Pioneer Venus Orbiter Electron Temperature Probe

Krehbiel, J. P.; Brace, L. H.; Theis, R. F.; Cutler, James R.; Pinkus, W. H.; Kaplan, R. W.

doi:10.1109/tgrs.1980.350260

Cited by 77 publications

(35 citation statements)

References 8 publications

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“…At Venus, NASA's Pioneer Venus Orbiter (PVO) carried the Orbiter Electron Temperature Probe (OETP) instrument (Brace et al, 1979;Krehbiel et al, 1980), which measured n e and T e throughout the Venusian ionosphere between 1978 and 1992. At Venus, NASA's Pioneer Venus Orbiter (PVO) carried the Orbiter Electron Temperature Probe (OETP) instrument (Brace et al, 1979;Krehbiel et al, 1980), which measured n e and T e throughout the Venusian ionosphere between 1978 and 1992.…”

Section: Mapping the Ionospheres Of Venus And Marsmentioning

confidence: 99%

Ionospheric Ambipolar Electric Fields of Mars and Venus: Comparisons Between Theoretical Predictions and Direct Observations of the Electric Potential Drop

Collinson

Glocer

et al. 2019

Geophysical Research Letters

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We test the hypothesis that their dominant driver of a planetary ambipolar electric field is the ionospheric electron pressure gradient (∇Pe). The ionospheres of Venus and Mars are mapped using Langmuir probe measurements from NASA's Pioneer Venus Orbiter (PVO) and Mars Atmosphere and Volatile EvolutioN (MAVEN) missions. We then determine the component of the ionospheric potential drop that can be explained by the electron pressure gradient drop along a simple draped field line. At Mars, this calculation is consistent with the mean potential drops measured statistically by MAVEN. However, at Venus, contrary to our current understanding, the thermal electron pressure gradient alone cannot explain Venus' strong ambipolar field. These results strongly motivate a return to Venus with a comprehensive plasmas and fields package, similar to that on MAVEN, to investigate the physics of atmospheric escape at Earth's closest analog.

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Section: Mapping the Ionospheres Of Venus And Marsmentioning

confidence: 99%

Ionospheric Ambipolar Electric Fields of Mars and Venus: Comparisons Between Theoretical Predictions and Direct Observations of the Electric Potential Drop

Collinson

Glocer

et al. 2019

Geophysical Research Letters

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“…When the OML is valid, the ratio of the probe radius to Debye length is so small that the shielding becomes unimportant; at this limit, the number of electrons absorbed by the probe is determined by energy and angular momentum only [11]. The Orbital-MotionLimit theory has originally developed by assuming that the plasma is collisionless, isotropic, there is no external magnetic field and the surface properties of the probe are homogeneous.…”

Section: The Orbital Motion Limit Theorymentioning

confidence: 99%

Theoretical Study of Spherical Langmuir Probe in Maxwellian Plasma

Bhattarai¹,

Mishra²

2017

IJP

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The Langmuir Probe is the key plasma diagnostic used by scientists interested in plasma characterization to measure the internal parameters of the bulk of the plasma. Spherical Langmuir Probes have been installed on satellites and sounding rockets to observe the general characteristics of thermal plasma in the ionosphere for more than five decades. Because of its simplicity and convenience, the Langmuir probe is one of the most frequently installed scientific instruments on spacecraft. This research explores the theoretical study of Spherical Langmuir Probe I-V Characteristics. With the help of the (volt-ampere curves) of spherical Langmuir probes, the different parameters of plasma can be determined such as plasma potential, floating potential, probe currents in different probe voltage and so on. The effect of electron temperature on the Electron Energy Distribution Function (EEDF) was also analyzed. At higher energy range, the shape of the distribution recovers and the tail trend with energy is maintained and decreases exponentially.

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“…Although the launching cost would still be expensive, the cost could be shared among countries that would like to increase our knowledge of space, and to contribute to human society by study of the ionosphere/ plasmasphere (Oyama et al 2010). DC probes might be carried in orbiters of other planets, as planetary exploration evolves (Krehbiel et al 1980). The experience we have acquired in earth orbiting satellites surely constitutes a foundation for successful planetary missions.…”

Section: Toward the Futurementioning

confidence: 99%

DC Langmuir Probe for Measurement of Space Plasma: A Brief Review

Oyama¹

2015

Journal of Astronomy and Space Sciences

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Pioneer Venus Orbiter Electron Temperature Probe

Cited by 77 publications

References 8 publications

Ionospheric Ambipolar Electric Fields of Mars and Venus: Comparisons Between Theoretical Predictions and Direct Observations of the Electric Potential Drop

Ionospheric Ambipolar Electric Fields of Mars and Venus: Comparisons Between Theoretical Predictions and Direct Observations of the Electric Potential Drop

Theoretical Study of Spherical Langmuir Probe in Maxwellian Plasma

DC Langmuir Probe for Measurement of Space Plasma: A Brief Review

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