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Huygens/HASI 2002 balloon test campaign: Probe trajectory and atmospheric vertical profiles reconstruction

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Title: Huygens/HASI 2002 balloon test campaign: Probe trajectory and atmospheric vertical profiles reconstruction
Authors: Gaborit, V.1 vincent.gaborit@obspm.fr, Fulchignoni, M.1, Colombatti, G.2, Ferri, F.2, Bettanini, C.2
Source: Planetary & Space Science. Aug2004, Vol. 52 Issue 9, p887-895. 9p.
Subjects: Atmosphere, Physical constants, Pressure measurement, Huygens' principle
Abstract: In the framework of the activities going on in preparation for the mission of the Huygens probe in Titan''s atmosphere (January 2005), the Huygens Atmospheric Structure Instrument (HASI) team scheduled and performed several balloon campaigns to test the HASI sensors’ performance in flight conditions in the Earth''s atmosphere. In particular, pressure conditions reached during each test are similar to those expected in Titan''s lower atmosphere. A 1:1 scaled mock-up of the Huygens probe was launched with a stratospheric balloon in 2001 (Br. Assoc. Adv. Sci. 33 (2001) 1109) and in 2002 (Br. Assoc. Adv. Sci. 34 (2002) 911; Adv. Space. Sci. (2003)) from the G. Broglio base of the Italian Space Agency, located in Trapani Milo (Sicily). In both cases the mock-up was dropped from an altitude higher than 27 and 32 km, respectively, and recovered on the ground after a parachuted descent. In this paper, we describe the results obtained in reconstructing (i) the probe descent trajectory and (ii) the profiles of the physical quantities characterizing the Earth''s atmosphere, on the basis of a complete analysis of the data obtained during the HASI 2002 balloon flight experiment. Using temperature and pressure measurements, we are able to reach an accuracy of the order of 0.5% on the altitude reconstruction during the descent. We validate both the models used for trajectory reconstruction and to check the sensors’ performance. We describe the problems faced in determining the Huygens probe descent trajectory in Titan''s atmosphere focusing our discussion on the critical aspects of the descent reconstruction (such as the uncertainties due to measurement errors, limited knowledge of the atmospheric composition, etc.) and the validity of the adopted assumptions. [Copyright &y& Elsevier]
Copyright of Planetary & Space Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Huygens/HASI 2002 balloon test campaign: Probe trajectory and atmospheric vertical profiles reconstruction
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  Data: <searchLink fieldCode="JN" term="%22Planetary+%26+Space+Science%22">Planetary & Space Science</searchLink>. Aug2004, Vol. 52 Issue 9, p887-895. 9p.
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  Data: <searchLink fieldCode="DE" term="%22Atmosphere%22">Atmosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+constants%22">Physical constants</searchLink><br /><searchLink fieldCode="DE" term="%22Pressure+measurement%22">Pressure measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Huygens'+principle%22">Huygens' principle</searchLink>
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  Data: In the framework of the activities going on in preparation for the mission of the Huygens probe in Titan''s atmosphere (January 2005), the Huygens Atmospheric Structure Instrument (HASI) team scheduled and performed several balloon campaigns to test the HASI sensors’ performance in flight conditions in the Earth''s atmosphere. In particular, pressure conditions reached during each test are similar to those expected in Titan''s lower atmosphere. A 1:1 scaled mock-up of the Huygens probe was launched with a stratospheric balloon in 2001 (Br. Assoc. Adv. Sci. 33 (2001) 1109) and in 2002 (Br. Assoc. Adv. Sci. 34 (2002) 911; Adv. Space. Sci. (2003)) from the G. Broglio base of the Italian Space Agency, located in Trapani Milo (Sicily). In both cases the mock-up was dropped from an altitude higher than 27 and <f>32 km</f>, respectively, and recovered on the ground after a parachuted descent. In this paper, we describe the results obtained in reconstructing (i) the probe descent trajectory and (ii) the profiles of the physical quantities characterizing the Earth''s atmosphere, on the basis of a complete analysis of the data obtained during the HASI 2002 balloon flight experiment. Using temperature and pressure measurements, we are able to reach an accuracy of the order of 0.5% on the altitude reconstruction during the descent. We validate both the models used for trajectory reconstruction and to check the sensors’ performance. We describe the problems faced in determining the Huygens probe descent trajectory in Titan''s atmosphere focusing our discussion on the critical aspects of the descent reconstruction (such as the uncertainties due to measurement errors, limited knowledge of the atmospheric composition, etc.) and the validity of the adopted assumptions. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
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  Group: Ab
  Data: <i>Copyright of Planetary & Space Science is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.pss.2003.10.004
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      – SubjectFull: Pressure measurement
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              Text: Aug2004
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