The Georgia Tech millimeter‐wavelength measurement system and some applications to the study of planetary atmospheres

Devaraj, Kiruthika; Steffes, Paul G.

doi:10.1029/2010rs004433

Cited by 5 publications

(1 citation statement)

References 41 publications

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“…The initial observations of Venus were in visible spectra and had the popular assumption about the planet being similar to Earth. The mm/sub-mm wavelength observations are ideal for probing the planetary middle and upper troposphere (Devaraj & Steffes 2011). These have been used to study the Sulfur bearing molecules which affect the thermodynamics of the Venusian atmosphere (Butler et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Polarization and brightness temperature observations of Venus with the GMRT

Mohan

Pillai

Swarup

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Venus was observed at frequencies of 1297.67 MHz (23 cm), 607.67 MHz (49 cm) and 233.67 MHz (1.28 m) with the Giant Metrewave Radio Telescope (GMRT) during the period of 25th July and 6th September 2015 when it was close to its inferior conjunction. Values of the brightness temperature (T b ) of Venus from these observations were derived as 622±43 K, 554±38 K for 1297.67 and 607.67 MHz frequencies, respectively, are in agreement with the previous observations. The attempt to derive the T b at 233.67 MHz affirms an upper limit of 321 K which is significantly lower than the previously reported upper limit of 426 K at the same frequency. We also present the dielectric constant (ε) values of the Venus surface estimated using the degree of polarisation maps of Venus, derived from the GMRT polarisation observations and theoretical calculations. The ε of the Venus surface was estimated to be ∼4.5 at both the 607.67 MHz and 1297.67 MHz, close to the reported values of ε of 4 to 4.5 from the radar-based observations including the Magellan observations at 2.38 GHz (12.6 cm). Mayer et al. (1958) pioneered the microwave probing of the Venus disk at 3.15 cm wavelength and reported an unex-

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Section: Introductionmentioning

confidence: 99%