MEASUREMENT OF THE HORIZONTAL COMPONENT OF THE EARTH'S MAGNETIC FIELD BY A SIMPLIFIED ABSOLUTE METHOD

1917 ◽  
Vol 17 (4) ◽  
pp. 306-308
Author(s):  
Lindley Pyle
Keyword(s):  
Magnetic Field ◽  
Horizontal Component ◽  
Earth’S Magnetic Field ◽  
Absolute Method ◽  
Earth's Magnetic Field

On the determination of the horizontal component of the earth's magnetic field by a coupled oscillations method

1932 ◽  
Vol 28 (1) ◽  
pp. 109-114
Author(s):  
L. G. Vedy
Keyword(s):  
Magnetic Field ◽  
Equations Of Motion ◽  
Magnetic Interaction ◽  
Horizontal Component ◽  
Simple Experiment ◽  
Earth’S Magnetic Field ◽  
Coupled Oscillations ◽  
Oscillatory Systems ◽  
Earth's Magnetic Field

An account is given of a simple experiment designed to illustrate quantitatively the phenomena of coupled oscillations. Two similar small magnets are suspended in the earth's magnetic field at a suitable distance apart so that there is appreciable magnetic interaction between the two oscillatory systems. Under the conditions employed, the equations of motion reduce to a simple form, and the experiment may be used as a method of measuring the intensity of the horizontal component of the earth's magnetic field.

scholarly journals A magnetometer for the measurement of the Earth's vertical magnetic intensity in C. G. S. measure

1928 ◽  
Vol 117 (777) ◽  
pp. 434-458 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Vertical Component ◽  
Field Measurements ◽  
Horizontal Component ◽  
Magnetic Intensity ◽  
Earth’S Magnetic Field ◽  
Simple Operation ◽  
Horizontal Field ◽  
Earth's Magnetic Field

The measurement of the vertical component of the earth’s magnetic field is a less simple operation than that of the horizontal component. The horizontal field measurements are on a satisfactory basis, whether made by the swinging magnet method, or by the more recently developed electric magnetometers, in which known magnetic fields may be provided by means of known currents flowing through coils of known dimensions.

scholarly journals X. A determination of the value of the earth's magnetic field in international units, and a comparison of the results with the values given by the Kew observatory standard instruments

1902 ◽  
Vol 198 (300-311) ◽  
pp. 431-462 ◽  
Keyword(s):  
Magnetic Field ◽  
Horizontal Component ◽  
Earth’S Magnetic Field ◽  
Ordinary Method ◽  
Earth's Magnetic Field ◽  
The Absolute ◽  
Comparison Of The Results

The discrepancies found by Professor Rücker and the author to exist between the values for the horizontal component of the earth’s magnetic field, as measured by the absolute instruments in use in the various British observatories, were so great that it seemed of interest to measure the field at one of the observatories by an entirely different method, in order, if possible, to obtain some indication as to the reliability of the various instruments. Further, in the ordinary method of measuring H, a correction has to be applied on account of the distribution of the magnetism in the magnets employed, about the value of which there is some uncertainty.

A determination of the value of the Earth’s magnetic field in international units and a comparison of the results with the value given by the Kew observatory standard instruments

1902 ◽  
Vol 69 (451-458) ◽  
pp. 1-1
Keyword(s):  
Magnetic Field ◽  
Great Britain ◽  
Horizontal Component ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Comparison Of The Results

A comparison of the readings given by the magnetometers used for measuring the horizontal component of the earth’s magnetic field at the various observatories in Great Britain having shown the existence of very marked discrepancies, although the instruments employed are all of the same type, it seemed of interest to employ some entirely different method for the measurement of H, and to compare the results with those given by the unifilar magnetometers.

scholarly journals Correlation Between Sporadic E Ionization and the Strength of the Horizontal Component of the Earth's Magnetic Field

1962 ◽  
Vol 15 (2) ◽  
pp. 236 ◽  
Author(s):  
JR Wilkie ◽  
RWE McNicol
Keyword(s):  
Magnetic Field ◽  
Short Duration ◽  
Horizontal Component ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Sporadic E

By analysis of geomagnetic and ionospheric data recorded at Brisbane it has been found that the horizontal component of the Earth's magnetic field is decreased in strength by a few gammas during the appearance on ionograms of short-duration echoes, normally interpreted as coming from isolated patches of Es ionization.

scholarly journals Local K-index scales correction for the high-latitude magnetic stations

2021 ◽  
Vol 67 (1) ◽  
pp. 89-99
Author(s):  
A. V. Frank-Kamenetsky ◽  
V. D. Nikolaeva ◽  
N. A. Stepanov ◽  
A. S. Kalishin
Keyword(s):  
Magnetic Field ◽  
Geomagnetic Latitude ◽  
Lower Boundary ◽  
Horizontal Component ◽  
The Arctic ◽  
Russian Arctic ◽  
Earth’S Magnetic Field ◽  
Significant Discrepancy ◽  
K Index ◽  
Earth's Magnetic Field

To assess the magnetic activity, various indices (numerical characteristics of the planetary and local disturbance of the Earth’s magnetic field) are used. Most widely used for various purposes are the planetary Kp-index and the local K-index, proposed by Bartels. The K-index characterizes the Earth’s magnetic field disturbance in a 3-hour interval (0–3, 3–6, etc. UTC) and is defined in a range from 0 to 9 by the amplitude of the horizontal component deviation from the quiet level. K = 0 indicates the absence of geomagnetic activity, and K = 9 corresponds to a strong geomagnetic storm. The lower limit of K = 9 is the amplitude of magnetic field horizontal component variation above which the K-index is assigned the maximum value of 9. This limit is selected individually for each station, depending on its geomagnetic latitude. The latest scales of the K-indices boundaries for the Russian Arctic stations were determined in the middle of the last century and have not been corrected since then. The significant discrepancy between the K-indices calculated using these scales and the planetary Kp-index shows that they had to be refined, and in some cases, they must be re-selected. The local indices lower boundaries (K = 9) for stations in the Arctic Russian sector were determined. K-indices lower boundaries were received for the strong magnetic storm according to the IAGA procedure. It is shown that for different magnetic field horizontal component variation values K-indices for different observation points practically coincide with the Kp-index. The lower value K = 9 dependence on the observation point geomagnetic latitude is presented. This relation can be used to obtain the lower boundary of K = 9 for any magnetic station. A table with local K-index scales for Russian Arctic magnetic stations has been compiled.

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