New results in polarimetry of planetary thermospheric emissions: jovian case

Details New results in polarimetry of planetary thermospheric emissions: jovian case New results in polarimetry of planetary thermospheric emissions: jovian case

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p11f1633b&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P11F-1633

Other

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [5706] Planetary Sciences: Fluid Planets / Aurorae, [6220] Planetary Sciences: Solar System Objects / Jupiter

Scientific paper

Since the detection of polarization in the terrestrial oxygen red line (Lilensten et al. 2008), it has been shown that polarization can be a useful tool to monitor planetary space environments. In the case of the jovian auroral emission, a polarization in the H3+ line at 3.95μm has been measured with a degree up to 7%. Although of great importance, this result is currently difficult to interpret due to the lack of a theoretical link between the polarization and the local fields. A circular polarization has also been detected but additional measurements are needed to confirm this result. Several other jovian emission lines can also be polarized, especially the Lyman alpha line (121 nm). In auroral regions, it may carry information on the energies of the precipitating particles and on the altitude of emissions. However the measurements are often impossible to achieve from the ground and need space instrumentation on board missions or space telescope. Considering the signal to noise necessary to achieve such measurements, some technical developments are still necessary especially in the FUV. In summary, it is shown that the measurement of polarization can be a source of invaluable information to study planetary upper atmospheres and that it should not be neglected in future upper atmosphere studies.

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