Evolution of the Huygens Probe Spin During Parachute Descent

Comment on “An analysis of VLF electric field spectra measured in Titan's atmosphere by the Huygens probe” by J. A. Morente et al.

Journal of Geophysical Research Atmospheres ◽

10.1029/2009je003555 ◽

2011 ◽

Vol 116 (E5) ◽

Cited By ~ 2

Author(s):

Réjean Grard ◽

Stéphanie Berthelin ◽

Christian Béghin ◽

Michel Hamelin ◽

Jean-Jacques Berthelier ◽

...

Keyword(s):

Electric Field ◽

Huygens Probe

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Huygens probe entry trajectory and attitude estimated simultaneously with Titan atmospheric structure by Kalman filtering

Planetary and Space Science ◽

10.1016/j.pss.2007.10.006 ◽

2008 ◽

Vol 56 (5) ◽

pp. 573-585 ◽

Cited By ~ 16

Author(s):

Alessio Aboudan ◽

Giacomo Colombatti ◽

Francesca Ferri ◽

Francesco Angrilli

Keyword(s):

Kalman Filtering ◽

Huygens Probe ◽

Atmospheric Structure

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Integrating the Cassini Orbiter, Huygens Probe, and Titan/Centaur launch vehicle

The Cassini-Huygens Visit to Saturn ◽

10.1007/978-3-319-07608-9_5 ◽

2014 ◽

pp. 139-156

Author(s):

Michael Meltzer

Keyword(s):

Launch Vehicle ◽

Huygens Probe

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The Titan Huygens Probe

The Cassini-Huygens Visit to Saturn ◽

10.1007/978-3-319-07608-9_4 ◽

2014 ◽

pp. 107-137

Author(s):

Michael Meltzer

Keyword(s):

Huygens Probe

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Observation of 2nd Schumann eigenmode on Titan's surface

Geoscientific Instrumentation Methods and Data Systems Discussions ◽

10.5194/gid-3-157-2013 ◽

2013 ◽

Vol 3 (1) ◽

pp. 157-192 ◽

Cited By ~ 1

Author(s):

C. Béghin ◽

G. Wattieaux ◽

R. Grard ◽

M. Hamelin ◽

J. P. Lebreton

Keyword(s):

Electromagnetic Waves ◽

Low Frequency ◽

Amplitude Distribution ◽

Data Conversion ◽

Schumann Resonance ◽

Huygens Probe ◽

Atmospheric Structure ◽

The Impact ◽

Space Wave ◽

Expected Signal

Abstract. This works presents the results obtained from an updated data analysis of the observations of Extremely Low Frequency (ELF) electromagnetic waves performed with the HASI-PWA (Huygens Atmospheric Structure and Permittivity, Wave and Altimetry) instrumentation after Huygens Probe landing on Titan surface in January 2005. The most significant signals observed at around 36 Hz throughout the descent in the atmosphere have been extensively analyzed for several years, and subsequently interpreted as the signature of a Schumann resonance, although the latter exhibits atypical peculiarities compared with those known on Earth. The usual depicting methods of space wave data used so far could not allow retrieving the presence of weak signals when Huygens was at rest for 32 min on Titan's surface. Whereas the expected signal seems hidden within the instrumental noise, we show that a careful statistical analysis of the amplitude distribution of the 418 spectral density samples of the 36 Hz line reveals abnormal characteristics compared to other frequencies. This behavior is shown to occur under propitious circumstances due to the characteristics of the onboard data conversion processes into digital telemetry counts, namely 8-bit dynamic after logarithm compression of the DFT (Discrete Fourier Transform) of ELF waveforms. Since this phenomenon is observed only at the frequency bin around 36 Hz, we demonstrate that the Schumann resonance, seen in the atmosphere within the same band, is still present on the surface, albeit with a much smaller amplitude compared to that measured before and a few seconds after the impact, because the electric dipole is thought to have been stabilized ten seconds later almost horizontally until the end of the measurements.

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