Spatial and temporal variations of the ion velocity measured in the venus ionosphere

K. L. Miller; W. C. Knudsen

doi:10.1016/0273-1177(87)90207-9

Spatial and temporal variations of the ion velocity measured in the venus ionosphere

K. L. Miller, W. C. Knudsen

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Abstract

The average velocity of the Venus ionosphere is nightward and approximately symmetric about the sun-Venus axis. We report here on temporal and spatial deviations from this average flow and their effects on the ionosphere. Temporal variability of the ion flux affects the main ionization source on the nightside. The influence of the solar wind is seen in the correlation between nightside ion density and ionopause height. Spatial asymmetries include a low-altitude superrotation (v-dawn < v-dusk) component related to superrotation of the neutral atmosphere, and a high-altitude prograde (v-dawn > v-dusk) component that is shown to be the result of asymmetric pressure gradients on the dayside.

Original language	English
Pages (from-to)	107-110
Number of pages	4
Journal	Advances in Space Research
Volume	7
Issue number	12
DOIs	https://doi.org/10.1016/0273-1177(87)90207-9
State	Published - 1987

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@article{86cbc5ae3de746c089b4d6e6d9eb5295,

title = "Spatial and temporal variations of the ion velocity measured in the venus ionosphere",

abstract = "The average velocity of the Venus ionosphere is nightward and approximately symmetric about the sun-Venus axis. We report here on temporal and spatial deviations from this average flow and their effects on the ionosphere. Temporal variability of the ion flux affects the main ionization source on the nightside. The influence of the solar wind is seen in the correlation between nightside ion density and ionopause height. Spatial asymmetries include a low-altitude superrotation (v-dawn < v-dusk) component related to superrotation of the neutral atmosphere, and a high-altitude prograde (v-dawn > v-dusk) component that is shown to be the result of asymmetric pressure gradients on the dayside.",

author = "Miller, {K. L.} and Knudsen, {W. C.}",

note = "Funding Information: Acknowledgments. Support for K.L. Miller was provided by NASA Contract NAGW—689 and Lockheed independent research funds, and for W.C. Knudsen by NASA Contracts NAS2—11937, NAS2—948l and NAS2—12374.",

year = "1987",

doi = "10.1016/0273-1177(87)90207-9",

language = "English",

volume = "7",

pages = "107--110",

journal = "Advances in Space Research",

issn = "0273-1177",

number = "12",

}

TY - JOUR

T1 - Spatial and temporal variations of the ion velocity measured in the venus ionosphere

AU - Miller, K. L.

AU - Knudsen, W. C.

N1 - Funding Information: Acknowledgments. Support for K.L. Miller was provided by NASA Contract NAGW—689 and Lockheed independent research funds, and for W.C. Knudsen by NASA Contracts NAS2—11937, NAS2—948l and NAS2—12374.

PY - 1987

Y1 - 1987

N2 - The average velocity of the Venus ionosphere is nightward and approximately symmetric about the sun-Venus axis. We report here on temporal and spatial deviations from this average flow and their effects on the ionosphere. Temporal variability of the ion flux affects the main ionization source on the nightside. The influence of the solar wind is seen in the correlation between nightside ion density and ionopause height. Spatial asymmetries include a low-altitude superrotation (v-dawn < v-dusk) component related to superrotation of the neutral atmosphere, and a high-altitude prograde (v-dawn > v-dusk) component that is shown to be the result of asymmetric pressure gradients on the dayside.

AB - The average velocity of the Venus ionosphere is nightward and approximately symmetric about the sun-Venus axis. We report here on temporal and spatial deviations from this average flow and their effects on the ionosphere. Temporal variability of the ion flux affects the main ionization source on the nightside. The influence of the solar wind is seen in the correlation between nightside ion density and ionopause height. Spatial asymmetries include a low-altitude superrotation (v-dawn < v-dusk) component related to superrotation of the neutral atmosphere, and a high-altitude prograde (v-dawn > v-dusk) component that is shown to be the result of asymmetric pressure gradients on the dayside.

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U2 - 10.1016/0273-1177(87)90207-9

DO - 10.1016/0273-1177(87)90207-9

M3 - Article

AN - SCOPUS:38249035975

SN - 0273-1177

VL - 7

SP - 107

EP - 110

JO - Advances in Space Research

JF - Advances in Space Research

IS - 12

ER -

Spatial and temporal variations of the ion velocity measured in the venus ionosphere

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