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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 8 | Copyright

Special issue: Double Star - First Results

Ann. Geophys., 23, 2825-2849, 2005
https://doi.org/10.5194/angeo-23-2825-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Nov 2005

08 Nov 2005

The NUADU experiment on TC-2 and the first Energetic Neutral Atom (ENA) images recorded by this instrument

S. McKenna-Lawlor1, L. Li2, S. Barabash3, K. Kudela4, J. Balaz1, I. Strharsky1, K. Brinkfeldt3, H. Gunell3,1, C. Shen2, J. Shi2, J.-B. Cao2, Q. Zong2, S-Y. Fu5, E. C. Roelof6, P. C. Brandt6, and I. Dandouras7 S. McKenna-Lawlor et al.
  • 1Space Technology Ireland, National University of Ireland, Maynooth, Co. Kildare, Ireland
  • 2Centre for Space Science and Applied Research of the Chinese Academy of Sciences, Beijing, China
  • 3Swedish Institute of Space Physics, Kiruna, Sweden
  • 4Institute of Experimental Physics, Kosice, Slovakia
  • 5School of Earth and Space Sciences, Peking University, Beijing, China
  • 6The Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland, USA
  • 7Centre d’Etude Spatiale des Rayonnements, Toulouse, France

Abstract. The Earth’s ring current and how it responds to varying interplanetary conditions is described and an account provided of the production of Energetic Neutral Atoms (ENAs) in the geo-corona. Also, the potential to remotely monitor, on a global scale, the temporal and spatial evolution of magnetospheric plasma populations through analysing ENA images recorded during magnetic storms/substorms is indicated. A technical account of the Energetic NeUtral Atom Detector Unit NUADU aboard China’s TC-2 mission (measurement range 45–>158 keV) follows, together with an account of the scientific objectives of NUADU, both in stand-alone mode and in the context of multi-point imaging. Low altitude ENA emissions recorded by NUADU during south polar passages of TC-2 at the time of a moderate magnetic storm in September 2004, as well as bright ring current emissions recorded in November 2004 during a major geomagnetic storm, are presented and discussed in the context of various, accompanying, terrestrial disturbances. Also, ENA observations of the November 2004 ring current imaged simultaneously by TC-2/NUADU and by IMAGE/ HENA (viewing, respectively, from the Northern and Southern Hemispheres), are compared.

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