Globally Correlated Ground Magnetic Disturbances During Substorms

2021 ◽  
Vol 126 (4) ◽  
Author(s):  
Shinichi Ohtani ◽  
Shun Imajo ◽  
Aoi Nakamizo ◽  
Jesper W. Gjerloev
Keyword(s):  
Ground Magnetic ◽  
Magnetic Disturbances

scholarly journals The mechanism of mid-latitude Pi2 waves in the upper ionosphere as revealed by combined Doppler and magnetometer observations

2013 ◽  
Vol 31 (4) ◽  
pp. 689-695 ◽  
Author(s):  
V. A. Pilipenko ◽  
E. N. Fedorov ◽  
M. Teramoto ◽  
K. Yumoto
Keyword(s):  
Large Scale ◽  
Vertical Displacement ◽  
Alfven Wave ◽  
Doppler Velocity ◽  
Low Latitude ◽  
Radar Network ◽  
Compressional Mode ◽  
Ground Magnetic ◽  
Magnetic Disturbances ◽  
Upper Ionosphere

Abstract. The interpretation of simultaneous ionospheric Doppler sounding and ground magnetometer observations of low-latitude Pi2 waves is revised. We compare the theoretical estimates of the ionospheric Doppler velocity for the same amplitude of the ground magnetic disturbances produced by a large-scale compressional mode and an Alfvén mode. The plasma vertical displacement caused by the wave electric field is shown to be the dominating effect. Taking into account the correction of the previous paper, the observations of low-latitude Pi2 in the F layer ionosphere by Doppler sounding and SuperDARN (Super Dual Auroral Radar Network) radars give consistent results. We suggest that the Doppler response to Pi2 waves is produced by the Alfvén wave component, but not the fast-mode component, whereas the ground magnetic signal is composed from both Alfvén and fast magnetosonic modes.

Electronic properties of quasi two-dimensional transition metals chalcogenides with low-dimensional magnetism

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (7) ◽  
pp. 87-95
Author(s):  
M. S. Baranava ◽  
P. A. Praskurava
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Exchange Interaction ◽  
Electronic Properties ◽  
Metal Atom ◽  
Transition Metal Atom ◽  
Two Dimensional ◽  
Transition Metal Atoms ◽  
Ground Magnetic ◽  
Low Dimensional

The search for fundamental physical laws which lead to stable high-temperature ferromagnetism is an urgent task. In addition to the already synthesized two-dimensional materials, there remains a wide list of possible structures, the stability of which is predicted theoretically. The article suggests the results of studying the electronic properties of MAX3 (M = Cr, Fe, A = Ge, Si, X = S, Se, Te) transition metals based compounds with nanostructured magnetism. The research was carried out using quantum mechanical simulation in specialized VASP software and calculations within the Heisenberg model. The ground magnetic states of twodimensional MAX3 and the corresponding energy band structures are determined. We found that among the systems under study, CrGeTe3 is a semiconductor nanosized ferromagnet. In addition, one is a semiconductor with a bandgap of 0.35 eV. Other materials are antiferromagnetic. The magnetic moment in MAX3 is localized on the transition metal atoms: in particular, the main one on the d-orbital of the transition metal atom (and only a small part on the p-orbital of the chalcogen). For CrGeTe3, the exchange interaction integral is calculated. The mechanisms of the formation of magnetic order was established. According to the obtained exchange interaction integrals, a strong ferromagnetic order is formed in the semiconductor plane. The distribution of the projection density of electronic states indicates hybridization between the d-orbital of the transition metal atom and the p-orbital of the chalcogen. The study revealed that the exchange interaction by the mechanism of superexchange is more probabilistic.

scholarly journals I. Notices of some conclusions derived from the photographic records of the Kew declinometer, in the years 1858,1859, 1860, and 1861

1862 ◽  
Vol 11 ◽  
pp. 585-590
Keyword(s):  
Relative Frequency ◽  
Magnetic Force ◽  
Total Force ◽  
Magnetic Disturbances ◽  
Different Parts ◽  
Made In ◽  
Photographic Records

The discussion of the magnetic observations which have been made in different parts of the globe may now be considered to have established the three following important conclusions in regard to the magnetic disturbances: viz., 1. That these phenomena, whether of the declination, inclination, or total force, are subject in their mean effects to periodical laws, which determine their relative frequency and amount at different hours of the day and night. 2. That the disturbances which occasion westerly and those which occasion easterly deflections of the compass-needle, those which increase and those which decrease the inclination, and those which increase and those which decrease the magnetic force have all distinct and generally different periodical laws.

scholarly journals Are External Magnetic Disturbances Suppressed by Magnetometer Noise when Estimating a Nanosatellite’s Rotational Motion?

2020 ◽  
Vol 53 (2) ◽  
pp. 14888-14893
Author(s):  
Demet Cilden-Guler ◽  
Zerefsan Kaymaz ◽  
Chingiz Hajiyev
Keyword(s):  
Rotational Motion ◽  
Magnetic Disturbances

Interpretation of ground magnetic data in Suyoc, Mankayan Mineral District, Philippines

2021 ◽  
Author(s):  
Creszyl Joy J. Arellano ◽  
Leo T. Armada ◽  
Carla B. Dimalanta ◽  
Karlo L. Queaño ◽  
Eric S. Andal ◽  
...  
Keyword(s):  
Magnetic Data ◽  
Ground Magnetic ◽  
Mineral District

Optical filtering of airborne and ground magnetic data

1976 ◽  
Vol 114 (4) ◽  
pp. 663-683 ◽  
Author(s):  
M. K. Seguin ◽  
H. H. Arsenault
Keyword(s):  
Magnetic Data ◽  
Optical Filtering ◽  
Ground Magnetic

Statistical study of magnetic disturbances at the Earth's surface

2006 ◽  
Vol 68 (8) ◽  
pp. 930-936 ◽  
Author(s):  
Andrés R.R. Papa ◽  
Luiz M. Barreto ◽  
Ney A.B. Seixas
Keyword(s):  
Statistical Study ◽  
Magnetic Disturbances
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