Morphology of atmospheric refraction index variations at different altitudes from GPS/MET satellite observations

Гаврилов, Н. М.; Karpova, N. V.; Jacobi, Ch.; Gavrilov, Alexander

doi:10.1016/j.jastp.2004.01.031

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…E s effects on the variance are extended to tangent heights as low as $40 km, which can be identified as a coherent variation with its structure at 105 km. In the lower atmosphere, large variances are found slightly above the tropopause and below 10 km, similar to the distribution found with GPS/MET data (Gavrilov et al, 2004). Because waves from the lower atmosphere can propagate and grow in amplitude with height, neutral atmospheric variabilities can become significant by overcoming the measurement noise or ionospheric residuals at high altitudes.…”

Section: Article In Presssupporting

confidence: 77%

“…Several studies made direct use of the highresolution SNR and phase data (e.g., Igarashi et al, 2002;Pavelyev et al, 2003;Gavrilov et al, 2004;Wu et al, 2005), but much work is needed to understand the nature of the scintillation problem. GPS occultation is operated at two L-band frequencies: L1 ¼ 1.6 GHz and L2 ¼ 1.2 GHz, between LEO receivers and GPS transmitters.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Small-scale fluctuations and scintillations in high-resolution GPS/CHAMP SNR and phase data

2006

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Article In Presssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Small-scale fluctuations and scintillations in high-resolution GPS/CHAMP SNR and phase data

2006

Journal of Atmospheric and Solar-Terrestrial Physics

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“…Such observed fields can be obtained from radio occultation (RO) measurements based on radio links between a GPS satellite and a low-Earth orbiting (LEO) satellite (Kursinski et al, 1997). Since GPS ROs deliver temperature profiles in the upper troposphere and lower stratosphere, temperature fluctuations can be obtained by removing the background either through vertical or horizontal detrending (e.g., Tsuda et al, 2000;Gavrilov et al, 2004;Ern et al, 2011;Schmidt et al, 2016). Then, potential energy E p can be obtained from the temperature fluctuations, and E p is one measure for GW activity.…”

Section: Introductionmentioning

confidence: 99%

On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation

et al. 2017

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Abstract.A mechanistic global circulation model is used to simulate the Southern Hemisphere stratospheric, mesospheric, and lower thermospheric circulation during austral winter. The model includes a gravity wave (GW) parameterization that is initiated by prescribed 2-D fields of GW parameters in the troposphere. These are based on observations of GW potential energy calculated using GPS radio occultations and show enhanced GW activity east of the Andes and around the Antarctic. In order to detect the influence of an observation-based and thus realistic 2-D GW distribution on the middle atmosphere circulation, we perform model experiments with zonal mean and 2-D GW initialization, and additionally with and without forcing of stationary planetary waves (SPWs) at the lower boundary of the model. As a result, we find additional forcing of SPWs in the stratosphere, a weaker zonal wind jet in the mesosphere, cooling of the mesosphere and warming near the mesopause above the jet. SPW wavenumber 1 (SPW1) amplitudes are generally increased by about 10 % when GWs are introduced being longitudinally dependent. However, at the upper part of the zonal wind jet, SPW1 in zonal wind and GW acceleration are out of phase, which reduces the amplitudes there.

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“…If we denote the wavelength of the wave in a medium λ, its wavelength in vacuum is λ 0 , wave frequency f and wave's velocity v, then the common refractive index can be written as follows [1,2,5,6,8,11,[14][15][16][19][20][21]:…”

Section: Briefly On the Refractive Indexes And The Related Velocitiesmentioning

confidence: 99%

“…The refractive index (n) contains in itself almost interactions among the propagating electromagnetic wave and the medium parameters being in the ionized region [1,5,6,11,[14][15][16][18][19][20][21]. Commonly, the phenomena of photo ionization, recombination, diffusion, photon absorption, and emission of ions as well as emission of electrons always take place in this region.…”

Section: General Expression Of Complex Refractive Index In the Ionospmentioning

confidence: 99%

Numerical Estimation of the Complex Refractive Indexes by the Altitude Depending on Wave Frequency in the Ionized Region of the Earth Atmosphere for Microwaves Information and Power Transmissions

Nguyen¹,

Dao²,

Tran³

et al. 2016

PIER M

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Abstract-The phase and group refractive indexes of microwaves in the ionosphere region of the earth atmosphere are very important for both the researching theoretical problems and practical problems in wireless information transmission (WIT) and wireless power transmission (WPT). So far, there have been many attempts devoted to discussing and determining characterizations of earth atmosphere's ionosphere region including the refractive indexes of microwaves concerning their velocities in ionized region, unfortunately due to the complicated features of the ionosphere region leading to research task facing many challenges. Up to recent, there is still a lack of systematic numerical data of complex refractive index by altitude depending on high frequencies of the electromagnetic waves in the ionosphere region. This paper outlines some theoretical analyses and discussions of some theoretical aspects of the complex refractive index in atmosphere's ionized region more in detail. Based on conductivities data and the complex relative permittivity by altitude determined previously, the numerically estimated data of complex refractive indexes by the altitude from 100 km up to 1000 km at the different frequencies are also shown and discussed.

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Morphology of atmospheric refraction index variations at different altitudes from GPS/MET satellite observations

Cited by 12 publications

References 22 publications

Small-scale fluctuations and scintillations in high-resolution GPS/CHAMP SNR and phase data

Small-scale fluctuations and scintillations in high-resolution GPS/CHAMP SNR and phase data

On the influence of zonal gravity wave distributions on the Southern Hemisphere winter circulation

Numerical Estimation of the Complex Refractive Indexes by the Altitude Depending on Wave Frequency in the Ionized Region of the Earth Atmosphere for Microwaves Information and Power Transmissions

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