Výsledky vyhledávání - "W. C. KNUDSEN"

Suprathermal electron fluxes in the Venus nightside ionosphere at moderate and high solar activity

Autor: K. Spenner, W. Lotze, W. C. Knudsen

Suprathermal electron fluxes up to energies of 50 eV measured at moderate solar activity (MSA) during the Pioneer Venus Orbiter entry mission are presented and compared with measurements made during high solar activity (HSA). The median height profil

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb54c808bcd17c86331371d0fb31f175
https://publica.fraunhofer.de/handle/publica/189151

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Ion density, temperature, and composition of the Venus nightside ionosphere during a period of moderate solar activity: Implications for maintaining the central nightside

Autor: W. Lotze, K. Spenner, W. C. Knudsen

Publikováno v: Journal of Geophysical Research. 100:14499

Ion density, temperature, and the partial densities of the main constituents of the Venusian nightside ionosphere during moderate solar activity are presented. The data were measured by the retarding potential analyzer of the Pioneer Venus Orbiter du

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1e8d683c62210c0f3e40b4863764475
https://doi.org/10.1029/95ja01470

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Magnetospheric convection and the high-latitudeF2ionosphere

Autor: W. C. Knudsen

Publikováno v: Journal of Geophysical Research. 79:1046-1055

Behavior of the polar ionospheric F layer as it is convected through the cleft, over the polar cap, and through the nightside F layer trough zone is investigated. Passage through the cleft adds approximately 200,000 ions per cu cm in the vicinity of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::407e7e5522b86819c01bccba77aed349
https://doi.org/10.1029/ja079i007p01046

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Simple models of the thermal structure of the Venusian ionosphere

Autor: W. C. Knudsen, Robert C. Whitten

Publikováno v: Icarus. 44:85-92

Analytical and numerical models of plasma temperatures in the Venusian ionosphere are proposed. The magnitudes of plasma thermal parameters are calculated using thermal-structure data obtained by the Pioneer Venus Orbiter. The simple models are found

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::22e119a28287125c327161256b9d23f2
https://doi.org/10.1016/0019-1035(80)90057-3

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Numerical model of the convectingF2ionosphere at high latitudes

Autor: W. C. Knudsen, D. M. Klumpar, P. M. Banks, J. D. Winningham

Publikováno v: Journal of Geophysical Research. 82:4784-4792

In previous work Knudsen (1974) presented a model for the convection field of the high latitude F layer and evaluated the time-dependent behavior of a tube of F layer plasma carried around the polar regions by the field. The present paper describes t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6258cfcee1a9509983e3a98e01ed7ec1
https://doi.org/10.1029/ja082i029p04784

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Thermal structure of the Venus ionosphere: A two-dimensional model study

Autor: R. P. Singhal, W. C. Knudsen, Robert C. Whitten

Publikováno v: Geophysical Research Letters. 13:10-13

A simple, two-dimensional, spectral model of heat transport in the Venus ionosphere has been constructed. Numerical experiments with the model suggest that a nocturnal heat source about an order of magnitude smaller than the daytime source is require

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::baeb345f4e41f0661f329198ed70ae7f
https://doi.org/10.1029/gl013i001p00010

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Molecular ion concentration around a dawn-dusk auroral-zone satellite orbit

Autor: W. C. Knudsen, G. W. Sharp

Publikováno v: Journal of Geophysical Research. 72:1941-1949

Molecular ion concentration n(O2+ + NO+) has been obtained from a curve-fitting technique applied to characteristic curves of a retarding potential analyzer carried on an oriented satellite for four days in April 1962. Data were obtained continuously

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d916c532c42646fe3a29ee2687c5a12f
https://doi.org/10.1029/jz072i007p01941

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Equations on fluid flow through porous media-Incompressible fluid of varying density

Autor: W. C. Knudsen

Publikováno v: Journal of Geophysical Research. 67:733-737

The equations governing the flow of fluid through porous media are derived for those situations in which the fluid may be considered incompressible but continuously varying in density. The equations are used to obtain an analytic solution for the ins

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4bacaa88d0f8bcbef7d78a3d5541ad0d
https://doi.org/10.1029/jz067i002p00733

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Evaluation and demonstration of the use of retarding potential analyzers for measuring several ionospheric quantities

Autor: W. C. Knudsen

Publikováno v: Journal of Geophysical Research. 71:4669-4678

The use of a plane-gridded retarding potential analyzer (planar ion trap) for measuring dominant constituent ion concentrations, ion temperature, and instrument potential in planetary ionospheres is analyzed. An example of its use for measuring these

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::84ac5885812408e4d983530b9f51faa9
https://doi.org/10.1029/jz071i019p04669

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