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Geoscientific Instrumentation, Methods and Data Systems An interactive open-access journal of the European Geosciences Union

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Geosci. Instrum. Method. Data Syst., 3, 49-58, 2014
https://doi.org/10.5194/gi-3-49-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
23 Apr 2014
In-flight calibration of the Hot Ion Analyser on board Cluster
A. Blagau1, I. Dandouras2,3, A. Barthe2,3,4, S. Brunato2,3,5, G. Facskó6,7,8, and V. Constantinescu1 1Institute for Space Sciences, Bucharest, Romania
2Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse, Toulouse, France
3CNRS, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France
4AKKA Technologies, Toulouse, France
5Noveltis, Toulouse, France
6Laboratoire de Physique et Chimie de l'Environnement et de l'Espace, Orléans, France
7Geodetic and Geophysical Institute, Research Centre for Astronomy and Earth Sciences, HAS, Sopron, Hungary
8now at: Finnish Meteorological Institute, Helsinki, Finland
Abstract. The Hot Ion Analyser (HIA), part of the Cluster Ion Spectrometry experiment, has the objective to measure the three-dimensional velocity distributions of ions. Due to a variety of factors (exposure to radiation, detector fatigue and aging, changes in the operating parameters, etc.), the particles' detection efficiency changes over time, prompting for continuous in-flight calibration. This is achieved by comparing the HIA data with the data provided by the WHISPER (Waves of HIgh frequency and Sounder for Probing of Electron density by Relaxation) experiment on magnetosheath intervals, for the high-sensitivity section of the instrument, or solar wind intervals, for the low-sensitivity section. The paper presents in detail the in-flight calibration methodology, reports on the work carried out for calibrating HIA and discusses plans to extend this activity in order to ensure the instrument's highest data accuracy.

Citation: Blagau, A., Dandouras, I., Barthe, A., Brunato, S., Facskó, G., and Constantinescu, V.: In-flight calibration of the Hot Ion Analyser on board Cluster, Geosci. Instrum. Method. Data Syst., 3, 49-58, https://doi.org/10.5194/gi-3-49-2014, 2014.
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