By P. N. Mayaud(auth.)

###### About The Product

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

**Read or Download Derivation, Meaning, and Use of Geomagnetic Indices PDF**

**Similar geophysics books**

**Applied Geothermics for Petroleum Engineers**

The aim of utilized Geothermics for Petroleum Engineers is to offer in a transparent and concise shape tools of using the knowledge of temperature surveys in deep boreholes in addition to the result of box, laboratory and analytical investigations in geothermics to a large viewers. even supposing a few points of the topic of this ebook were mentioned in numerous earlier books and various papers, utilized Geothermics for Petroleum Engineers is the 1st booklet in this subject to be had to the petroleum engineering group.

**Antarctic and Subantarctic Pycnogonida: Ammotheidae and Austrodecidae**

Concerning the ProductPublished by way of the yank Geophysical Union as a part of the Antarctic examine sequence. content material:

**Rock Physics & Phase Relations: A Handbook of Physical Constants**

In regards to the ProductPublished via the yank Geophysical Union as a part of the AGU Reference Shelf sequence. the aim of this instruction manual is to supply, in hugely available shape, chosen severe information for pro and pupil sturdy Earth and planetary geophysicists. insurance of themes and authors have been conscientiously selected to satisfy those pursuits.

- Physics of Sedimentology: Textbook and Reference
- Dynamics of Plate Interiors
- Dynamics of Passive Margins
- Basic Steps in Geostatistics: The Variogram and Kriging

**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.