NeXtYZ: Three‐dimensional electron density inversion for dynasonde ionograms

Zabotin, N. A.; Wright, J. W.; Zhbankov, G. A.

doi:10.1029/2005rs003352

Cited by 77 publications

(67 citation statements)

References 17 publications

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“…Indeed, there is supporting evidence from a colocated HF sounder for such a tilt. The ionogram inversion program "NeXtYZ" reconstructs an electron density profile allowing for a horizontal gradients and tilts as described in more detail by Zabotin et al [2006]. A wedge-stratified ionospheric model is used instead of the traditional plane-stratified ionosphere.…”

Section: Resultsmentioning

confidence: 99%

Angular dependence of pump-induced bottomside and topside ionospheric plasma turbulence at EISCAT

et al. 2011

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[1] We experimentally observe the location and angular size of the high-frequency (HF) radio window in the bottomside ionosphere, which permits radio wave propagation to the topside ionosphere, with high angular resolution at the European Incoherent Scatter (EISCAT) facility. HF pump-induced ion line enhancements were observed by the EISCAT UHF incoherent scatter radar on the ionospheric bottomside and topside. The radar zenith angle was scanned in small steps in the magnetic meridian. The HF pump duty cycle was deliberately kept low enough to minimize the growth of artificial field-aligned irregularities. The locations of the bottomside radio window and topside enhanced radar echoes are consistent with the expected position determined by ray tracing performed using the observed plasma densities.

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Section: Resultsmentioning

confidence: 99%

Angular dependence of pump-induced bottomside and topside ionospheric plasma turbulence at EISCAT

et al. 2011

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“…Decay time T of infragravity waves is shown as a function of wave frequency for ocean depths H = 2,000, 4,000, and 6,000 m. IGW attenuation is calculated assuming an isothermal atmosphere with sound speed c s = 330 m/s. altitudes (Wright and Pitteway 1999;Zabotin et al 2006). The transition from the echo ranges measured in the socalled virtual space (where the difference between the group speed of the high-frequency (HF) electromagnetic waves in plasma and the vacuum speed of light is neglected) to actual spatial coordinates is essential for accuracy of our analysis.…”

Section: Experiments Methodsmentioning

confidence: 99%

“…The transition from the echo ranges measured in the socalled virtual space (where the difference between the group speed of the high-frequency (HF) electromagnetic waves in plasma and the vacuum speed of light is neglected) to actual spatial coordinates is essential for accuracy of our analysis. A component of Dynasonde data analysis software, the 3-D plasma density inversion procedure NeXtYZ (Zabotin et al 2006), finds 3-D spatial location of the reflection point of each echo. The inversion procedure possesses the accuracy and sensitivity, which are necessary to visualize and measure wave activity in the upper atmosphere.…”

Section: Experiments Methodsmentioning

confidence: 99%

“…Measured power spectra of velocities' fluctuations along the magnetic field line at an altitude of 150 km are compared with predicted contributions due to atmospheric waves radiated by infragravity waves in the ocean. The spectra are measured by radio sounding of the ionosphere using an onshore Dynasonde (Wright and Pitteway 1999;Zabotin et al 2006) HF radar system located at NASA's Wallops Island Flight Facility, Virginia, USA. The five panels refer to five distinct seasons in 2013 to 2014, and each panel contains four experimental spectral estimates obtained from the data series, specific dates and times of which are listed in the text.…”

Section: Experiments Methodsmentioning

confidence: 99%

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Acoustic-gravity waves in the atmosphere generated by infragravity waves in the ocean

Godin

Zabotin

Bullett

2015

Earth Planets Space

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Infragravity waves are surface gravity waves in the ocean with periods longer than approximately 30 s. Infragravity waves propagate transoceanic distances and, because of their long wavelengths, provide a mechanism for coupling wave processes in the ocean, atmosphere, and the solid Earth. Here, we present a strict physical justification for the hypothesis that background ocean waves may generate waves in the upper atmosphere. We show that, at frequencies below a certain transition frequency of about 3 mHz, infragravity waves continuously radiate their energy into the upper atmosphere in the form of acoustic-gravity waves. Based on ionospheric observations and estimates of the fluxes of the mechanical energy and momentum from the deep ocean, we conclude that acoustic-gravity waves of oceanic origin may have an observable impact on the upper atmosphere. We anticipate our work to be a starting point for a detailed analysis of global manifestations of the ocean-generated background acoustic-gravity waves.

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“…The magnetic local time is approximately UTC + 2.5 h. The altitude of COSMOS satellites is approximately 1000 km and the duration of measurements from an overflight is roughly 10 min. For the ionosonde prior mean the NeXtYZ (Zabotin et al, 2006) analyzed EISCAT dynasonde results from Tromsø (see Sect. Data availability) were collected.…”

Section: Methodsmentioning

confidence: 99%

Bayesian statistical ionospheric tomography improved by incorporating ionosonde measurements

et al. 2016

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Abstract. We validate two-dimensional ionospheric tomography reconstructions against EISCAT incoherent scatter radar measurements. Our tomography method is based on Bayesian statistical inversion with prior distribution given by its mean and covariance. We employ ionosonde measurements for the choice of the prior mean and covariance parameters and use the Gaussian Markov random fields as a sparse matrix approximation for the numerical computations. This results in a computationally efficient tomographic inversion algorithm with clear probabilistic interpretation.We demonstrate how this method works with simultaneous beacon satellite and ionosonde measurements obtained in northern Scandinavia. The performance is compared with results obtained with a zero-mean prior and with the prior mean taken from the International Reference Ionosphere 2007 model. In validating the results, we use EISCAT ultrahigh-frequency incoherent scatter radar measurements as the ground truth for the ionization profile shape.We find that in comparison to the alternative prior information sources, ionosonde measurements improve the reconstruction by adding accurate information about the absolute value and the altitude distribution of electron density. With an ionosonde at continuous disposal, the presented method enhances stand-alone near-real-time ionospheric tomography for the given conditions significantly.

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NeXtYZ: Three‐dimensional electron density inversion for dynasonde ionograms

Cited by 77 publications

References 17 publications

Angular dependence of pump-induced bottomside and topside ionospheric plasma turbulence at EISCAT

Angular dependence of pump-induced bottomside and topside ionospheric plasma turbulence at EISCAT

Acoustic-gravity waves in the atmosphere generated by infragravity waves in the ocean

Bayesian statistical ionospheric tomography improved by incorporating ionosonde measurements

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