Derivation, Meaning, and Use of Geomagnetic Indices

Title Page
......Page 1
Copyright
......Page 2
Contents
......Page 4
Foreword......Page 6
1. Introduction......Page 7
2. What Is a Geomagnetic Index?......Page 9
3.2. Indices C and Ci and C9......Page 12
3.3. CIassification of Days......Page 15
3.4. Declination Ranges at Greenwich......Page 17
3.6 The Norwegian 'Storminess' Index......Page 18
3.7. The u Measure of Geomagnetic Activity......Page 19
3.8. The W Index......Page 22
3.9. From Past Indices to the Present IAGA Indices......Page 23
4.1. A Preliminary Description......Page 25
4.2. The Range or Other Alternatives......Page 27
4.3. The Length of the Constant Time Interval......Page 32
4.4. The Zero Level......Page 33
4.5. Use of the Largest Range in the Horizontal Components......Page 36
4.6. Classes of Ranges and K Indices......Page 39
4.7. Subjective Character of the K Scalings?......Page 47
4.8. Conclusion......Page 49
5.1. The Kp Index......Page 50
5.2. The am Range Index......Page 62
5.3. The aa Index......Page 86
5.4. A Quantitative Comparison of the Average am, aa, and up Indices
......Page 91
6. Classification of Days or of Any Interval of Time......Page 96
6.1. The International Classification......Page 97
6.2. Classification of Time Intervals From an Estimation of the Activity Level......Page 104
7.1. The Ideal Scheme of the AU, AL, and AE Indices......Page 108
7.2. The Actual Derivation......Page 111
7.3. Tabulation of the Indices......Page 117
7.4. Artificial and True Features in A U and AL Indices......Page 118
8. The Dst Index......Page 128
8.1. The Previous Attempts......Page 130
8.2. The Ideal Scheme of the Dst Index......Page 132
8.3. The Actual Derivation......Page 134
8.5. Artificial and True Features of the DstIndex......Page 136
Conclusion......Page 142
9.1. Are Other Geomagnetic Indices Needed?......Page 143
9.2. Meaning and Use of the Present Indices......Page 145
Truly Worldwide Irregular Variations With a Zonal Component......Page 149
Potentially Worldwide Irregular Variations Without Zonal Component......Page 150
Conclusion......Page 151
Appendix B List of Observatories......Page 152
References......Page 154
List of Geomagnetic Index Symbols......Page 155
Thematic Index......Page 156