The Ionosphere
IGY Instruction Manual
Published on 22. October 2013
194 pages
978-1-4832-2655-2 (ISBN)
Description
Annals of the International Geophysical Year, Volume III: The Ionosphere covers the main branches of ionospheric research, particularly the vertical-incidence sounding technique. This volume is composed of seven chapters and begins with an introduction to the basic technique of pulse-sounding for most ionospheric studies. The next chapters describe the elementary theory basic to the understanding of ionospheric soundings and their physical interpretation. This topic is followed by examination of the basic principles, antenna systems, and photographic processing of sounding equipment. Other chapters highlight the interpretation and reduction of ionograms. The last chapter provides guidelines to observers for the maintenance of high standards of performance of the ionosonde, of scaling and of reporting their observations. This book will be of useful to geophysicists, equipment designers, and researchers in the field.
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Content
1. Introduction2. The International Geophysical Year 2.1 Historical 2.2 IGY Program 2.21 Regular World Days (RWD) 2.22 Alerts and Special World Intervals (SWI) 2.23 World Meteorological Intervals (WMI) 2.24 Operations on Specially Designated Days 2.25 Sounding Schedules for Ionospheric Observations3. Ionospheric Physics 3.1 Introduction 3.11 Electromagnetic Waves 3.12 The Sun 3.13 Atomic Physics 3.14 Geophysics-The Earth and Its Atmosphere 3.2 Ionospheric Structure 3.21 The Ionospheric Regions 3.22 Nomenclature 3.23 Ionized Layer Formation 3.24 Ionization Decay and the Diurnal Variability of the Ionosphere 3.3 Behavior of Radio Waves in Ionized Media 3.31 General Description 3.32 Theory 3.33 Deductions from Equation for Refractive Index 3.34 The Concept of Virtual Height 3.35 Vertical-Incidence Sweep Frequency Soundings 3.4 Effect of the Earth's Magnetic Field 3.41 General Description 3.42 Motion of Charged Particles in a Magnetic Field 3.43 The Expression for Refractive Index in the Presence of a Magnetic Field (Neglecting Collisions) 3.44 Effects of the Geomagnetic Field on h'f Soundings 3.45 The Third Magneto-Ionic Component 3.46 The Lateral Deviation of Radio Waves in the Ionosphere 3.5 Ionospheric Absorption 3.51 General Description 3.52 Absorption Theory 3.53 Deductions from the Theory-Types of Absorption 3.54 Effects of Absorption on h'f Soundings 3.6 Scattering of Radio Waves in the Ionosphere 3.61 General Description 3.62 Spread Echoes 3.63 Sporadic E 3.7 Variability of the Ionosphere 3.71 Diurnal Variation 3.72 Seasonal Variations 3.73 Solar Cycle Variability 3.74 Short-Term Fluctuations 3.75 Ionospheric Storms 3.8 Oblique Incidence Propagation 3.81 General Description 3.82 Theory 3.83 Conversion of Vertical-Incidence h'f Curve to Corresponding Oblique-Incidence Curve 3.84 Transmission Curves 3.85 Transmission Factors 3.9 Methods of True Height Analysis 3.91 Introduction 3.92 Exact Solution Neglecting the Earth's Magnetic Field 3.93 Exact Solutions including the Earth's Magnetic Field 3.94 Approximate Methods of Solution Neglecting Magnetic Field 3.95 Approximate Methods including Effects of the Magnetic Field 3.96 The Effect of Lower Layers4. Sounding Equipment 4.1 Pulse Measurements-General 4.2 The Typical Ionosonde 4.21 General Description 4.22 Essential Units 4.23 Accuracy and Reliability 4.24 Power Stabilization 4.25 Short Description of Different Ionosondes 4.3 Adjustments of the Ionosonde 4.31 Pulse Generator 4.32 Calibration Checks 4.33 Receiver Gain 4.34 Schedule of Sweeps 4.35 Use of Expanded Height-Scale 4.36 Oscilloscope Adjustments 4.37 Camera Focus Adjustments 4.38 Use of Auxiliary Gear 4.39 Systematic Maintenance Procedure 4.4 Antenna Systems 4.41 General Requirements 4.42 Practical Systems 4.43 Transmission Lines 4.5 Photographic Processing 4.51 Chemicals 4.52 Auxiliary Equipment 4.53 Loading Developing Reels 4.54 Processing 4.55 Time and Temperature Considerations 4.56 Washing and Drying 4.57 Splicing5. Interpretation of Ionograms 5.1 Introduction 5.2 Selection Op The Fundamental Trace 5.21 Multiples 5.22 Magneto-Ionic Components 5.23 Transitional Phenomena 5.24 Spread Echoes 5.3 Identification of the Layers 5.31 E Region 5.
