An Empirical Model of the Polar Ionosphere PDF Download
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Author: Terence James Elkins
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 158
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Book Description
Four separate articles are collected which deal with the construction of empirical models of the polar ionosphere. The particular emphasis in these articles is towards the radio propagation application of the models. Numerical models of the vertical electron density profiles on the topside and bottomside of the F-region are developed, and a model for sporadic-E is included. Special attention is devoted to features which are characteristic of the polar ionosphere-auroral effects, the trough, and magnetospheric cleft regions. The models are constructed specifically for convenience in computer programming, and in fact, all aspects of the models contained in this report are available in the form of Fortran computer programs. (Author).
Author: Terence James Elkins
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 158
Get Book Here
Book Description
Four separate articles are collected which deal with the construction of empirical models of the polar ionosphere. The particular emphasis in these articles is towards the radio propagation application of the models. Numerical models of the vertical electron density profiles on the topside and bottomside of the F-region are developed, and a model for sporadic-E is included. Special attention is devoted to features which are characteristic of the polar ionosphere-auroral effects, the trough, and magnetospheric cleft regions. The models are constructed specifically for convenience in computer programming, and in fact, all aspects of the models contained in this report are available in the form of Fortran computer programs. (Author).
Author: Terence James Elkins
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 0
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Book Description
Four separate articles are collected which deal with the construction of empirical models of the polar ionosphere. The particular emphasis in these articles is towards the radio propagation application of the models. Numerical models of the vertical electron density profiles on the topside and bottomside of the F-region are developed, and a model for sporadic-E is included. Special attention is devoted to features which are characteristic of the polar ionosphere-auroral effects, the trough, and magnetospheric cleft regions. The models are constructed specifically for convenience in computer programming, and in fact, all aspects of the models contained in this report are available in the form of Fortran computer programs. (Author)
Author: Jeffrey M. Forbes
Publisher:
ISBN:
Category : F region
Languages : en
Pages : 60
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Book Description
Author: Racheal Athieno
Publisher:
ISBN:
Category : Ionosphere
Languages : en
Pages : 149
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Book Description
The use of high frequency (HF) communication at high latitudes still forms the backbone of many systems, owing to the fact that there are few alternatives to HF radio for the merchant and fishing fleets, military forces (land, sea and air) and for the civil aviation industry for these latitudes. HF communication uses the ionosphere as a medium of propagation, but its variable nature can be a disadvantage to both the radio operators and users. The choice of a suitable usable frequency is thus dependent on the ability to predict the conditions of the ionosphere. Thus, HF propagation predictions can be inferred from the predicted conditions of the ionosphere. In fact, in most cases, the predictions of ionospheric conditions and HF propagation are often assumed to be identical. Hence, the need to develop ionospheric model(s) suitable for high latitudes to enable a relatively smooth operation of ionospheric-dependent radio communication. Most of the available models, particularly the empirical ones were developed with little data at high latitudes. Data availability has improved over the years due to technological advancement and continued research. For instance, the Canadian High Arctic Ionospheric Network (CHAIN) provides a wealth of data for the polar and auroral regions. Using CHAIN data, the performance of the Voice of America Coverage Analysis Program (VOACAP), Ionospheric Communication Enhanced Profile Analysis and Circuit (ICEPAC) and the recommendation 533 (REC533) propagation models was evaluated and some inconsistences were identified for each of the models. An additional study of ionospheric variability in the arctic region revealed that the currently available International Telecommunication Union Recommendation (ITU-R) variability factors demonstrate notable differences from observations during the winter and equinoxes. A model for the critical frequency of the F2 layer was developed using both CHAIN and Space Physics Interactive Data Resource (SPIDR) data. The model results show an improvement compared to the available baseline International Reference Ionosphere (IRI) model.
Author: Jeffrey M. Forbes
Publisher:
ISBN:
Category : F region
Languages : en
Pages : 58
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Book Description
An improved analytic/empirical model of F-layer plasma density is developed by modifying the Chiu (1975) model so as to: (a) better approximate middle latitude F-layer peak heights (hmF2's) as derived from ionosonde data, and (b) better model features such as the post-sunset rise in the F-layer peak height, and the equatorial anomaly maxima in plasma density near + or - 15 geomagnetic latitude. The latter is accomplished by applying analytic low-latitude correction as derived from differences between the Chiu model and the SLIM model of Anderson et al. Results of a numerical model are also presented that demonstrate the importance of these low-latitude plasma structures tot he neutral dynamics of the thermosphere.
Author: Jeffrey M. Forbes
Publisher:
ISBN:
Category : F region
Languages : en
Pages : 48
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Book Description
Author: KORENKOV
Publisher: Birkhäuser
ISBN: 3034865325
Category : Science
Languages : en
Pages : 373
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Book Description
Author: Jeffrey M. Forbes
Publisher:
ISBN:
Category : F region
Languages : en
Pages : 0
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Book Description
An improved analytic/empirical model of F-layer plasma density is developed by modifying the Chiu (1975) model so as to: (a) better approximate middle latitude F-layer peak heights (hmF2's) as derived from ionosonde data, and (b) better model features such as the post-sunset rise in the F-layer peak height, and the equatorial anomaly maxima in plasma density near + or - 15 geomagnetic latitude. The latter is accomplished by applying analytic low-latitude correction as derived from differences between the Chiu model and the SLIM model of Anderson et al. Results of a numerical model are also presented that demonstrate the importance of these low-latitude plasma structures tot he neutral dynamics of the thermosphere.
Author: J. D. Huba
Publisher: John Wiley & Sons
ISBN: 1118704452
Category : Science
Languages : en
Pages : 735
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Book Description
Published by the American Geophysical Union as part of the Geophysical Monograph Series, Volume 201. Modeling the Ionosphere-Thermosphere System brings together for the first time a detailed description of the physics of the IT system in conjunction with numerical techniques to solve the complex system of equations that describe the system, as well as issues of current interest. Volume highlights include discussions of: Physics of the ionosphere and thermosphere IT system, and the numerical methods to solve the basic equations of the IT system The physics and numerical methods to determine the global electrodynamics of the IT system The response of the IT system to forcings from below (i.e., the lower atmosphere) and from above (i.e., the magnetosphere) The physics and numerical methods to model ionospheric irregularities Data assimilation techniques, comparison of model results to data, climate variability studies, and applications to space weather Providing a clear description of the physics of this system in several tutorial-like articles, Modeling the Ionosphere-Thermosphere System is of value to the upper atmosphere science community in general. Chapters describing details of the numerical methods used to solve the equations that describe the IT system make the volume useful to both active researchers in the field and students.
Author: William J. Burke
Publisher:
ISBN:
Category : Atmospheric models
Languages : en
Pages : 80
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Book Description
This report provides an introductory overview of electrodynamic interactions between the magnetosphere and ionosphere. In the first half of the paper, the viscous interaction and magnetic merging models for driving convection are described. The notion of adiabatic heating as a natural consequence of convection is introduced, in conjunction with a quasi-empirical model for the magnetospheric potential. The second half of the paper concerns observations of electrodynamic quantities taken in the topside ionosphere in the polar cap and auroral oval.
