Atmospheric Structure of the Outer Planets from Thermal Emission Data

1981 ◽  
pp. 35-56
Author(s):  
Glenn S. Orton
Keyword(s):  
Thermal Emission ◽  
Emission Data ◽  
Outer Planets ◽  
Atmospheric Structure

scholarly journals ATMOSPHERIC STRUCTURE OF THE OUTER PLANETS FROM THERMAL EMISSION DATA

1981 ◽  
Vol 96 ◽  
pp. 35-56
Author(s):  
Glenn S. Orton
Keyword(s):  
Chemical Composition ◽  
Thermal Emission ◽  
Atmospheric Temperature ◽  
Temperature Structure ◽  
Emission Data ◽  
Outer Planets ◽  
Atmospheric Structure ◽  
Stratospheric Temperature ◽  
Aerosol Absorption ◽  
Show Evidence

Determination of atmospheric temperature structure is of paramount importance to the understanding of planetary atmospheric structure. The most powerful methods for determining atmospheric structure exploit the opacities provided by the collision induced H2 dipole and the ν4 fundamental of CH4. In addition to earth-based observations, useful measurements of thermal emission from Jupiter and Saturn have been or soon will be made by several spacecraft, with results cross-checked with independent radio occultation results. For Uranus and Neptune, only a limited set of whole-disk earth-based data exists. All the outer planets show evidence for stratospheric temperature inversions; temperature minima range from about 105 K for Jupiter and 87 K for Saturn, to roughly 55 K for Uranus and Neptune. In addition to better data, remaining problems may be resolved by better quantitative understanding of gas and aerosol absorption and scattering properties, chemical composition, and non-LTE source functions. Ultimately, temperature structure results must be supplemented by quantitative energy equilibrium models which will allow some meaning to be given to the relationships between such characteristics as temperature, clouds, incident solar and planetary radiation, and chemical composition.

scholarly journals A multiwavelength study of the debris disc around 49 Cet

2019 ◽  
Vol 488 (3) ◽  
pp. 3507-3525 ◽  
Author(s):  
Nicole Pawellek ◽  
Attila Moór ◽  
Julien Milli ◽  
Ágnes Kóspál ◽  
Johan Olofsson ◽  
...  
Keyword(s):  
Thermal Emission ◽  
Scattered Light ◽  
Spectral Energy Distribution ◽  
Outer Region ◽  
Transport Processes ◽  
Spectral Energy ◽  
Distribution Fitting ◽  
Emission Data ◽  
Very Large Telescope ◽  
Radial Extent

Abstract In a multiwavelength study of thermal emission and scattered light images we analyse the dust properties and structure of the debris disc around the A1-type main-sequence star 49 Cet. As a basis for this study, we present new scattered light images of the debris disc known to possess a high amount of both dust and gas. The outer region of the disc is revealed in former coronagraphic H-band and our new Y-band images from the Very Large Telescope SPHERE instrument. We use the knowledge of the disc’s radial extent inferred from ALMA observations and the grain size distribution found by spectral energy distribution fitting to generate semidynamical dust models of the disc. We compare the models to scattered light and thermal emission data and find that a disc with a maximum surface density at 110 au and shallow edges can describe both the thermal emission and the scattered light observations. This suggests that grains close to the blow-out limit and large grains stem from the same planetesimal population and are mainly influenced by radiation pressure. The influence of inward transport processes could not be analysed in this study.

Radiometric calibration of thermal emission data from the Asteroid and Lunar Environment Chamber (ALEC)

2019 ◽  
Vol 90 (9) ◽  
pp. 093101 ◽  
Author(s):  
Michael S. Bramble ◽  
Yazhou Yang ◽  
William R. Patterson ◽  
Ralph E. Milliken ◽  
John F. Mustard ◽  
...  
Keyword(s):  
Thermal Emission ◽  
Radiometric Calibration ◽  
Emission Data ◽  
Lunar Environment ◽  
Environment Chamber

Some Physical Constants of the Lunar Surface as Indicated by its Radar Scattering and Thermal Emission Properties

1962 ◽  
Vol 14 ◽  
pp. 533-543
Author(s):  
T. B. A. Senior ◽  
K. M. Siegel ◽  
A. Giraud
Keyword(s):  
Lunar Surface ◽  
Thermal Emission ◽  
University Of Michigan ◽  
Emission Data ◽  
Physical Constants ◽  
The Past ◽  
Radar Scattering ◽  
The Subject ◽  
The University ◽  
Radiation Laboratory

The purpose of this paper is to summarize some of the results of lunar studies carried out in the Radiation Laboratory of The University of Michigan during the past 3 years. Apart from an associated program which is the subject of a later paper [1] by Fensleret al., these studies have been confined mainly to an analysis of radar scattering and thermal emission data, but in the course of this work, values have been obtained for some of the physical constants of the lunar surface.

scholarly journals MGS TES Results: Atmospheric Structure, Aerosols, and Dynamics

2002 ◽  
Vol 12 ◽  
pp. 638-641 ◽  
Author(s):  
Barney J. Conrath ◽  
John C. Pearl ◽  
Michael D. Smith ◽  
Philip R. Christensen
Keyword(s):  
Thermal Emission ◽  
Emission Spectra ◽  
Water Ice ◽  
Atmospheric Structure

AbstractThermal emission spectra from the MGS TES instrument permit retrieval of atmospheric properties that are of interest in the study of Martian meteorology, including temperature, dust, and water ice. Examples of analyses of zonal mean meridional thermal sructure for equinox and solstice conditions are presented.

The evolution of the Kuiper belt during the formation of the outer planets

1999 ◽  
Vol 173 ◽  
pp. 37-44
Author(s):  
M.D. Melita ◽  
A. Brunini
Keyword(s):  
Kuiper Belt ◽  
Outer Planets ◽  
Self Consistent ◽  
Planetary Bodies ◽  
Mass Depletion

AbstractA self-consistent study of the formation of planetary bodies beyond the orbit of Saturn and the evolution of Kuiper disks is carried out by means of an N-body code where accretion and gravitational encounters are considered. This investigation is focused on the aggregation of massive bodies in the outer planetary region and on the consequences of such process in the corresponding cometary belt. We study the link between the bombardment of massive bodies and mass depletion and eccentricity excitation.

Measurement of lattice parameter at the nanometer scale using convergent-beam microdiffraction from a thermal emission source

1993 ◽  
Vol 51 ◽  
pp. 690-691
Author(s):  
W. T. Pike
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Thermal Emission ◽  
Lattice Parameter ◽  
Scanning Transmission Electron Microscope ◽  
Emission Source ◽  
Device Structure ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Convergent Beam

With the advent of crystal growth techniques which enable device structure control at the atomic level has arrived a need to determine the crystal structure at a commensurate scale. In particular, in epitaxial lattice mismatched multilayers, it is of prime importance to know the lattice parameter, and hence strain, in individual layers in order to explain the novel electronic behavior of such structures. In this work higher order Laue zone (holz) lines in the convergent beam microdiffraction patterns from a thermal emission transmission electron microscope (TEM) have been used to measure lattice parameters to an accuracy of a few parts in a thousand from nanometer areas of material.Although the use of CBM to measure strain using a dedicated field emission scanning transmission electron microscope has already been demonstrated, the recording of the diffraction pattern at the required resolution involves specialized instrumentation. In this work, a Topcon 002B TEM with a thermal emission source with condenser-objective (CO) electron optics is used.

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