Schmider, F. X., Appourchaux, T., Gaulme, P., Guillot, T., Sato, B., Murphy, N., Daban, J. B., Gay, J., Soulat, L., Baudin, F., Boumier, P., Ollivier, M., Bordé. P., Jackiewicz, J., Ida, S., Showman, A. P., Jain, K., Tripathy, S. C., Hill, F., Leibacher, J. W., and Pevtsov, A. A. 2013. "The JOVIAL Project for Jovian Seismology." In , , 119.
Jovian seismology is a unique tool to determine the internal structure of the giant planet. It could uncover the size and mass of the core, if any, the existence of a "plasma phase transition" between the molecular and the metallic hydrogen envelope, reveal the internal dynamic, and more generally address the formation and evolution of giant planets in the solar system giving a point of comparison for extra solar planets. Jovian seismology requires special observing tool. SYMPA (Schmider et al. 2007; Gaulme et al. 2008) was the first project specially designed for those objectives. A new type of instrument, a Doppler Imager, had been developed. The project permitted for the first time the measurement of the fundamental acoustic frequency of Jupiter (Gaulme et al. 2011). It also validated the principle of the instrument. However, several limitations appeared during the observations. The main one was the poor temporal coverage. A new version of the Doppler Spectro Imager (DSI) has been studied extensively in the framework of the development of a space instrument for the JUICE mission. A prototype of this new device is presently developed in the laboratory (Soulat et al. 2011) and shows excellent sensitivity and stability. It will be tested on the sky in January 2014. The JOVIAL project foresees the installation of three similar instruments on three telescopes around the Earth (Japan, France, and USA) that will provide the necessary continuity in the observations. We expect to observe winds in the Jovian atmosphere with a precision better than 2 m/s and to detect modes with amplitude as low as 5 cm/s up to the degree ℓ = 10 at least. The main objective of the project is the detection of the Jovian core.