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Ann. Geophys., 23, 2757-2774, 2005
www.ann-geophys.net/23/2757/2005/
© European Geosciences Union 2005
The HIA instrument on board the Tan Ce 1 Double Star near-equatorial spacecraft and its first results
H. Rème1, I. Dandouras1, C. Aoustin1, J. M. Bosqued1, J. A. Sauvaud1, C. Vallat1, P. Escoubet2, J. B. Cao3, J. Shi3, M. B. Bavassano-Cattaneo4, G. K. Parks5, C. W. Carlson5, Z. Pu6, B. Klecker7, E. Moebius8, L. Kistler8, A. Korth9, R. Lundin10, and the HIA team
1Centre d’Etude Spatiale des Rayonnements (CESR), Toulouse, France
2European Space Research and Technology Center (ESTEC), ESA, The Netherland
3Center for Space Science and Applied Research (CSSAR), Beijing, China
4Istituto di Fisica dello Spazio Interplanetario (IFSI), Roma, Italy
5Space Sciences Laboratory (SSL), Berkeley, USA
6Peking University, Beijing, China
7Max-Planck-Institut für extraterrestrische Physik (MPE), Garching, Germany
8University of New Hampshire (UNH), Durham, USA
9Max Planck Institute for Solar System Research (MPS), Lindau, Germany
10Swedish Institute of Space Physics (IRF), Kiruna, Sweden
Abstract. On 29 December 2003, the Chinese spacecraft Tan Ce 1 (TC-1), the first
component of the Double Star mission, was successfully launched within a
low-latitude eccentric orbit. In the framework of the scientific cooperation
between the Academy of Sciences of China and ESA, several European
instruments, identical to those developed for the Cluster spacecraft, were
installed on board this spacecraft.
The HIA (Hot Ion Analyzer) instrument on board the TC-1 spacecraft is an ion
spectrometer nearly identical to the HIA sensor of the CIS instrument
on board the 4 Cluster spacecraft. This instrument has been specially
adapted for TC-1. It measures the 3-D distribution functions of the ions
between 5 eV/q and 32 keV/q without mass discrimination.
TC-1 is like a fifth Cluster spacecraft to study the interaction of the
solar wind with the magnetosphere and to study geomagnetic storms and
magnetospheric substorms in the near equatorial plane.
HIA was commissioned in February 2004. Due to the 2 RE higher apogee
than expected, some in-flight improvements were needed in order to use HIA in
the solar wind in the initial phase of the mission. Since this period HIA
has obtained very good measurements in the solar wind, the magnetosheath,
the dayside and nightside plasma sheet, the ring current and the radiation
belts. We present here the first results in the different regions of the
magnetosphere and in the solar wind. Some of them are very new and include,
for example, ion dispersion structures in the bow shock and ion beams close
to the magnetopause. The huge interest in the orbit of TC-1 is strongly
demonstrated.
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