Details

Autor(en) / Beteiligte

• Louis, C. K.
• Prangé, R.
• Lamy, L.
• Zarka, P.
• Imai, M.
• Kurth, W. S.
• Connerney, J. E. P.

Titel

Jovian Auroral Radio Sources Detected In Situ by Juno/Waves: Comparisons With Model Auroral Ovals and Simultaneous HST FUV Images

Ist Teil von

• Geophysical research letters, 2019-11, Vol.46 (21), p.11606-11614

Ort / Verlag

Washington: Blackwell Publishing Ltd

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• Since the discovery of Jovian auroral radio emissions, the question arises of the source positions of the different components (broadband kilometric, hectometric, and decametric) and their association with far ultraviolet (FUV) auroral emissions. We surveyed Juno's first 15 perijoves to track local radio sources from in situ Juno/Waves measurements (50 Hz to 40 MHz). This allowed us to study the 3‐D spatial distribution of the broadband kilometric, hectometric, and decametric radio sources. These sources are carried by the same magnetic field lines, with the bulk of them at apex M ranging from 15 to 60 (distance measured in RJ at the magnetic equator). Finally, comparisons with images of the Jovian FUV aurorae simultaneously acquired by the Hubble Space Telescope (HST) reveal a partial spatial colocation of the FUV main oval emission with the identified local radio sources. Plain Language Summary Jupiter produces auroral emission at radio and far ultraviolet (FUV) wavelengths. These emissions have been studied for more than half a century, from an equatorial point of view. The Juno spacecraft, in orbit around Jupiter since July 2016, passes above the northern and southern poles once per orbit, and thus inside the regions where the auroral radio emission occurs. Using the first 15 Juno's orbits, we found that the sources, from the kilometer to the decameter wavelengths, are all colocated. The comparison with simultaneous images on the FUV wavelengths, acquired by the Hubble Space Telescope, reveals that the source of Jovian auroral radiation at the kilometer and decameter wavelengths are magnetically connected to region of FUV emissions. Key Points The position of the sources of the broadband Kilometric, Hectometric and Decametric auroral radio emissions is statistically determined from in situ source crossings by Juno/Waves All radio sources are found to be located on the same set of magnetic field lines, with M ranging from 10 to 60, and are connected to the main UV oval Correspondence between auroral radio and ultraviolet emissions validated by simultaneous auroral observations by Juno/Waves (radio) and HST/STIS (FarUltraviolet)