Ionospheric Scintillation Modeling Needs And Tricks
DOWNLOAD
Download Ionospheric Scintillation Modeling Needs And Tricks PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Ionospheric Scintillation Modeling Needs And Tricks book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Ionospheric Scintillation Modeling Needs And Tricks
DOWNLOAD
Author : Shishir Priyadarshi
language : en
Publisher:
Release Date : 2022
Ionospheric Scintillation Modeling Needs And Tricks written by Shishir Priyadarshi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Electronic books categories.
The wavelength of the radio-wave satellite signal is of the order of the minimal small-scale ionospheric irregularities (i.e., a few centimeters). As the satellite signal passes through the ionosphere, its interaction with the ionospheric irregularity structures causes refraction, reflection, and polarization in the satellite signal. Ionospheric irregularities degrade the trans-ionospheric radio-wave signal quality, between the satellite and the receivers, due to scintillation. The physics-based model often fails to produce global morphology during the extreme solar events, whereas empirical models based on the ionospheric scintillation data demonstrate better quality to forecast the scintillation effects during extreme solar event. It is really tricky to make a scintillation model that is sensitive to low and high solar activities as well as extreme solar events simultaneously. In the presented book chapter, we will discuss/review the needs and tricks of modeling ionospheric scintillation during extreme solar events as well as all weather and latitudinal cases. There are several aspects that influence the scintillation occurrence, its strength, and global distribution. The latitudinal dependence, local weather, solar/geomagnetic activity conditions, and local times are the widely accepted factors that control and influence ionospheric scintillation most. This book chapter discusses all these aspects and also suggests the ways to cast aside those factors that led to the wrong measure of scintillation indices.
High Latitude Models Observations And Analysis Of Ionospheric Scintillations
DOWNLOAD
Author : Jules Aarons
language : en
Publisher:
Release Date : 1973
High Latitude Models Observations And Analysis Of Ionospheric Scintillations written by Jules Aarons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Ionosphere categories.
In order to provide systems engineers with observations and analysis of the amplitude-fading of radio waves traversing the high latitude ionosphere, several different studies were performed. The concept was to develop descriptive and statistical models for the pattern of occurrence and amplitude of scintillations at high latitudes. Then, long terms observations from a limited number of sites could be linked to allow an assessment of the scintillation problem to communication, navigation, and detection systems in the VHF and UHF bands. This report discusses these studies in three chapters. In Chapter 1, general patterns of scintillation occurrence and intensity are presented in the descriptive model of the F-layer irregularities at high latitudes. This is followed in Chapter 2 by a graphical presentation of the data; that is, observations of the 136 MHz beacon of ATS-3. Chapter 3 organizes the observations into a useful format-the cumulative amplitude probability distribution function-for the engineer. A means of adjusting the observations for frequency dependence is provided.
Satellites Missions And Technologies For Geosciences
DOWNLOAD
Author : Vladislav Demyanov
language : en
Publisher: BoD – Books on Demand
Release Date : 2020-07-22
Satellites Missions And Technologies For Geosciences written by Vladislav Demyanov and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-07-22 with Science categories.
Being a vital modern technology, satellite systems for navigation, telecommunication, and geosciences have developed rapidly in the last 25 years. Modern satellite technologies have become a base of our civilization and support our day-to-day activity in both practice and geosciences. This book is devoted to GNSS-remote sensing for ionosphere research, modeling and mitigation techniques to diminish the ionosphere and multipath impacts on GNSS, and survey of the modern satellite missions and technologies. We hope that the experts’ opinions presented in the book will be interesting for the research community and students in the area of satellites and space missions as well as in engineering and geoscience research.
An Investigation Of Methods For Updating Ionospheric Scintillation Models Using Topside In Situ Plasma Density Measurements
DOWNLOAD
Author : James A. Secan
language : en
Publisher:
Release Date : 1993
An Investigation Of Methods For Updating Ionospheric Scintillation Models Using Topside In Situ Plasma Density Measurements written by James A. Secan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Ionospheric radio wave propagation categories.
Global Morphology Of Ionospheric Scintillations Ii
DOWNLOAD
Author : Jules Aarons
language : en
Publisher:
Release Date : 1975
Global Morphology Of Ionospheric Scintillations Ii written by Jules Aarons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with F region categories.
Updating a review of the global morphology of ionospheric scintillations published in 1971, this study adds additional experimental studies on familiar topics to newer types of measurements of ionospheric irregularities, including in situ experiments and artificial heating of the F-layer.
Model Of Equatorial Scintillations From In Situ Measurements
DOWNLOAD
Author : Sunanda Basu
language : en
Publisher:
Release Date : 1976
Model Of Equatorial Scintillations From In Situ Measurements written by Sunanda Basu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with F region categories.
In situ measurements of F-region irregularity amplitude and ambient electron density made by the retarding potential analyzer (RPA) on OGO-6 near perigee altitude of 400 km have been utilized to derive the variation of electron density deviation over the equatorial region. Based on these measured electron density deviations and other assumed model parameters, including a three-dimensional power-law form of irregularity spectrum of index 4, a model of equatorial scintillations is developed in the framework of diffraction theory. The percentage occurrence contours of estimated equatorial scintillations greater than or equal to 4.5 dB at 140 MHz during 1900 to 2300 LMT for the period November to December 1969 and 1970 have been derived. The model is found to depict a pronounced longitude variation with the scintillation belt width and percentage occurrence being maximum over the African sector. The latitude extent of the spatial scintillation belt narrows over the American sector without much decrease in the scintillation occurrence whereas over the Indian and Far Eastern sectors both the extent and the occurrence are found to decrease. The percentage occurrence of scintillations estimated from this model is found to be consistent with VHF scintillation measurements at Ghana, Huancayo, and Calcutta. In addition, the model was found to be in qualitative agreement with GHz observations at various longitudes made by the COMSAT group. The effect of varying model parameters on scintillation estimates at VHF, UHF and GHz are discussed. Implications of the observed longitudinal variation of scintillations on current theories of equatorial irregularity formation are indicated. (Author).
Ionospheric Scintillation Predictions For Goes
DOWNLOAD
Author : Joseph Horace Pope
language : en
Publisher:
Release Date : 1973
Ionospheric Scintillation Predictions For Goes written by Joseph Horace Pope and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Ionosphere categories.
A world-wide model of ionospheric irregularities giving rise to scintillations was developed by Fremouw and Rino of Stanford Research Institute. This model takes into consideration diurnal, seasonal, and solar variations. Also considered is the dependence on geomagnetic latitude, frequency, and the geometry between the transmitter and the receiver. This model was used to make computations appropriate for the GOES system, assuming the satellite to be parked on 100°W longitude. Calculations were made at 400 MHz for sunspot numbers 30, 100, and 200, coo responding to low, medium, and high solar activity; for solstice and equinoctial periods; and for several times of the day. The results are presented as contour maps of the earth as viewed from GOES. The results show that for low solar activity periods serious scintillations will occur only within about ± 10 degrees of the geomagnetic equator. During moderately active periods stations located in the vicinity of the auroral zones will also be affected. The worst case condition occurs for sunspot number 200, during the equinox, and at midnight , on the longitude of the geostationary satellite. In general, the mid-latitude regions are relatively free from scintillations. These results should be useful in determining the positioning and programming of the data readout of the numerous surface-based stations to be used in connection with the data collection and relay subsystem.
An Investigation Of Methods For Updating Ionospheric Scintillation Models Using Topside In Situ Plasma Density Measurements
DOWNLOAD
Author : James A. Secan
language : en
Publisher:
Release Date : 1993
An Investigation Of Methods For Updating Ionospheric Scintillation Models Using Topside In Situ Plasma Density Measurements written by James A. Secan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Ionospheric radio wave propagation categories.
High Latitude Models Observations And Analysis Of Ionospheric Scintillations
DOWNLOAD
Author : Jules Aarons
language : en
Publisher:
Release Date : 1973
High Latitude Models Observations And Analysis Of Ionospheric Scintillations written by Jules Aarons and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Ionosphere categories.
In order to provide systems engineers with observations and analysis of the amplitude-fading of radio waves traversing the high latitude ionosphere, several different studies were performed. The concept was to develop descriptive and statistical models for the pattern of occurrence and amplitude of scintillations at high latitudes. Then, long terms observations from a limited number of sites could be linked to allow an assessment of the scintillation problem to communication, navigation, and detection systems in the VHF and UHF bands. This report discusses these studies in three chapters. In Chapter 1, general patterns of scintillation occurrence and intensity are presented in the descriptive model of the F-layer irregularities at high latitudes. This is followed in Chapter 2 by a graphical presentation of the data; that is, observations of the 136 MHz beacon of ATS-3. Chapter 3 organizes the observations into a useful format-the cumulative amplitude probability distribution function-for the engineer. A means of adjusting the observations for frequency dependence is provided.
A Proposed Index For Measuring Ionospheric Scintillation
DOWNLOAD
Author : H. E. Whitney
language : en
Publisher:
Release Date : 1968
A Proposed Index For Measuring Ionospheric Scintillation written by H. E. Whitney and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with Artificial satellites categories.
Signals from radio star sources and satellites are regularly used for studying ionospheric irregularities. Amplitude and phase deviations can be imposed on the signals from these sources as they traverse the ionosphere. A parameter frequently used to describe the magnitude of this scintillation effect is scintillation index. An experiment was designed to correlate various methods of making scintillation measurements; observations were made at 40 MHz using the ionospheric beacon, S-66. It is shown that when the law of the receiver detector is known, a conversion method allows comparison of data and statistics on scintillation index. A simplified method of scaling scintillation index is described. The accuracy of the simplified method is determined by a comparison with measurements of scintillation index by machine computation.