Results 41 to 50 of about 227,638 (221)
E3S Web of Conferences, 2016 To investigate high frequency geoacoustic emission, a receiving system based on a compound vector receiver was installed in Kamchatka. It allows the authors to determine the direction of sound wave arrival.
Marapulets Yuriy +2 more
doaj +1 more source
Radio-Wave Propagation and Electromagnetic Surface Waves [PDF]
Proceedings of the National Academy of Sciences, 1947 A Discrepancy and Its Resolution. - The problem of the propagation of radio-waves along the surface of the (plane) earth was first treated in a celebrated paper by A. Sommerfeld (1909).(1) Let the (r, φ)-plane of a cylindric system of coordinates coincide with the plane of the earth surface and let the z-axis point vertically upward.
openaire +4 more sources
RadioNet: Transformer based Radio Map Prediction Model For Dense Urban Environments [PDF]
arXiv, 2021 Radio Map Prediction (RMP), aiming at estimating coverage of radio wave, has been widely recognized as an enabling technology for improving radio spectrum efficiency. However, fast and reliable radio map prediction can be very challenging due to the complicated interaction between radio waves and the environment.
arxiv
Radio signature of cosmological structure formation shocks [PDF]
Mon.Not.Roy.Astron.Soc.375:77-91,2007, 2006 In the course of the formation of cosmological structures, large shock waves are generated in the intra-cluster medium. In analogy to processes in supernova remnants, these shock waves may generate a significant population of relativistic electrons which, in turn, produce observable synchrotron emission. The extended radio relics found at the periphery
arxiv +1 more source
Lidar diagnostics of ionosphere precipitations
E3S Web of Conferences, 2018 Lidar is considered as an electron energy detector of ionosphere precipitations, and the cleaning of radiation belts is like the energy pumping of the ionosphere layer.
Shevtsov Boris +2 more
doaj +1 more source
Diagnostics of geomagnetically-induced currents in high-tension electric transmission lines [PDF]
E3S Web of Conferences, 2019 The problem of geomagnetically-induced currents (GIC) effect on electrotechnical systems is topical as long as uninterrupted power distribution is critically important for all the spheres of human activity.
Sivokon Vladimir +2 more
doaj +1 more source
The polarisation of radio waves [PDF]
Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character, 1928 The following paper is primarily an attempt to study by experimental methods the problem of the propagation of long radio waves between two points on the surface of the earth. In the early days of radio-telegraphy the propagation formulæ in general use were admittedly empirical; being derived from the simple expressions for propagation over a plane ...
openaire +2 more sources
Ionosphere disturbance during cosmodrome “Vostochniy” launches
E3S Web of Conferences, 2018 It is known that during spacecraft launches ionospheric plasma properties are modified in the result of impact of shock-acoustic waves generated during carrier rocket supersonic motion. As a rule, investigation of ionospheric plasma variations is carried
Dumbrava Zinaida F. +3 more
doaj +1 more source
Recurrent and sporadic Forbush decreases during solar cycles 23–24
Solar-Terrestrial Physics, 2019 A comparison has been made between recurrent (associated with high-speed streams from coronal holes) and sporadic (caused by interplanetary coronal mass ejections (ICMEs)) Forbush decreases (FDs) in solar cycles 23 and 24 (as well as in the maxima of ...
Melkumyan A.A. +6 more
doaj +1 more source
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