EGU23-12413, updated on 14 May 2024
https://doi.org/10.5194/egusphere-egu23-12413
EGU General Assembly 2023
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Miniaturized Radiometer for an Ice Giants mission for haze and cloud characterization

Víctor Apéstigue1, Daniel Toledo1, Ignacio Arruego1, Patrick Irwin2, Pascal Rannou3, Alejandro Gonzalo1, Juan José Jiménez1, Javier Martínez-Oter1, Margarita Yela1, Mar Sorribas1, and Eduardo Sebastian1,4
Víctor Apéstigue et al.
  • 1Instituto Nacional de Técnica Aeroespacial (INTA), Torrejón de Ardoz, Madrid, Spain (apestiguepv@inta.es)
  • 2Department of Physics, University of Oxford, Parks Rd, Oxford, OX1 3PU, UK.
  • 3GSMA, UMR 7331-GSMA, Universite de Reims Champagne-Ardenne, 51687 Reims, France.
  • 4Centro de Astrobiología (CAB), CSIC-INTA, Madrid, Spain

Uranus and Neptune, the Ice Giants, are the unique planets in the Solar System that have not received a dedicated mission. However, studying these planets is crucial for understanding the formation and evolution of our planetary system and the outer systems, for which the ice planet systems are very common.

Our current knowledge comes from Earth and space telescope limited observations and from the brief encounter with the Voyager 2 spacecraft almost three decades ago. The recent decadal survey [1] has established a flag mission to Uranus as the following strategic priority for the Nasa exploration program (apart from the ongoing missions to Mars and Europa). From ESA’s perspective, the outcomes from the Voyage 2050 [2] are also in alignment, recommending the agency’s participation in a future mission in a collaboration framework, as established in previous successful partnerships like Cassini-Huygens.

Several reference missions have been proposed during the last decade [3-4], most of them suggesting an orbiter plus a descent probe configuration. For the orbiter, the scientific priorities should be to study the planet's bulk composition and internal structure, magnetic field, atmosphere circulation, rings, and satellite system. In the case of the descent probe, its primary mission should be to obtain the atmospheric noble gas abundances, noble gas isotope ratios, and the thermal structure of the atmosphere using a mass spectrometer and a meteorological package.

Understanding the thermal structure and dynamics of Uranus’ atmosphere requires studying the vertically distributed aerosols (hazes and clouds) and their microphysical and scattering properties. Indeed, aerosols affect the absorption and reflection of solar radiation, directly affecting the energy balance that drives the planet. In this work we present a lightweight radiometer, as a part of the descending probe, dedicated to studying Uranus’s aerosols. The principle of measurement is based on the vertical variation of the solar radiance at different wavelengths and geometries of observations as the probe falls using photodetectors, field-of-view masks, and interferential filters. From these observations, information on the vertical structure of clouds and hazes, particle size, or scattering properties could be derived.

The radiometer takes its heritage from previous missions for Mars exploration [7-9] where its technology has demonstrated its endurance for extreme environments of operation, using limited resources in terms of power consumption, mass and volume footprints, and data budget. These characteristics make this instrument a valuable complementary probe’s payload for studying Uranus’ atmosphere with a high scientific return.

 

[1] Origins, Worlds, and Life: A Decadal Strategy for Planetary Science and Astrobiology 2023-2032.  [2] Linda J. Tacconi, Christopher S. Arridge, et al, Voyage2050 Final recommendations from the Voyage 2050 Senior Committee. [3] Christopher S. Arridge, et al.. 2012. [4] Sushil K.AtreyaaMark, et al.,2019 [5] Ian J. Cohen et al 2022 P [6] Athul Pradeepkumar Girija.  2023 [7] I. Arruego et al. 2017. [8] Apestigue, V. et al 2022 [9] Pérez-Izquierdo, J., Sebastián et al, 2016.

How to cite: Apéstigue, V., Toledo, D., Arruego, I., Irwin, P., Rannou, P., Gonzalo, A., Jiménez, J. J., Martínez-Oter, J., Yela, M., Sorribas, M., and Sebastian, E.: Miniaturized Radiometer for an Ice Giants mission for haze and cloud characterization, EGU General Assembly 2023, Vienna, Austria, 23–28 Apr 2023, EGU23-12413, https://doi.org/10.5194/egusphere-egu23-12413, 2023.