Calibration of MAJIS (Moons And Jupiter Imaging Spectrometer): III. Spectral Calibration
arxiv(2024)
Abstract
The Moons And Jupiter Imaging Spectrometer (MAJIS) is the visible and
near-infrared imaging spectrometer onboard ESA s Jupiter Icy Moons Explorer
(JUICE) mission. Before its integration into the spacecraft, the instrument
undergoes an extensive ground calibration to establish its baseline
performances. This process prepares the imaging spectrometer for flight
operations by characterizing the behavior of the instrument under various
operative conditions and uncovering instrumental distortions that may depend on
instrumental commands. Two steps of the on-ground calibration campaigns were
held at the instrument level to produce the data. Additional in-flight
measurements have recently been obtained after launch during the Near-Earth
Commissioning Phase. In this article, we present the analyses of these
datasets, focusing on the characterization of the spectral performances. First,
we describe and analyze the spectral calibration datasets obtained using both
monochromatic sources and polychromatic sources coupled with solid and gas
samples. Then, we derive the spectral sampling and the spectral response
function over the entire field of view. These spectral characteristics are
quantified for various operational parameters of MAJIS, such as temperature and
spectral binning. The derived on-ground performances are then compared with
in-flight measurements obtained after launch and presented in the framework of
the MAJIS performance requirements.
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