Projekt

The Moon’s influence on the Earth’s magnetic field

Udbyder

Vejleder

Sted

København og omegn

The goal of the project is to study solar and lunar geomagnetic variations in measured time series of magnetic field readings taken at magnetic observatories like Honolulu (Hawai), Hermanus (South Africa) and Kakioka (Japan). By stacking the observations according to solar time and lunar phase both contributions shall be separated and eventually their variation with season and solar activity shall be determined.

More than 95% of the geomagnetic field at Earth’s surface is created by dynamo action in the Earth’s fluid outer core; the remaining few percent are due to magnetized rocks in the Earth’s crust and due to electric currents in the Earth’s ionosphere and magnetosphere. Tidal winds in the ionosphere move a conductor (the ionospheric plasma) through the field lines of the Earth’s magnetic field, which causes electric currents in the ionosphere (“ionospheric dynamo”). These currents cause a magnetic field variation that is measured by geomagnetic stations. The tidal winds (and the corresponding currents and magnetic field variations) consist of a solar component (mainly due to thermal forcing, with heating on the dayside and cooling on the nightside, and a small contribution due to gravitational forcing by the sun) and a lunar component (which is entirely due to gravitational forcing by the moon). The solar contribution is about 20 times larger than the lunar contributions and can be directly seen in the magnetogram of individual days; the lunar contribution is only visible after stacking of data from several months or years of data.

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Kontakt

Virksomhed/organisation

DTU Space

Navn

Nils Olsen

Stilling

Professor -afdelingsleder for Geomagnetisme

Mail

nio@space.dtu.dk

Vejleder-info

Bachelor i Geofysik og Rumteknologi

Vejleder

Nils Olsen

Type

Fagprojekt

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

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Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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