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Title:Analiza fizikalnega modela za izračun gostote magnetnega polja Zemlje
Authors:ID Gavez, Biserka (Author)
ID Dobovišek, Andrej (Mentor) More about this mentor... New window
ID Slavinec, Mitja (Comentor)
Files:.pdf UN_Gavez_Biserka_2015.pdf (1,54 MB)
MD5: 7CD59B67202BEA33855595517A5EAAB1
 
Language:Slovenian
Work type:Undergraduate thesis
Typology:2.11 - Undergraduate Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:V diplomskem delu obravnavamo magnetno polje Zemlje. K temu prispeva magnetno polje notranjega in zunanjega izvora. Magnetno polje notranjega izvora povzročajo vrtinčasti konvekcijski električni tokovi v tekočem zunanjem delu jedra Zemlje, ki se nahaja na globini med 2800 do 5000 km pod površjem. Ta del jedra je sestavljen iz tekočega železa, niklja in silicija z manjšimi primesmi žvepla in kisika. Magnetno polje notranjega izvora lahko opišemo kot polje magnetnega dipola. Magnetno polje zunanjega izvora povzročajo visoko energijski kozmični delci. Ti delci ionizirajo atome in molekule v zgornjih plasteh Zemljine atmosfere. Horizontalni tokovi ioniziranih delcev so izvor magnetnega polja zunanjega izvora. V diplomskem delu naredimo pregled observatorijev, ki opravljajo meritve gostote magnetnega polja Zemlje. Ob tem podrobneje predstavimo spletno stran Svetovnega podatkovnega centra za geomagnetizem iz Kyota. Predstavimo tudi edini observatorij za meritve gostote magnetnega polja v Sloveniji, to je Geomagnetni observatorij Sinji vrh nad Ajdovščino. V nadaljevanju opišemo magnetno polje Zemlje notranjega izvora. Vrtinčaste konvekcijske električne tokove v tekočem delu jedra Zemlje opišemo z magnetnim dipolom. Iz splošne rešitve Laplaceove enačbe izpeljemo izraz za magnetni potencial v okolici magnetnega dipola. Nato obravnavamo dva primera [1]. V prvem primeru predpostavimo, da os magnetnega dipola sovpada z rotacijsko osjo Zemlje in izračunamo velikost gostote magnetnega polja Zemlje. V drugem primeru velikost gostote magnetnega polja Zemlje izračunamo tako, da upoštevamo, da je os magnetnega dipola nagnjena glede na rotacijsko os Zemlje. V zadnjem delu diplomskega dela predstavimo možnosti uporabe teme diplomskega dela pri poučevanju v osnovni in srednji šoli. Predstavimo in opišemo didaktični pripomoček za prikaz magnetnega polja Zemlje, ki smo ga razvili in izdelali v okviru izdelave diplomske naloge.
Keywords:Zemlja, gostota magnetnega polja, magnetni dipolni moment, magnetni potencial
Place of publishing:Maribor
Publisher:[B. Gavez]
Year of publishing:2015
PID:20.500.12556/DKUM-47352 New window
UDC:537.67(043.2)
COBISS.SI-ID:21239048 New window
NUK URN:URN:SI:UM:DK:8A0VOPQ3
Publication date in DKUM:13.03.2015
Views:2514
Downloads:326
Metadata:XML RDF-CHPDL DC-XML DC-RDF
Categories:FNM
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Secondary language

Language:English
Title:Analysis of the physica lmodel for calculation of the Earth 's magnetic field density
Abstract:In this diploma work, we study the magnetic field of the Earth, known also as the geomagnetic field. The overall geomagnetic field consists of the geomagnetic fields of internal and external origin. The internal geomagnetic field originates from outer core of the Earth which is located between 2800 km and 5000 km below the Earth’s surface. This part of the core consists of liquid iron, nickel, and silicon along with a mixture of sulfur and oxygen. The rotation of the Earth around its rotational axis generates electric current loops in convection flows which are present in the Earth’s liquid outer core. These electric current loops are the source of the Earth’s internal geomagnetic field. The magnetic field of external origin is caused by highly energetic cosmic particles that ionize the atoms and molecules in the upper layers of the Earth's atmosphere. Horizontal currents of ionized particles are the source of Earth’s external magnetic field. In the diploma work, we examine the observatories that measure the density of Earth's magnetic field. Furthermore, we present the website of World Data Center for Geomagnetism in Kyoto in some details. We also present the only observatory that performs the measurements of the magnetic field density in Slovenia – the Sinji vrh Geomagnetic Observatory. We are focused on the study of the Earth's internal magnetic field. The electric current loops in convection flow in the liquid outer core are described as the magnetic dipole. From the general solution of Laplace's equation, the expression for magnetic potential in the surrounding of magnetic dipole is derived. Then, we analyze two different examples for which we calculate the components of Earth's magnetic field density and its inclination in Maribor. In the first example, we consider that the axis of the Earth’s magnetic dipole coincides with its rotational axis. In the second case, we take into account that the angle between both axes is about 100. In the last part of the diploma thesis, we present different possibilities of application of this subject at teaching in elementary and secondary schools. We present and describe the didactic accessory for displaying the Earth's magnetic field that we made during the writing of the diploma thesis.
Keywords:Earth, magnetic field density, magnetic dipole moment, magnetic potential.


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