Results 61 to 70 of about 227,638 (221)
A new double radio relic in PSZ1 G096.89+24.17 and a radio relic mass-luminosity relation [PDF]
, 2014 Radio relics are diffuse synchrotron sources in galaxy clusters that are believed to trace large-scale shock waves. We have discovered a new double radio relic system in PSZ1 G096.89+24.17 (z=0.3) and have carried out a full-polarization radio observation using the Westerbork Synthesis Radio Telescope (WSRT) at 1.4 GHz.
arxiv +1 more source
IOSR Journal of Electronics and Communication Engineering, 2014 This thesis deals with Radio Wave Propagation in environments where the propagation is severely influenced by surrounding objects, mainly walls and other building structures. As an introduction, a brief description is given on propagation terms like loss, delay and dispersion along with system functions relevant for the topic.
openaire +1 more source
Fossil Radio Plasma in Cluster Merger Shock Waves [PDF]
arXiv, 2001 In several merging clusters of galaxies so-called cluster radio relics have been observed. These are extended radio sources which do not seem to be associated with any radio galaxy. Two competing physical mechanisms to accelerate the radio emitting electrons have been proposed: (i) diffusive shock acceleration and (ii) adiabatic compression of fossil ...
arxiv
Recover of acoustic-gravity wave properties revealed from measurements of VLF radio wave amplitudes [PDF]
arXiv, 2020 A simple method has been proposed to determine acoustic-gravity wave (AGW) properties at mesosphere heights from measurements of VLF radio signals. For relatively short paths (less than $\sim$ 2000 km long), simple relations are obtained for estimation of AGW neutral density fluctuation from measurements of amplitudes of radio signals.
arxiv
Propagation Characteristics of JIY10MHz Waves on the Circuit between Tokyo and Syowa Station
Antarctic Record, 1979 The field strength of the standard frequency waves (JJY) at 10 MHz, measured at Syowa Station in Antarctica, for two years from January 1974 through December 1975 was compared with the value derived from the prediction method which is based on the CCIR ...
Hidetoshi SUGIUCHI +3 more
doaj +1 more source
Relation of daily periods of vlf radiation with X-ray sources
E3S Web of Conferences, 2016 Spectral analysis of electromagnetic noise radiation in the VLF range at three fixed frequencies for the period from 1997 to 2015 have been carried out. Periodograms with diurnal components associated with the periods of the Earth rotation relatively the
Drugin Gennady, Stasiy Ivan
doaj +1 more source
Extended scenarios for solar radio emissions with downshifted electron beam plasma excitations [PDF]
First-principle studies of radiative processes aimed at explaining the origin of type II and type III solar radio bursts raise questions on the implications of downshifted electron beam plasma excitations with frequency (slightly) below the plasma frequency ($\omega\lesssim\omega_{pe}$) in the generation of radio emissions.
arxiv +1 more source
Earth and Planetary PhysicsDuring the course of ionospheric heating experiments, researchers at the European Incoherent Scatter Scientific Association (EISCAT) observed an apparent electron density enhancement.
Jun Wu +7 more
doaj +1 more source
Characteristics of Radio Aurora Occurrences Observed at Syowa Station in Antarctica
Antarctic Record, 1973 Radio aurora occurrences on 112 MHz observed for nearly one year from April 1970 till February 1971 at Syowa Station the Antarctic were analized. Results obtained are summarized as follows: 1) The diurnal variation in the frequency of the radio echo ...
Isao SHIRO, Toshirou SAKAMOTO
doaj +1 more source
Earth, Planets and Space, 2019 Spread-F is known as the electron density inhomogeneous structures in F layer of ionosphere and can usually be classified as frequency spread-F (FSF) and range spread-F (RSF).
Ning Wang +6 more
doaj +1 more source