Mid-latitude ionospheric scintillations of VHF radio signals associated with peculiar fluctuations of Faraday rotation

1978 ◽  
Vol 40 (4) ◽  
pp. 503-506 ◽  
Author(s):  
Kenji Sinno ◽  
Miyao Kan
Keyword(s):  
Faraday Rotation ◽  
Radio Signals ◽  
Ionospheric Scintillations

scholarly journals Comparison of GPS TEC with IRI models of 2007, 2012, AND 1 2016 over Sukkur, Pakistan

2020 ◽  
Vol 1 (1) ◽  
pp. 1-10
Author(s):  
Adil Hussain ◽  
Munawar Shah
Keyword(s):  
Global Positioning System ◽  
Electron Content ◽  
Iri Model ◽  
Low Latitude ◽  
Total Electron ◽  
Gps Tec ◽  
Global Positioning ◽  
Radio Signals ◽  
Ionospheric Scintillations ◽  
Latitude Region

The international reference ionosphere (IRI) models have been widely used for correcting the ionospheric scintillations at different altitude levels. An evaluation on the performance of VTEC correction from IRI models (version 2007, 2012 and 2016) over Sukkur, Pakistan (27.71º N, 68.85º E) is presented in this work. Total Electron Content (TEC) from IRI models and GPS in 2019 over Sukkur region are compared. The main aim of this comparative analysis is to improve the VTEC in low latitude Sukkur, Pakistan. Moreover, this study will also help us to identify the credible IRI model for the correction of Global Positioning System (GPS) signal in low latitude region in future. The development of more accurate TEC finds useful applications in enhancing the extent to which ionospheric influences on radio signals are corrected. VTEC from GPS and IRI models are collected between May 1, 2019 and May 3, 2019. Additionally, Dst and Kp data are also compared in this work to estimate the geomagnetic storm variations. This study shows a good correlation of 0.83 between VTEC of GPS and IRI 2016. Furthermore, a correlation of 0.82 and 0.78 is also recorded for IRI 2012 and IRI 2007 respectively, with VTEC of GPS. The IRI TEC predictions and GPS-TEC measurements for the studied days reveal the potential of IRI model as a good candidate over Pakistan.

High latitude ionospheric scintillations

1984 ◽  
Vol 62 (5) ◽  
pp. 487-504 ◽  
Author(s):  
J. A. Fulford ◽  
P. A. Forsyth
Keyword(s):  
Statistical Parameter ◽  
Spectral Density Function ◽  
Statistical Characteristics ◽  
Angle Of Arrival ◽  
Statistical Parameters ◽  
Application Systems ◽  
Power Spectral ◽  
Radio Signals ◽  
Ionospheric Scintillations

The statistical characteristics of ionospheric irregularities are often described by specifying one or two of the statistical parameters of the scintillations that the irregularities produce in satellite radio signals. The most commonly used parameter for this purpose is the spectral index (slope of the power spectral density function on a log–log plot). While it is becoming increasingly clear that the characterization of either phase or amplitude scintillations by a single parameter may obscure significant characteristics of the scintillations, this simple approach has proven to be useful for the prediction of the behaviour of transionospheric propagation paths such as those used in various space application systems. This paper explores the use, in addition to the usual phase and amplitude observations, of measurements of angle-of-arrival, in order to characterize the scintillations. Since each of these observations represent a different kind of observational "filtering", the combination of one statistical parameter from each type of measurement should provide a more adequate characterization of the scintillations. It is found that the use of the widths of the autocorrelation functions for this purpose is preferred over the use of spectral indices.

scholarly journals Faraday rotation fluctuations of MESSENGER radio signals through the equatorial lower corona near solar minimum

Space Weather ◽  
2017 ◽  
Vol 15 (2) ◽  
pp. 310-324 ◽  
Author(s):  
D. B. Wexler ◽  
E. A. Jensen ◽  
J. V. Hollweg ◽  
C. Heiles ◽  
A. I. Efimov ◽  
...  
Keyword(s):  
Faraday Rotation ◽  
Solar Minimum ◽  
Lower Corona ◽  
Radio Signals

scholarly journals Pulsars and the ISM

2002 ◽  
Vol 199 ◽  
pp. 363-368
Author(s):  
Yashwant Gupta
Keyword(s):  
Interstellar Medium ◽  
Electron Density ◽  
Faraday Rotation ◽  
Density Fluctuations ◽  
Pulsar Emission ◽  
Main Emphasis ◽  
Propagation Effects ◽  
Recent Developments ◽  
Radio Signals ◽  
Electron Density Fluctuations

Radio signals from pulsars are significantly affected by propagation effects such as dispersion, faraday rotation and scintillations in the interstellar medium (ISM). In this paper, I review some aspects of our understanding about pulsars and interstellar scintillations (ISS). The study of pulsar scintillation has dual benefits in that it allows us to learn about the properties of the ISM using pulsars as probes, as well as to infer some properties about pulsars, using the ISM as a tool. Both these aspects are addressed in this paper. The main emphasis is on recent developments in the following topics : (i) the shape of the spectrum of electron density fluctuations in the interstellar medium (ii) the distribution of scattering plasma in the local ISM and (iii) resolving pulsar emission regions using ISS.

scholarly journals A Radio Polarimeter-Spectrometer

1983 ◽  
Vol 5 (2) ◽  
pp. 260-262 ◽  
Author(s):  
P.J. Hall ◽  
P.A. Hamilton ◽  
P.M. McCulloch
Keyword(s):  
Frequency Dependence ◽  
Faraday Rotation ◽  
Major Part ◽  
Stokes Parameter ◽  
Radio Signals ◽  
Polarization Characteristics ◽  
Polarization Behaviour ◽  
Spectrometer Data

The polarization characteristics of celestial radio signals are a major part of the observable nature of the radiation. Stokes polarimeters, instruments for measuring the complete polarization properties of radiation, are usually narrowband devices in order to minimise depolarization effects originating in the source or in the medium through which the radiation propagates. To measure the broadband polarization behaviour of a source, a Stokes polarimeter-spectrometer is required. Such an instrument allows the frequency dependence of each Stokes parameter to be deduced, making it possible to apply corrections to each parameter to account for known forms of polarization distortion (e.g. Faraday rotation). It is also possible to remove delay distortion from impulsive sources such as pulsars by processing the spectrometer data according to the usual de-dispersion algorithms. In some studies observation of distortion phenomena may be the major aim and a polarimeter spectrometer greatly facilitates measurements of these effects.

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