Spatial-time disturbance of geomagnetic field for some territories of the north and southern hemispheres: ecological aspect

2018 ◽  
Author(s):  
M. Orlyuk ◽  
А. Romenets
Keyword(s):  
Geomagnetic Field ◽  
Ecological Aspect ◽  
The North

Paleomagnetism of the Great Slave Supergroup, Northwest Territories, Canada: the Stark Formation

1976 ◽  
Vol 13 (4) ◽  
pp. 563-578 ◽  
Author(s):  
D. K. Bingham ◽  
M. E. Evans
Keyword(s):  
Northwest Territories ◽  
North American ◽  
Geomagnetic Field ◽  
Pole Position ◽  
The West ◽  
Stratigraphic Sequence ◽  
Polar Wander ◽  
Early Proterozoic ◽  
The North ◽  
Polarity Reversals

Paleomagnetic results from 55 sampling sites throughout the Stark Formation are reported. The known stratigraphic sequence of these sites enables the behaviour of the geomagnetic field in these remote times (1750 m.y.) to be elucidated. Two polarity reversals are identified and these represent potentially useful correlative features in strata devoid of index fossils. One of these is investigated in detail and indicates that behaviour of the geomagnetic field during polarity reversals was essentially the same in the early Proterozoic as it has been over the last few million years. The pole position (145°W, 15°S, dp = 3.5, dm = 6.9) lies far to the west of that anticipated from earlier results, implying further complexity of the North American polar wander curve. Possible alternatives to this added complexity are discussed.

Palaeomagnetic investigations in Great Britain

1957 ◽  
Vol 250 (974) ◽  
pp. 71-72 ◽  
Keyword(s):  
Great Britain ◽  
Geomagnetic Field ◽  
Horizontal Plane ◽  
The North ◽  
Greenwich Meridian

Positions on the globe are given by the colatitude (θ) and the longitude (∅), measured from the north geographical pole and from the Greenwich meridian eastwards, respectively.The declination of the geomagnetic field or a palaeomagnetic direction (D ) is measured from the geographical meridian eastwards and the inclination (I) (the term * angle of dip ’ is not used here because of possible confusion with the term ‘geological dip’) is measured from the horizontal plane, positive if the north-seeking pole is below the horizon, negative if it is above.

Geomagnetic variations in the British Isles and their relation to electrical currents in the ocean and shallow seas

1971 ◽  
Vol 270 (1204) ◽  
pp. 289-323 ◽  
Keyword(s):  
Geomagnetic Field ◽  
Sea Water ◽  
Vertical Component ◽  
Temporal Variations ◽  
Thin Strip ◽  
Vertical Force ◽  
British Isles ◽  
Geomagnetic Variations ◽  
The North ◽  
Shallow Seas

The analysis and interpretation of the temporal variations of the geomagnetic field observed at fortny nine stations in the British Isles are presented. The variations in the horizontal components are very similar over the whole area, while the variations of the vertical force may show large differences between stations less than 80km apart. At nearly all stations there is a correlation between the variations of the vertical component and some component of the horizontal field. For variations of period exceeding 120 min, this correlation is mainly caused by electric currents induced in the Atlantic Ocean. The results are compatible with the theoretical response derived for induction in a thin strip model of the Ocean For variations of a period less than 90 min, concentrations of current also flow in the sea water surrounding the British Isles. It is postulated that these currents too are produced by induction in the Ocean, being frequency dependent branch currents flowing from the Ocean into the shallow seas. A current concentration flowing NE-SW through southern Scotland has been delineated This current, which has frequency characteristics similar to the currents in the shallow seas, could be drive by an electric potential between the North and Irish Seas. The presence of a long narrow structure in the crust with only a small conductivity contrast would then be sufficient to channel the current and produce the observed anomaly in the geomagnetic field.

Latitudinally propagating on–off switching aurorae and associated geomagnetic pulsations: A case study of an event of February 20, 1980

1981 ◽  
Vol 59 (8) ◽  
pp. 1131-1136 ◽  
Author(s):  
T. Oguti ◽  
S. Kokubun ◽  
K. Hayashi ◽  
K. Tsuruda ◽  
S. Machida ◽  
...  
Keyword(s):  
Geomagnetic Field ◽  
Auroral Zone ◽  
Geomagnetic Pulsations ◽  
The North ◽  
Field Fluctuations ◽  
Auroral Latitude ◽  
East West

Poleward propagating on–off switching aurorae and equatorward propagating aurorae, otherwise similar, were observed simultaneously at Rabbit Lake and La Ronge, respectively, for about 40 min before dawn of Feb. 20, 1980. Rabbit Lake is a high auroral latitude site, at the northern end of the Saskatchewan chain of stations for the Pulsating Aurora Campaign, whereas La Ronge, due south of Rabbit, is almost at the southern edge of the auroral zone. The repetition periods of the on–off switching aurorae are about 6 to 13 s. The poleward propagating aurorae had well defined fronts of light which extended a few hundred kilometres or more in the east–west direction. The light fronts of the equatorward propagating aurorae, though comparable in extent, were less well defined: they were thicker and fuzzier. The poleward propagating aurorae moved with a speed ~10 km/s whereas the equatorward ones did so with a slightly greater velocity. Geomagnetic field fluctuations were concurrent with the aurorae at both sites. At Rabbit Lake, northward (southward) field changes were associated with upward (downward) changes whereas the trend is reversed at La Ronge, viz., northward (southward) changes with downward (upward) changes. These trends are consistent with a model of a periodic occurrence of two line currents, westward and eastward, the former moving poleward north of Rabbit Lake and the latter approaching La Ronge from the north.

scholarly journals AS FOLLOWS FROM OUR MODEL THE NORTH MAGNETIC POLE IS STABLE IN ITS DRIFT

2019 ◽  
pp. 65-76
Author(s):  
B.В. Кузнецов
Keyword(s):  
Geomagnetic Field ◽  
Magnetic Anomalies ◽  
Magnetic Pole ◽  
The West ◽  
The North ◽  
Drift Model ◽  
North Magnetic Pole ◽  
Resolute Bay ◽  
Magnetic Observatories

Северный магнитный полюс движется согласно модели дрейфа, предложенной канадским магнитологом Хоупом 1 и разработанной автором этой статьи 2, 3. В основе модели участие двух глобальных магнитных аномалий (ГМА): Канадской (КМА) и Сибирской (СМА). Вблизи этих ГМА расположены магнитные обсерватории: РезольютБей (RB Resolute Bay) в Канаде и Мыс Челюскин (CCh Cape Chelyskin) в России. Обсерватории регистрируют изменения величин Нкомпонент модуля геомагнитного поля (ГМП), причем в настоящее время в Канадском секторе регистрируется увеличение модуля ГМП, а в Сибирском, его уменьшение. Точка, в которой направленные навстречу векторы Нкомпонент равны друг другу, а Нкомпонента равна нулю, и есть СМП. Скорость дрейфа СМП определяется скоростью увеличения (или уменьшения) величин соответствующих ГМА. Использование этой простейшей схемы позволило автору давать очень точные прогнозы мест расположения СМП. Точно так же было определено время перехода СМП из Западного полушария в Восточное (лето 2019). Точность методики определяется исключительно точностью аппроксимации величины Нкомпонент 24. The North Magnetic Pole submits its moving to the drift model proposed by Canadian magnitologist Hope 5 and this developed by the author 6,7 which suggests an impact of two global magnetic anomalies (GMA), Canadian (CMA) and Siberian (SMA) into the pole drift. Magnetic observatories Resolute Bay, Canada, and Cape Chelyskin, Russia, located near these GMA, are recording the Hcomponent values. Nowadays increasing at the Canada area the geomagnetic field module is decreasing at the Siberia one. The NMP is the point where the vectors of Hcomponent directed towards each other are equal and the value of Hcomponent makes zero. The velocity of the NMP drift is determined by the fluctuating rate of GMA magnitudes. This technique enabled the author to predict as the NMP positions and the time of the NMP transit from the West hemisphere to the East one as 2019, summer. The technique accuracy is governed by accuracy of Hcomponent values approximation 6, 7, 13.

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