Zeeman effect in atmospheric O₂ measured by ground-based microwave radiometry

Navas Guzman, Francisco Jesus; Kämpfer, Niklaus; Murk, Axel; Larsson, R.; Buehler, S. A.; Eriksson, P. (2015). Zeeman effect in atmospheric O₂ measured by ground-based microwave radiometry. Atmospheric Measurement Techniques (AMT), 8(4), pp. 1863-1874. Copernicus Publications 10.5194/amt-8-1863-2015

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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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Microwaves

UniBE Contributor:

Navas Guzman, Francisco Jesus; Kämpfer, Niklaus and Murk, Axel

Subjects:

500 Science
500 Science > 530 Physics
600 Technology > 620 Engineering

ISSN:

1867-1381

Publisher:

Copernicus Publications

Language:

English

Submitter:

Martin Frenz-Lips

Date Deposited:

15 Jan 2016 14:58

Last Modified:

06 Jul 2016 20:56

Publisher DOI:

10.5194/amt-8-1863-2015

BORIS DOI:

10.7892/boris.74986

URI:

https://boris.unibe.ch/id/eprint/74986

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