A Magnetometer for the Determination of the Vertical Component of the Earth's Magnetic Field

1944 ◽  
Vol 15 (7) ◽  
pp. 171-177
Author(s):  
S. L. Ting ◽  
S. T. Lin
Keyword(s):  
Magnetic Field ◽  
Vertical Component ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field

Determination of the effective charge of solar cosmic-ray nuclei using the Earth's magnetic field

1984 ◽  
Vol 4 (2-3) ◽  
pp. 169-172
Author(s):  
S. Fischer ◽  
M. Vandas ◽  
K. Kudela ◽  
S.N. Kuznetsov ◽  
V.N. Lutsenko
Keyword(s):  
Magnetic Field ◽  
Effective Charge ◽  
Cosmic Ray ◽  
Earth’S Magnetic Field ◽  
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 Latitudinal variation rate of geomagnetic cutoff rigidity in the active Chilean convergent margin

2018 ◽  
Vol 36 (1) ◽  
pp. 275-285 ◽  
Author(s):  
Enrique G. Cordaro ◽  
Patricio Venegas ◽  
David Laroze
Keyword(s):  
Magnetic Field ◽  
Vertical Component ◽  
Cutoff Rigidity ◽  
Earth’S Magnetic Field ◽  
Convergent Margin ◽  
Flat Slab ◽  
Geomagnetic Cutoff Rigidity ◽  
Geomagnetic Cutoff ◽  
Variation Rate ◽  
Earth's Magnetic Field

Abstract. We present a different view of secular variation of the Earth's magnetic field, through the variations in the threshold rigidity known as the variation rate of geomagnetic cutoff rigidity (VRc). As the geomagnetic cutoff rigidity (Rc) lets us differentiate between charged particle trajectories arriving at the Earth and the Earth's magnetic field, we used the VRc to look for internal variations in the latter, close to the 70° south meridian. Due to the fact that the empirical data of total magnetic field BF and vertical magnetic field Bz obtained at Putre (OP) and Los Cerrillos (OLC) stations are consistent with the displacement of the South Atlantic magnetic anomaly (SAMA), we detected that the VRc does not fully correlate to SAMA in central Chile. Besides, the lower section of VRc seems to correlate perfectly with important geological features, like the flat slab in the active Chilean convergent margin. Based on this, we next focused our attention on the empirical variations of the vertical component of the magnetic field Bz, recorded in OP prior to the Maule earthquake in 2010, which occurred in the middle of the Chilean flat slab. We found a jump in Bz values and main frequencies from 3.510 to 5.860 µHz, in the second derivative of Bz, which corresponds to similar magnetic behavior found by other research groups, but at lower frequency ranges. Then, we extended this analysis to other relevant subduction seismic events, like Sumatra in 2004 and Tohoku in 2011, using data from the Guam station. Similar records and the main frequencies before each event were found. Thus, these results seem to show that magnetic anomalies recorded on different timescales, as VRc (decades) and Bz (days), may correlate with some geological events, as the lithosphere–atmosphere–ionosphere coupling (LAIC).

scholarly journals Atmospheric tides in the ionosphere - I. Solar tides in the F 2 region

1947 ◽  
Vol 189 (1017) ◽  
pp. 241-260 ◽  
Keyword(s):  
Magnetic Field ◽  
Vertical Component ◽  
Vertical Motion ◽  
Atmospheric Tides ◽  
Recombination Coefficient ◽  
Earth’S Magnetic Field ◽  
Dynamo Theory ◽  
Night Time ◽  
Geographical Variations ◽  
Earth's Magnetic Field

A theory, based on solar tides, is advanced to explain the anomalous seasonal, diurnal and geographical variations of F 2 region ionization. It is shown that the horizontal winds due to these tides must cause electrons to move along the lines of the earth’s magnetic field. The resultant motion has a vertical component. Account is taken of polarization of the medium by the ‘dynamo’ electric forces. Owing to viscosity the vertical motion decreases upwards in the F 2 region. Application of the equation of continuity shows that the F 2 region becomes greatly distorted. A ‘longitude effect’ is found to arise by reason of the asymmetry of the earth’s magnetic field. The theory is used to explain the high F 2 ionization densities found in low latitudes, and the high values of h' F 2 at noon near the equator. It is also used to explain the afternoon and night-time increases in ionization found at certain locations. It is suggested that the effective recombination coefficient in F 2 is much lower than the generally accepted values. It is shown that Appleton & Weekes’s evidence of lunar tidal effects in the E region does not conflict with the ‘dynamo’ theory of magnetic variations or with Pekeris’s calculations. Observational evidence of the existence of solar tides in the F 2 region is presented.

Broad-scale magnetic anomalies over central and eastern Canada: a discussion

1981 ◽  
Vol 18 (3) ◽  
pp. 657-661 ◽  
Author(s):  
R. L. Coles ◽  
G. V. Haines ◽  
W. Hannaford
Keyword(s):  
Magnetic Field ◽  
Sea Level ◽  
Vertical Component ◽  
Magnetic Anomalies ◽  
Superior Province ◽  
The South ◽  
Earth’S Magnetic Field ◽  
Eastern Canada ◽  
Earth's Magnetic Field ◽  
Broad Scale

Profiles of anomalies in the vertical component of the Earth's magnetic field over central and eastern Canada, observed at an average altitude of 4 km above sea level, show broad regions with distinctive anomaly character. These subdivisions indicate major differences in the evolutions of regions within individual structural provinces. Particularly notable is a region of intense anomalies in the northern part of the Superior Province in Quebec, contrasting with much weaker anomaly relief to the south and east.

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