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Zeeman effect in atmospheric O2 measured by ground-based microwave radiometry
Institute of Applied Physics, University of Bern.
Institute of Applied Physics, University of Bern.
Institute of Applied Physics, University of Bern.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
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2015 (English)In: Atmospheric Measurement Techniques, ISSN 1867-1381, E-ISSN 1867-8548, Vol. 8, no 4, 1863-1874 p.Article in journal (Refereed) Published
Abstract [en]

In this work we study the Zeeman effect on stratospheric O2 using ground-based microwave radiometer measurements. The interaction of the Earth magnetic field with the oxygen dipole leads to a splitting of O2 energy states, which polarizes the emission spectra. A special campaign was carried out in order to measure this effect in the oxygen emission line centered at 53.07 GHz. Both a fixed and a rotating mirror were incorporated into the TEMPERA (TEMPERature RAdiometer) in order to be able to measure under different observational angles. This new configuration allowed us to change the angle between the observational path and the Earth magnetic field direction. Moreover, a high-resolution spectrometer (1 kHz) was used in order to measure for the first time the polarization state of the radiation due to the Zeeman effect in the main isotopologue of oxygen from ground-based microwave measurements. The measured spectra showed a clear polarized signature when the observational angles were changed, evidencing the Zeeman effect in the oxygen molecule. In addition, simulations carried out with the Atmospheric Radiative Transfer Simulator (ARTS) allowed us to verify the microwave measurements showing a very good agreement between model and measurements. The results suggest some interesting new aspects for research of the upper atmosphere

Place, publisher, year, edition, pages
2015. Vol. 8, no 4, 1863-1874 p.
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-6111DOI: 10.5194/amt-8-1863-2015Local ID: 4502385d-0f63-453d-9d1f-2117467f3fb8OAI: oai:DiVA.org:ltu-6111DiVA: diva2:978988
Note
Validerad; 2015; Nivå 2; 20150512 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-10-19Bibliographically approved

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CiteExportLink to record
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