Physics – Optics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p22a..03h&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P22A-03
Physics
Optics
0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707), 0350 Pressure, Density, And Temperature, 6270 Pluto And Satellites, 6900 Radio Science, 6994 Instruments And Techniques
Scientific paper
A planetary radio occultation experiment typically consists of a single tone transmitted toward a receiver as the line of sight is obscured by, or emerges from, the planet limb. Phase shifts in the tone are recorded and are attributed, in part, to the presence of a refracting atmosphere. Under the assumption of a spherically symmetric atmosphere with no ``small-scale'' structure, the Abel inversion may be applied to the phase data in order to recover an atmospheric refractivity profile. Unfortunately, being rooted in geometrical optics, the Abel inversion does not account for wave optics effects such as diffraction, which can arise from sub-Fresnel-scale structure (e.g., temperature inversions, waves, planet limb). When applied in the presence of such features, the Abel inversion produces atmospheric profiles blurred by diffractive ringing. To resolve sub-Fresnel-scale structure, more advanced inversion techniques, such as back propagation, have been developed that allow for profiles with resolutions better than the size of the first Fresnel zone - an order of magnitude better in some cases. By using multiple tones that are closely spaced in frequency, the New Horizons Radio Occultation Experiment (REX) will attempt to generate several atmospheric profiles of Pluto from a single fly-by, which includes both ingress and egress occultations. Since Pluto has a very tenuous atmosphere, it is expected that limb diffraction from each tone will dominate over any phase signature from atmospheric structure. Consequently, successful construction of atmospheric profiles for Pluto requires an inversion method that accounts for limb diffraction from not one but multiple carriers. This research presents the results of ongoing investigation into the interaction of multiple tones in radio occultation (most notably for New Horizons REX) and the effect of additional carriers upon wave optics inversion methods, i.e., back propagation. Also, various techniques for isolating each carrier, including their corresponding frequency signatures from planetary structure (diffractive and otherwise), are explored.
Han Cheongho
Tyler Glenn
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