New PDF release: Derivation, Meaning, and Use of Geomagnetic Indices

By P. N. Mayaud(auth.)

ISBN-10: 0875900224

ISBN-13: 9780875900223

ISBN-10: 1118663837

ISBN-13: 9781118663837

About The Product

Published via the yankee Geophysical Union as a part of the Geophysical Monograph Series.

Chapter 1 creation (pages 1–2): P. N. Mayaud
Chapter 2 what's a Geomagnetic Index? (pages 2–4): P. N. Mayaud
Chapter three A old evaluate of prior Indices (pages 4–16): P. N. Mayaud
Chapter four diversity Indices (K, R, Q) (pages 16–40): P. N. Mayaud
Chapter five Planetary Indices Derived From okay Indices (Kp, am, and aa) (pages 40–85): P. N. Mayaud
Chapter 6 class of Days or of Any period of Time (pages 85–96): P. N. Mayaud
Chapter 7 The AU, AL and AE Indices (pages 96–115): P. N. Mayaud
Chapter eight The Dst Index (pages 115–129): P. N. Mayaud
Chapter nine end (pages 129–134): P. N. Mayaud

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Additional resources for Derivation, Meaning, and Use of Geomagnetic Indices

Example text

In particular, no arithmetic average made with logarithms is justified; it is much less so when the numbers are not true logarithms. What is this scale? The model of all scales is the one introduced for Niemegk, a typical subauroral station. The description and the justification given by Bartels et al. [1939, p. a of the successive steps is as follows (see Table 1): 'the scale proceeds by multiples of 2 up to the range r = 40 y but then more slowly because otherwise the index would have become too coarse (for instance, 320 5 r < 640 y for K = 7)' and the higher indices 8 and 9 would never be reached.

The subauroral latitudes are more suitable for a valuable and reliable 3-h index; remember that K indices were first introduced for the Niemegk Observatory, whose corrected geomagnetic latitude is 49 ". We tried previously [Mayaud, 1967a, pp. 21-30) to estimate the variation in the amplitude of the ranges for various time intervals (between 1 and 24 h) at a subauroral station. We are not fully convinced of the significance of these comparisons. Our conclusion, however, was that the right time interval is between 1 and 3 h.

It would not be the case with a 1-h interval. (4) When dealing with the zero level a further point will come out in favor of a 3-h interval. Once the length is chosen, one has to ask whether the morphology of the irregular variation significantly changes with the level of the activity. A positive answer would mean that a certain inconsistency would result when comparing or averaging data for various activity levels. Figure 8 shows normal sensitivity records for 2 different days at a subauroral station, but the lowsensitivity record is also given for the day which is much more disturbed.

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Derivation, Meaning, and Use of Geomagnetic Indices by P. N. Mayaud(auth.)

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