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

2011 ◽  
Vol 116 (E5) ◽  
Author(s):  
Réjean Grard ◽  
Stéphanie Berthelin ◽  
Christian Béghin ◽  
Michel Hamelin ◽  
Jean-Jacques Berthelier ◽  
...  
Keyword(s):  
Electric Field ◽  
Huygens Probe

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

2008 ◽  
Vol 56 (5) ◽  
pp. 573-585 ◽  
Author(s):  
Alessio Aboudan ◽  
Giacomo Colombatti ◽  
Francesca Ferri ◽  
Francesco Angrilli
Keyword(s):  
Kalman Filtering ◽  
Huygens Probe ◽  
Atmospheric Structure

scholarly journals Observation of 2nd Schumann eigenmode on Titan's surface

2013 ◽  
Vol 3 (1) ◽  
pp. 157-192 ◽  
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.

Huygens (Probe)

2011 ◽  
pp. 773-778
Author(s):  
François Raulin
Keyword(s):  
Huygens Probe

The Huygens Probe System Design

2003 ◽  
pp. 155-189 ◽  
Author(s):  
K. C. Clausen ◽  
H. Hassan ◽  
M. Verdant ◽  
P. Couzin ◽  
G. Huttin ◽  
...  
Keyword(s):  
System Design ◽  
Huygens Probe ◽  
Probe System

scholarly journals Prediction of the Aerothermodynamic Environment of the Huygens Probe

2005 ◽  
Author(s):  
Brian Hollis ◽  
Scott Striepe ◽  
Michael Wright ◽  
Deepak Bose ◽  
Kenneth Sutton ◽  
...  
Keyword(s):  
Huygens Probe

The Huygens probe—space history in many ways

2006 ◽  
Vol 59 (1-5) ◽  
pp. 319-334 ◽  
Author(s):  
Anne Marie Schipper ◽  
Jean-Pierre Lebreton
Keyword(s):  
Huygens Probe ◽  
Space History
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