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By P. N. Mayaud(auth.)

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Published through the yank Geophysical Union as a part of the Geophysical Monograph Series.

Content:
Chapter 1 advent (pages 1–2): P. N. Mayaud
Chapter 2 what's a Geomagnetic Index? (pages 2–4): P. N. Mayaud
Chapter three A old assessment of previous Indices (pages 4–16): P. N. Mayaud
Chapter four variety 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 type 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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Extra info for Derivation, Meaning, and Use of Geomagnetic Indices

Sample text

The two bars drawn across curve a indicate the approximate upper border of the subauroral latitude band and the approximate lower border of the mid-latitude band [after Mayaud, 19681. GEOMAGNETIC INDICES ranges. However, we will have to evaluate the partial incidences of the method in the computation of the am indices. 4. The quantization problem. This last point has been recently raised by Bubenik and Fraser-Smith [1977]. Studying the frequency distributions of Kp and aa indices (such planetary indices are derived from K indices), they observe irregularities in the distributions that they attribute to the 'quantization' of the K indices; that is, because K indices consist in scaling classes of ranges and not the ranges themselves, the midclass ranges resulting from the conversion of the K constitute a set of discrete values instead of a continuous series of ranges.

Midclass ranges (or weights) for the conversion of the K indices. What values should be used for the transformation of the K? Table 4 gives the first weights given by Bartels and Veldkamp [1954, p. 41 and given again by Bartels [1957b, p. 2291 and in the present IAGA Bulletins 32 and compares them with the true midclass ranges r, for a K scale with a lower limit of 250 y for K = 9. 3 when reviewing the equivalent range up. In our opinion the best weights are the values r, which themselves are not strictly proportionate to the weights given in the atlas of K indices [Mayaud, 1967a, p.

A given observatory took (or was attributed to have taken) a certain limit because of its latitude in this coordinate system; one now knows that such a system does not work in organizing the data as far as auroral variations are concerned. A resolution was adopted by IAGA in 1963 (IAGA Bulletin, 19, 1963, p. 359, resolution 4) for avoiding in the future incorrect choices at a new observatory: the Working Group on Geophysical Indices must be consulted. The latitude variation of the irregular variations to which K indices are mainly sensitive is such that proportionate scales will never give an assimilation of the distributions within a wide range of latitudes.

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