Study of Equatorial Ionospheric Irregularities Using Space Tethered,multi-point Technique and Coordinated Ground-based FPI and Scintillation Measurements PDF Download

Author: Rohini Sarpeshkar Indiresan
Publisher:
ISBN:
Category :
Languages : en
Pages : 668

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Author: Ankur Nauso Kepkar
Publisher:
ISBN:
Category :
Languages : en
Pages : 0

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Author: Jules Aarons
Publisher:
ISBN:
Category : F region
Languages : en
Pages : 30

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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.

Author: Timothy Fuller-Rowell
Publisher: John Wiley & Sons
ISBN: 1118929233
Category : Science
Languages : en
Pages : 741

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This monograph is the outcome of an American Geophysical Union Chapman Conference on longitude and hemispheric dependence of ionospheric space weather, including the impact of waves propagating from the lower atmosphere. The Chapman Conference was held in Africa as a means of focusing attention on an extensive geographic region where observations are critically needed to address some of the fundamental questions of the physical processes driving the ionosphere locally and globally. The compilation of papers from the conference describes the physics of this system and the mechanisms that control ionospheric space weather in a combination of tutorial-like and focused articles that will be of value to the upper atmosphere scientific community in general and to ongoing global magnetosphere-ionosphere-thermosphere (MIT) modeling efforts in particular. A number of articles from each science theme describe details of the physics behind each phenomenon that help to solve the complexity of the MIT system. Because this volume is an outcome of the research presented at this first space science Chapman Conference held in Africa, it has further provided an opportunity for African scientists to communicate their research results with the international community. In addition, the meeting and this conference volume will greatly enhance the space science education and research interest in the African continent and around the world. Ionospheric Space Weather includes articles from six science themes that were discussed at the Chapman Conference in 2012. These include: Hemispherical dependence of magnetospheric energy injection and the thermosphere-ionosphere response Longitude and hemispheric dependence of storm-enhanced densities (SED) Response of the thermosphere and ionosphere to variability in solar radiation Longitude spatial structure in total electron content and electrodynamics Temporal response to lower-atmosphere disturbances Ionospheric irregularities and scintillation Ionospheric Space Weather: Longitude Dependence and Lower Atmosphere Forcing will be useful to both active researchers and advanced graduate students in the field of physics, geophysics, and engineering, especially those who are keen to acquire a global understanding of ionospheric phenomena, including observational information from all longitude sectors across the globe.

Author: Viacheslav E. Kunitsyn
Publisher: Springer Science & Business Media
ISBN: 3662052210
Category : Science
Languages : en
Pages : 263

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Authored by leading international researchers, this monograph introduces and reviews developed tomograhic methods for discovering 2D and 3D structures of the ionosphere, and discusses the experimental implementation of these methods. The detailed derivations and explanations make this book an excellent starting point for non-specialists.

Author: Eileen MacKenzie
Publisher:
ISBN:
Category : Auroras
Languages : en
Pages : 52

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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.

Author: Sunanda Basu
Publisher:
ISBN:
Category : F region
Languages : en
Pages : 31

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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)

Author: A. Giraud
Publisher: Springer Science & Business Media
ISBN: 9789027704993
Category : Science
Languages : en
Pages : 306

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If our eyes were radio rather than optical wide-band detectors it is well known that for us the brightest object in the sky would still be the Sun; that planets, stars and the Milky Way would still shine feebly (and that we would still occasionally be blinded by man-made sources). What is less well known is that quite a different earthbound overcast would hover about us, with its climatic zones, its seasonal changes, its unpredictable storms and scintillating transparence. To be sure, we can get a sort of glimpse of this peculiar type of weather when we tune our receiver to radio broad casting from some remote spot, or photograph the Earth from space at certain specific wavelengths. Nevertheless no one has ever looked at the ionized shroud of the Earth without the help of sophisticated apparatus, and this is one of the reasons why in this domain the phenomena are not easily abstracted from the use of specific techniques. For generations, the study of the ionosphere has been deeply interwoven with the practice of radio communication and detection. Today however, ionospheric physics is best thought of as a branch of space physics; that part of physics which deals with processes at work in the solar system and methods developed for its exploration.

Author: Santimay Basu
Publisher:
ISBN:
Category : Backscattering
Languages : en
Pages : 56

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Author: Rezy Pradipta
Publisher: John Wiley & Sons
ISBN: 1119628881
Category : Science
Languages : en
Pages : 262

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Book Description
A Problem-Solving Workbook on Ionospheric and Space Physics Enables students to understand and master basic and advanced concepts of space, atmosphere, and ionospheric physics A Problem-Solving Workbook on Ionospheric and Space Physics is a unique textbook that contains a set of problems and exercises accompanied with complete solutions that explore and elucidate the most relevant concepts in ionospheric and space physics. The author has chosen problems that are interesting topic-wise, challenging, and that exemplify the physical and mathematical reasoning in ionospheric and space physics. Specifically, the text conveys core concepts of ionospheric and space physics using a problem-based approach. Each problem elucidates prototypical aspects that readers can easily generalize. Each problem also consists of multi-part questions to facilitate step-by-step understanding. A short introduction to each problem defines the theme and provides context to the readers. In A Problem-Solving Workbook on Ionospheric and Space Physics, readers can expect to learn about: Remote sensing of ionospheric plasmas from the ground, ionospheric slab thickness of a transparent layer, reflectometry, and doppler effects in reflection/refraction of electromagnetic waves Chapman theory of ionospheric layer formation, magnetic fields generated by the equatorial electrojet current, and fundamentals of GPS total electron content (TEC) measurements Barker codes and radar pulse compression, abel inversion of ionosonde trace data, and phase and group velocities of acoustic-gravity waves The use of deconvolution in radar scans, sporadic-E layers and Kelvin-Helmholtz instability due to wind shear, and Brunt-Vaisala frequency Thanks to the careful selection of included material, A Problem-Solving Workbook on Ionospheric and Space Physics serves as a gateway for advanced students and early-career researchers towards actual research-level problems in the field. As the problems are textbook-agnostic, students can easily self-study and learn about the subject outside the classroom.