The far-ultraviolet main auroral emission at Jupiter – Part 2:vertical emission profile
| Autor: | B. Bonfond, J. Gustin, J.-C. Gérard, D. Grodent, A. Radioti, B. Palmaerts, S. V. Badman, K. K. Khurana, C. Tao |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Atmospheric Science
Brightness Astrophysics::Cosmology and Extragalactic Astrophysics medicine.disease_cause Advanced Camera for Surveys Spectral line Jupiter Altitude Earth and Planetary Sciences (miscellaneous) medicine Absorption (electromagnetic radiation) lcsh:Science Space Telescope Imaging Spectrograph Astrophysics::Galaxy Astrophysics Physics lcsh:QC801-809 Astronomy Geology Astronomy and Astrophysics lcsh:QC1-999 lcsh:Geophysics. Cosmic physics Space and Planetary Science Physics::Space Physics lcsh:Q Ultraviolet lcsh:Physics |
| Zdroj: | Annales Geophysicae, Vol 33, Pp 1211-1219 (2015) |
| ISSN: | 1432-0576 |
| Popis: | The aurorae at Jupiter are made up of many different features associated with a variety of generation mechanisms. The main auroral emission, also known as the main oval, is the most prominent of them as it accounts for approximately half of the total power emitted by the aurorae in the ultraviolet range. The energy of the precipitating electrons is a crucial parameter to characterize the processes at play which give rise to these auroral emissions, and the altitude of the emissions directly depends on this energy. Here we make use of far-UV (FUV) images acquired with the Advanced Camera for Surveys on board the Hubble Space Telescope and spectra acquired with the Space Telescope Imaging Spectrograph to measure the vertical profile of the main emissions. The altitude of the brightness peak as seen above the limb is ~ 400 km, which is significantly higher than the 250 km measured in the post-dusk sector by Galileo in the visible domain. However, a detailed analysis of the effect of hydrocarbon absorption, including both simulations and FUV spectral observations, indicates that FUV apparent vertical profiles should be considered with caution, as these observations are not incompatible with an emission peak located at 250 km. The analysis also calls for spectral observations to be carried out with an optimized geometry in order to remove observational ambiguities. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|