Laser Investigation of the Mesospheric Magnetic Field in the Auroral Zone

Johnson, Magnar G.; Gulbrandsen, Njål; Denman, Craig A.; Hillman, Paul D.; Matzka, J.; Hoppe, Ulf-Peter

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Laser Investigation of the Mesospheric Magnetic Field in the Auroral Zone

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Johnson, Magnar G.
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Gulbrandsen, Njål
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Denman, Craig A.
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Hillman, Paul D.
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Matzka, J.
2.3 Geomagnetism, 2.0 Geophysics, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Hoppe, Ulf-Peter
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https://meetingorganizer.copernicus.org/EGU2019/EGU2019-4905.pdf
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Zitation

Johnson, M. G., Gulbrandsen, N., Denman, C. A., Hillman, P. D., Matzka, J., Hoppe, U.-P. (2019): Laser Investigation of the Mesospheric Magnetic Field in the Auroral Zone, (Geophysical Research Abstracts Vol. 21, EGU2019-4905, 2019), General Assembly European Geosciences Union (Vienna 2019).

Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_4161900

Zusammenfassung

By means of laser optical pumping and Larmor-resonance detection, it is possible to use the naturally occurringsodium layer in the mesosphere to measure Earth’s scalar magnetic field at∼90 km above ground. This is analtitude otherwise only accessible by rockets, which only will provide point measurements of very short timescales.During the winter of 2018-19 we have installed a cw sum-frequency laser for probing the sodium-atom Larmorresonance at the Artic Lidar Observatory for Mesospheric Research (ALOMAR) at Andøya in northern Norway,to measure and monitor the magnetic field in-situ in the high latitude mesosphere over longer time scales. Thetechnique, which has been proved earlier at mid-latitudes, will in our project be applied to high latitudes in theauroral zone. This opens for a completely new domain of measurements of externally generated geomagneticvariations related to currents in the magnetosphere-ionosphere system.Here we report on the instrumental setup and present initial measurements of the mesospheric magnetic field.Furthermore, we discuss future improvements and plans.