Results 1 to 10 of about 224,565 (189)

Diagnostic study of geomagnetic storm-induced ionospheric changes over very low-frequency signal propagation paths in the mid-latitude D region [PDF]

Annales Geophysicae, 2022
We performed a diagnostic study of geomagnetic storm-induced disturbances that are coupled to the mid-latitude D region by quantifying the propagation characteristics of very low-frequency (VLF) radio signals from transmitters located in Cumbria, UK ...
V. U. J. Nwankwo, W. Denig, S. K. Chakrabarti, O. Ogunmodimu, O. Ogunmodimu, M. P. Ajakaiye, J. O. Fatokun, P. I. Anekwe, O. E. Obisesan, O. E. Oyanameh, O. V. Fatoye   +10 more
doaj   +1 more source

Atmospheric drag effects on modelled low Earth orbit (LEO) satellites during the July 2000 Bastille Day event in contrast to an interval of geomagnetically quiet conditions [PDF]

Annales Geophysicae, 2021
In this work, we simulated the atmospheric drag effect on two model SmallSats (small satellites) in low Earth orbit (LEO) with different ballistic coefficients during 1-month intervals of solar–geomagnetic quiet and perturbed conditions. The goal of this
V. U. J. Nwankwo, W. Denig, S. K. Chakrabarti, M. P. Ajakaiye, J. Fatokun, A. W. Akanni, J.-P. Raulin, E. Correia, E. Correia, J. E. Enoh, P. I. Anekwe   +10 more
doaj   +1 more source

Polarization of Radiation by the Aerosol-Gas Component of the Atmosphere for Lidar Wavelengths [PDF]

EPJ Web of Conferences, 2020
The report presents an original algorithm for solving the radiation transfer equation based on the Monte Carlo method for problems of atmospheric laser sensing, taking into account the polarization of radiation.
Zimovaya Anna, Konoshonkin Alexander
doaj   +1 more source

Variational scaling law for atmospheric propagation [PDF]

Journal of the Optical Society of America A, 2021
A new scaling law model for propagation of optical beams through atmospheric turbulence is presented and compared to a common scalar stochastic waveoptics technique. This methodology tracks the evolution of the important beam wavefront and phasefront parameters of a propagating Gaussian-shaped laser field as it moves through ...
Sophia, Potoczak Bragdon, Daniel, Cargill, Jacob, Grosek   +2 more
openaire   +2 more sources

Uncertainty Quantification for Infrasound Propagation in the Atmospheric Environment

Applied Sciences, 2022
The propagation of infrasound in the atmosphere is influenced by atmospheric environmental parameters, which affect the precise localization of the infrasound source. Therefore, it has become crucial to quantify the influence of atmospheric environmental
Liang Yu, Xiaoquan Yi, Ran Wang, Chenyu Zhang, Tongdong Wang, Xiaopeng Zhang   +5 more
doaj   +1 more source

Is the Anisotropic Tilt Angle Necessary in the Turbulence Spectrum of Refractive-Index Fluctuations?

Frontiers in Physics, 2022
With the deepening of atmospheric turbulence research, scientists have discovered that the anisotropy of turbulence cells cannot be ignored. The anisotropic non-Kolmogorov turbulence model is more in line with the actual situation of atmospheric ...
Chao Zhai
doaj   +1 more source

Nonlinear forecasts of ƒoF2: variation of model predictive accuracy over time [PDF]

Annales Geophysicae, 2002
Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments
A. H. Y. Chan, A. H. Y. Chan, P. S. Cannon, P. S. Cannon   +3 more
doaj   +1 more source

Laser Beam Atmospheric Propagation Modelling for Aerospace LIDAR Applications

Atmosphere, 2021
Atmospheric effects have a significant impact on the performance of airborne and space laser systems. Traditional models used to predict propagation effects rely heavily on simplified assumptions of the atmospheric properties and their interactions with ...
Thomas Fahey, Maidul Islam, Alessandro Gardi, Roberto Sabatini   +3 more
doaj   +1 more source

Effect of Thermal Blooming on the Higher-Order Mode Fiber Laser Array Propagation Through the Atmosphere

Frontiers in Physics, 2022
The influence of thermal blooming on the propagation properties of higher-order mode (HOM) fiber laser array is studied by using the algorithm for simulating the laser beam propagation in the atmosphere.
Yuqiu Zhang, Tianyue Hou, Yu Deng, Pengfei Ma, Rongtao Su, Pu Zhou   +5 more
doaj   +1 more source

Wind–Temperature Regime and Wind Turbulence in a Stable Boundary Layer of the Atmosphere: Case Study

Remote Sensing, 2020
The paper presents the results of probing the stable atmospheric boundary layer in the coastal zone of Lake Baikal with a coherent Doppler wind lidar and a microwave temperature profiler.
Viktor A. Banakh, Igor N. Smalikho, Andrey V. Falits   +2 more
doaj   +1 more source