Mars: Subsurface Properties from Observed Longitudinal Variation of the 3.5-mm Brightness Temperature.

Abstract

Measurements at 3.5 mm of the disk-average brightness temperature of Mars during the 1978 opposition can be represented by T sub B (Mars, 3.5 mm, Jan/Feb 1978) = 198(+ or - 1) + 10(+ or - 2) cos (CML + 10(+ or - 6) K. (The errors cited are from the internal scatter; the estimated absolute calibration uncertainty is 3%). This longitudinal variation must be taken into account if Mars is to be used as a calibration source at millimeter wavelengths. The total range of the 3.5-mm variation is three to four times larger than both the 2.8-cm and 20-micrometer variations. This unexpected result can possibly be explained by subsurface scattering from rocks < or approx. 1.5-cm. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 15, 1984
Accession Number
ADA140630

Entities

People

  • B. H. Andrew
  • B. M. Jakosky
  • E. E. Epstein
  • F. D. Palluconi
  • F. H. Briggs

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Calibration
  • Contracts
  • Data Acquisition
  • Data Analysis
  • Emissivity
  • Errors
  • Jet Propulsion
  • Measurement
  • Observation
  • Observatories
  • Roughness
  • Scattering
  • Surface Roughness
  • Surface Temperature
  • Telescopes

Fields of Study

  • Physics

Readers

  • Astronomy/Astrophysics
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Space Exploration and Orbital Mechanics.