# # Program information file # PROGRAM_ID 2024B023 PROGRAM_TITLE Mid-Infrared Spectroscopic Imaging of Jupiter: Joint Measurements of Jupiter's Temperature Structure with Juno and Characterization of the Depth of Planetary-Scale Changes PROGRAM_INV1 Glenn Orton PROGRAM_INV2 Arrate Antunano PROGRAM_INV3 Leigh Fletcher PROGRAM_INV4 Thomas Greathouse PROGRAM_INV5 Rohini Giles PROGRAM_SCICAT major planets / satellites PROGRAM_ABSTRACT_BEG We propose to take advantage of a rare opportunity to determine the structure and composition of Jupiter's atmosphere over a broad vertical range using contemporaneous observations by the Juno spacecraft and TEXES. We request time near Juno's close approach ['perijove' or 'PJ'] for PJ69. The TEXES observations will cover a spectral range missing from Juno's instrument complement, providing valuable boundary conditions on temperature and composition in the upper troposphere and stratosphere not sensed by Juno's own instrument complement. Observations during this period are particularly important because Jupiter's opposition in December, 2024, will be the last opportunity to conduct joint experiments between TEXES and Juno. We propose to acquire a multi-spectral global map using TEXES at 5-18-um close to Juno's PJ69 [January 28, 2025]. During this perijove a radio occultation experiment will be conducted by Juno, providing a thermal profile of the stratosphere and upper-troposphere [1-400 mbar] with km-scale vertical resolution at a specific latitude and longitude. Our proposed data will provide context for the radio occultation experiments and will aid in the understanding of whether the occultation thermal profile is representative of the wider stratosphere. Additionally, the occultation temperature profile will allow us to break the degeneracy between temperature, aerosol, ammonia and phosphine in this very specific region. A secondary goal is to understand the 3-dimensional nature of planetary-scale changes in Jupiter's axisymmetric regions, which have undergone major changes in visible appearance and cloud opacity. The combination of TEXES and Juno Microwave Radiometer [MWR] measurements are capable of determining the sequence of changes to atmospheric properties over an unprecedented vertical range, which will test a theory in which such changes are due to the release of convective available potential energy [CAPE] involving latent heating by water condensation. PROGRAM_ABSTRACT_END