Results 21 to 30 of about 126,100 (317)
Inhomogeneous structure of the high-latitude ionosphere as observed at Norilsk [PDF]
, 2001 In March and August/September 1995, February 1996, and in March-April 1998, observations of the inhomogeneous structure of the high-latitude ionosphere were carried out at Norilsk (geomagnetic latitude and longitude are 64.2 N and 160.4 E, and L=5.2 ...
Lipko, Yu. V.
core +4 more sources
The STM32 microcontroller based pulse intensity registration system for the neutron monitor
EPJ Web of Conferences, 2017 We present the outlines of a new microcontroller based data acquisition system which is aimed for reliable operation in a typical cosmic ray particle registration experiment.
Shepetov Alexander +5 more
doaj +2 more sources
Methods and Algorithms of Subsurface Holographic Sounding
Remote Sensing, 2022 In our experiments, we develop and test portable multi-element receiver antenna arrays, electrically scanned in order to immediately obtain a recognizable image of subsurface objects.
A. V. Popov +5 more
doaj +1 more source
An ionospheric index suitable for estimating the degree of ionospheric perturbations [PDF]
Journal of Space Weather and Space Climate, 2018 Space weather can strongly affect trans-ionospheric radio signals depending on the used frequency. In order to assess the strength of a space weather event from its origin at the sun towards its impact on the ionosphere a number of physical quantities need to be derived from scientific measurements.
Wilken, Volker +3 more
openaire +3 more sources
Quantifying Ionospheric Effects on Global 21-cm Observations [PDF]
, 2020 We modelled the two major layer of Earth's ionosphere, the F-layer and the D-layer, by a simplified spatial model with temporal variance to study the chromatic ionospheric effects on global 21-cm observations. From the analyses, we found that the magnitude of the ionospheric disruptions due to ionospheric refraction and absorption can be greater than ...
arxiv +1 more source
Bayesian Data Analysis for Sky-averaged 21-cm Experiments in the Presence of Ionospheric Effects [PDF]
, 2022 The ionosphere introduces chromatic distortions on low frequency radio waves, and thus poses a hurdle for 21-cm cosmology. In this paper we introduce time-varying chromatic ionospheric effects on simulated antenna temperature data of a global 21-cm data analysis pipeline, and try to detect the injected global signal. We demonstrate that given turbulent
arxiv +1 more source
Exploring Earth's Ionosphere and its effect on low radio frequency observation with the uGMRT and the SKA [PDF]
Journal of Astrophysics and Astronomy (2023), 2022 The Earth's ionosphere introduces systematic effects that limit the performance of a radio interferometer at low frequencies ($\lesssim 1$\,GHz). These effects become more pronounced for severe geomagnetic activities or observations involving longer baselines of the interferometer.
arxiv +1 more source
Ionosphere/Plasmasphere sounding with ground and space-based GNSS observations [PDF]
, 2016 Applying a methodology developed and tested in previous studies, the contribution from the ionospheric and plasmaspheric regions to the total electron content (measured by ground receivers) is analyzed.
González Casado, Guillermo +3 more
core +1 more source
Deformation of Ionospheric Potential Pattern by Ionospheric Hall Polarization [PDF]
Journal of Geophysical Research: Space Physics, 2019 AbstractThe present study shows that the ionospheric Hall polarization can deform the high‐latitude ionospheric convection field, which is widely considered to be a manifestation of the convection field in the magnetosphere. We perform the Hall polarization field separation with a potential solver by changing the conductance distribution step by step ...
Aoi, Nakamizo, Akimasa, Yoshikawa
openaire +2 more sources
Airborne Ground Penetrating Radar, Field Test
Remote Sensing, 2021 Deployment of a ground penetrating radar (GPR) on a flying machine allows one to substantially extend the application area of this geophysical method and to simplify carrying out large surveys of dangerous and hard-to-reach terrain, where usual ground ...
Dmitry Edemsky +3 more
doaj +1 more source