




S. No. 
Chapter 
Title of the Chapters 
Page 
Size (KB) 





1 
0 
Contents 

50.12 KB 





2 
1 
Introduction 
1 
44.6 KB 





3 
2 
Characteristics of the AEROSSatellites 
6 
156.31 KB 

2.1 
Impedance Probe 
8 

2.1.1 
Theoretical Principle 
8 

2.1.2 
Principle of Measurement 
10 

2.1.3 
Data Interpretation 
11 

2.2 
Retarding Potential Analyzer 
11 

2.2.1 
Principle of Measurement 
12 

2.2.2 
Obtaining Electron Density Data from RPA Data 
13 

2.3 
Figures 
15 





4 
3 
Numerical Mapping of the F2layer 
21 
132.86 KB 

3.1 
Mathematical Formulation of the CCIR Numerical Map 
21 

3.2 
Choice of main Latitudinal Variable 
22 

3.3 
Diurnal Variation 
23 

3.4 
Calculation of Coefficients for Geographic Coordinate Functions 
24 

3.5 
Effect of "Screen point" Analysis on CCIR Maps 
25 

3.6 
Ching and Chiu's Ionospheric Model 
28 

3.7 
Tables 
31 

3.8 
Figures 
33 





5 
4 
Bent's Ionospheric Model and its use in obtaining Peak Densities from insitu Data 
37 
296.75 KB 

4.1 
Bent's Ionospheric Profile 
37 

4.1.1 
Profile Functions 
38 

4.1.2 
F2layer Critical Frequency, foF2 
39 

4.1.3 
F2layer Peak Height, hmF2 
39 

4.1.4 
Halfthickness, Y m 
39 

4.1.5 
Half thickness, Y t 
41 

4.1.6 
Decay Constants, k 1 , k 2 , k 3 
41 

4.2 
Comparison with IRI Profile 
42 

4.3 
Comparison with AEROSB Data 
43 

4.4 
Latitudinal Dependence of Profile Parameters 
45 

4.5 
Some Remarks on using Bent's Model 
46 

4.6 
Harmonized Bent's Model 
47 

4.7 
Derivation of Peak Density from insitu Measurements 
49 

4.8 
Maximum Error in Height Reduction 
50 

4.9 
Relationship between f and foF2 
53 





6 
5 
Models for the Height of the F21ayer Peak 
73 
262.3 KB 

5.1 
Becker's Relation 
74 

5.2 
Ching and Chiu's Model 
75 

5.3 
Shimazaki's Relation 
76 

5.4 
Corrections 
77 

5.4.1 
Bradley and Dudeney's Correction 
77 

5.4.2 
Eyfrig's Correction 
78 

5.5 
Dudeney's Model 
78 

5.6 
Bent's Relation 
79 

5.7 
Bilitza's Model 
80 

5.8 
hmF2 from AEROSB insitu Electron Density Data 
81 

5.9 
Comparisons of Models and Data 
83 

5.10 
Improved Model 
84 

5.11 
Nisbet's MK1 Model 
85 

5.12 
Comparative Remarks 
87 

5.13 
Figures 
89 





7 
6 
Peak Densities from AEROS insitu Measurements and Comparisons with CCIR Predictions 
104 
382.38 KB 

6.1 
Longitudinal Variation of Peak Density over Four Longitude Ranges 
106 

6.2 
Long1tudinal Variations at higher Latitudes 
108 

6.3 
Comparisons with Theoretical Calculations Introducing Effects of Neutral Air Winds 
109 

6.4 
Density Var1ations at Night 
112 

6.5 
Longitudinal Variations at Midlatitudes 
115 

6.6 
Longitudinal Variations at LowLatitudes 
116 

6.7 
Comparison with Ching & Chiu's Model 
119 

6.8 
Comparison of Results for August 74 and August 75 
120 

6.9 
Seasonal Variations of Electron Density 
120 

6.10 
Electron Density in the South Atlantic Anomaly 


6.11 
Region 
121 

6.12 
Figures 
124 





8 
7 
Modification of the CCIR Numerical Map 
148 
329.79 KB 

7.1 
Harmonic Analysis in Longitude 
148 

7.2 
First Modification of the CCIR Map 
151 

7.3 
Second Modification of the CCIR Map 
153 

7.4 
Numerical Map in Local Time 
156 

7.5 
Conclusions 
161 

7.6 
Tables 
163 

7.7 
Figures 
168 





9 
8 
Acknowledgement 
184 
187.34 KB 





10 
9 
List of Symbols 
185 
454.42 KB 





11 
10 
References 
186 
87.72 KB 





12 
11 
Appendix 
187 
237.54 KB 




