles played by the meridional wind, electric field, and ambipolar diffusion in driving the vertical ion motion. The collapse process can be classified into three stages: preconditioning, initial descent, and sustained descent. Severe collapses occur when HmF2 is preconditioned high prior to the collapse. Ambipolar diffusion is most important during the initial descent. Neutral wind and electric field are responsible for sustaining the collapse. During Jan. 18-22, HmF2 was pushed high by the neutral wind before the collapse started. Neutral wind and electric field were in phase during the sustained severe collapses. The diurnal tide of the meridional wind provided the general condition for the collapses. The terdiurnal tide was most important to cause the difference between the two periods in our observation. Previous studies largely emphasized meridional wind being the dominant mechanism causing midnight collapse. Our study suggests that electric field and ambipolar diffusion also play an important role and the former can be the most dominant factor in some cases.Citation: Gong, Y., Q. Zhou, S. Zhang, N. Aponte, M. Sulzer, and S. Gonzalez (2012), Midnight ionosphere collapse at Arecibo and its relationship to the neutral wind, electric field, and ambipolar diffusion,

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“…Our previous study [Chen et al, 2013] shows that a varying ω decreasing from 0.9 to 0.4 combined with c 1 = c 2 = 2 is better than a constant setting of ω = 0.729 and c 1 = c 2 = 1.49445 for ISS fitting.…”

Section: Particle Swarm Optimizermentioning

confidence: 99%

Application of particle swarm optimization method to incoherent scatter radar measurement of ionosphere parameters

Zhou

Chen

et al. 2015

JGR Space Physics

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Simultaneous derivation of multiple ionospheric parameters from the incoherent scatter power spectra in the F 1 region is difficult because the spectra have only subtle differences for different combinations of parameters. In this study, we apply a particle swarm optimizer (PSO) to incoherent scatter power spectrum fitting and compare it to the commonly used least squares fitting (LSF) technique. The PSO method is found to outperform the LSF method in practically all scenarios using simulated data. The PSO method offers the advantages of not being sensitive to initial assumptions and allowing physical constraints to be easily built into the model. When simultaneously fitting for molecular ion fraction (f m ), ion temperature (T i ), and ratio of ion to electron temperature (γ T ), γ T is largely stable. The uncertainty between f m and T i can be described as a quadratic relationship. The significance of this result is that T i can be retroactively corrected for data archived many years ago where the assumption of f m may not be accurate, and the original power spectra are unavailable. In our discussion, we emphasize the fitting for f m , which is a difficult parameter to obtain. PSO method is often successful in obtaining f m , whereas LSF fails. We apply both PSO and LSF to actual observations made by the Arecibo incoherent scatter radar. The results show that PSO method is a viable method to simultaneously determine ion and electron temperatures and molecular ion fraction when the last is greater than 0.3.

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Incoherent scatter radar study of the terdiurnal tide in the E‐ and F‐region heights at Arecibo

Cited by 32 publications

References 23 publications

A Study on the Quarterdiurnal Tide in the Thermosphere at Arecibo During the February 2016 Sudden Stratospheric Warming Event

A Study on the Quarterdiurnal Tide in the Thermosphere at Arecibo During the February 2016 Sudden Stratospheric Warming Event

Midnight ionosphere collapse at Arecibo and its relationship to the neutral wind, electric field, and ambipolar diffusion

Application of particle swarm optimization method to incoherent scatter radar measurement of ionosphere parameters

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