Morphology Of Ionospheric Scintillation
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Global Morphology Of Ionospheric Scintillations Ii
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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.
Global Morphology Of Ionospheric Scintillations
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Author : Jules Aarons
language : en
Publisher:
Release Date : 1970
Global Morphology 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 1970 with Geostationary satellites categories.
Amplitude fluctuations produced by small irregularities in electron density in the F-layer of the ionosphere (at 300 to 400 km height) can be a problem to communication and navigation systems in the VHF-UHF range. Recent measurements, primarily by AFCRL, are shown with emphasis on results at high and equatorial latitudes. At high latitudes an irregularity region exists whose lower boundary reaches 57 degrees invariant latitude near midnight. During magnetic storms the boundary descends to lower latitudes and the fading becomes deeper. Over the polar cap scintillations are somewhat diminished. When observing synchronous satellites through the irregularity region, deep and fast fading is frequently seen, with fade rates to one per second. Irregularities produce deep scintillations in the VHF range plus or minus 15 degrees from the geomagnetic equator. In equatorial regions maximum occurrence of high level scintillations takes place between 2100 and 2400 local time during the equinoxes; a minimum occurrence is observed during the solstices. When the sunspot number decreases, the equatorial irregularity region spreads and becomes larger. The data for various latitudes has been placed in statistical form, that is, distribution of amplitudes for 15-min samples as well as for periods of 1 yr and longer. (Author).
Global Morphology Of Ionospheric Scintillations
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Author : Jules Aarons
language : en
Publisher:
Release Date : 1970
Global Morphology 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 1970 with Geostationary satellites categories.
Amplitude fluctuations produced by small irregularities in electron density in the F-layer of the ionosphere (at 300 to 400 km height) can be a problem to communication and navigation systems in the VHF-UHF range. Recent measurements, primarily by AFCRL, are shown with emphasis on results at high and equatorial latitudes. At high latitudes an irregularity region exists whose lower boundary reaches 57 degrees invariant latitude near midnight. During magnetic storms the boundary descends to lower latitudes and the fading becomes deeper. Over the polar cap scintillations are somewhat diminished. When observing synchronous satellites through the irregularity region, deep and fast fading is frequently seen, with fade rates to one per second. Irregularities produce deep scintillations in the VHF range plus or minus 15 degrees from the geomagnetic equator. In equatorial regions maximum occurrence of high level scintillations takes place between 2100 and 2400 local time during the equinoxes; a minimum occurrence is observed during the solstices. When the sunspot number decreases, the equatorial irregularity region spreads and becomes larger. The data for various latitudes has been placed in statistical form, that is, distribution of amplitudes for 15-min samples as well as for periods of 1 yr and longer. (Author)
Morphology Of Ionospheric Scintillation
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Author : Robert K. Crane
language : en
Publisher:
Release Date : 1974
Morphology Of Ionospheric Scintillation written by Robert K. Crane and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Ionospheric radio wave propagation categories.
The report is directed toward providing information to communication systems designers first about scintillation as observed in a single experiment, second about the adequacy of the existing models used to interpret scintillation data, and finally about the variation of scintillation with geophysical parameters.
Global Morphology Of Ionospheric Scintillations Ii
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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.
Global Morphology Of Ionospheric Scintillations 2
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Author : UNITED STATES. DEPARTMENT OF THE AIR FORCE. AIR FORCE SYSTEMS COMMAND. AIR FORCE CAMBRIDGE RESEARCH LABORATORIES.
language : en
Publisher:
Release Date : 1975
Global Morphology Of Ionospheric Scintillations 2 written by UNITED STATES. DEPARTMENT OF THE AIR FORCE. AIR FORCE SYSTEMS COMMAND. AIR FORCE CAMBRIDGE RESEARCH LABORATORIES. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with categories.
Ionospheric Scintillation Effects On Vhf Uhf Communication Systems
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Author : H. E. Whitney
language : en
Publisher:
Release Date : 1976
Ionospheric Scintillation Effects On Vhf Uhf Communication Systems 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 1976 with Artificial satellites categories.
Ionospheric Scintillations Tec And In Situ Density Measurements At An Auroral Location In The European Sector
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Author : Eileen MacKenzie
language : en
Publisher:
Release Date : 1987
Ionospheric Scintillations Tec And In Situ Density Measurements At An Auroral Location In The European Sector written by Eileen MacKenzie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Auroras categories.
The orbiting HiLat satellite launched in 1983 offered an opportunity for studying ionospheric scintillation parameters in relation to in-situ measurements of ionization density, drift velocity, field-aligned current, and particle precipitation during the sunspot minimum period. This report discusses results of a morphological study based on observations of scintillations and total electron content (TEC) at the auroral oval station at Tromso, Norway, during the period Dec 1983 - Oct 1985. The geometrical enhancement of scintillations observed during alignment of the propagation with the local magnetic L-shell is shown to be the most consistent and conspicuous feature of scintillations in the nighttime auroral oval. The dynamics of the spatial and temporal extent of this region are illustrated in the invariant latitude/magnetic local time grid. Steepening of phase spectral slope in the geometrical enhancement region is indicative of the presence of L-shell aligned sheet-like irregularities at long scale lengths. The seasonal variation of TEC determined from the differential Doppler measurements of HiLat transmissions is discussed in relation to the in-situ density measurements at 830 km. The results are also used to illustrate the dependence of ionospheric structure parameters on short-term variability of solar activity during the sunspot minimum period. This study provides an insight into the nature of magnetospheric coupling with the ionosphere at high latitudes.
Ionospheric Scintillation Modeling Needs And Tricks
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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.
Model Of Equatorial Scintillations From In Situ Measurements
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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).