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| Titel |
Zeeman effect in atmospheric O2 measured by ground-based microwave radiometry |
| VerfasserIn |
F. Navas-Guzmán, N. Kämpfer, A. Murk, R. Larsson, S. A. Buehler, P. Eriksson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 4 ; Nr. 8, no. 4 (2015-04-23), S.1863-1874 |
| Datensatznummer |
250116304
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| Publikation (Nr.) |
 copernicus.org/amt-8-1863-2015.pdf |
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| Zusammenfassung |
| 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. |
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