2.4.1 spase://CNES/Instrument/CDPP-AMDA/JASON3/AMBRE AMBRE Active Monitor Box of Electrostatic Risks 2020-09-30T21:10:13Z The AMBRE experiment onboard the ocean topography mapper JASON-3 aims at measuring the spacecraft potential as well as auroral particle precipitation using two top-hat analyzers for electrons and ions in the 20 eV–28 keV energy range. The JASON-3 spacecraft has a nearly circular orbit at an altitude of 1,336 km with an inclination of 66°, at times probing the equatorward part of the auroral oval in a nearly tangential manner upon leaving the outer radiation belt. AMBRE consists of two coupled top-hat analyzers, one for ions and the other for electrons in the 20 eV–28 keV energy range. The field of view of both spectrometers is 180° × 6° centered on the zenith. The 180° plane of view is divided into four anodes, the two central ones (sectors 2 and 3) looking at precipitating particles while the two side ones (sectors 1 and 4) record nearly trapped particles (note that the angular resolution of each anode is only ~35°). The geometries of both electron and ion analyzers are identical, except that the electron analyzer has an entrance grid with a transparency of 10% (Sauvaud and Payan, 2017). The AMBRE spectrometers provide particle spectra with 128, 32, or 16 energy steps with a time resolution that varies from 0.5 to 2 s. The geometrical factor of a single anode is 1.7 · 10−3 cm2.ster.eV/eV for ions and 1.5 · 10−4 cm2.ster.eV/eV for electrons. spase://CNES/Person/CDPP-AMDA/Denis.Payan PrincipalInvestigator spase://SMWG/Person/Jean-Andre.C.Sauvaud CoInvestigator Instrument description https://jason-3.cnes.fr/en/JASON3/index.htm Lavraud et al., AMBRE: A Compact Instrument to Measure Thermal Ions, Electrons and Electrostatic Charging Onboard Spacecraft https://ieeexplore.ieee.org/document/8788933 Sauvaud et al., Low-Altitude Observations of Recurrent Short-Lived keV Ion Microinjections Inside the Diffuse Auroral Zone https://doi.org/10.1002/2017JA025075 ElectrostaticAnalyser Active Monitor Box of Electrostatic Risks spase://CNES/Observatory/CDPP-AMDA/JASON3