Computer Science – Sound
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008m%26ps...43.1085c&link_type=abstract
Meteoritics & Planetary Science, vol. 43, Issue 6, p.1085-1095
Computer Science
Sound
Cometary Nucleus, Remote Sensing, Spacecraft, Three Dimensional Modeling
Scientific paper
The 90 MHz radar-wave experiment, Comet Nucleus Sounding Experiment by Radiowave Transmission (CONSERT), on board the Rosetta mission (ESA, 2004) is expected to probe the nucleus of the comet 67P/Churyumov-Gerasimenko (67P/C-G) to reveal information on its physical properties, chemical composition, and internal structure. This investigation assesses the potential to recognize lithological structure in the comet nucleus with a radar experiment such as CONSERT. Radar simulations at 90 MHz were performed with a finite difference time domain (FDTD) method. The amplitude and losses of the transmitted and reflected electric field components of an incident radar pulse were evaluated as a function of time. Seven different dielectric models of sections of a hypothetical comet nucleus were used, representative of existing theories of comet nuclei. Values of dielectric constant assigned to these models are based on mixing laws for a porous mixture of ice and meteoritic dust, employing laboratory measured values of relative permittivity for mainly chondritic meteorites. Our results confirm that structural differences such as layers or inclusions are discernable from transmitted and reflected radar signals at 90 MHz, the central frequency of the CONSERT instrument. Such simulations help to constrain the ambiguities that might exist in future radar data associated with the nature of the comet nuclei, whether conglomerate or layered in nature.
Carley Ruth A.
Heggy Essam
No associations
LandOfFree
Finite difference time domain simulation of radar wave propagation through comet nuclei dielectric models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Finite difference time domain simulation of radar wave propagation through comet nuclei dielectric models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Finite difference time domain simulation of radar wave propagation through comet nuclei dielectric models will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1337120