Zobrazeno 1 - 10
of 58
pro vyhledávání: '"William C. Knudsen"'
Publikováno v:
Journal of Geophysical Research: Space Physics. 121:7753-7770
Presented herein are measurements of the solar wind electron number density and temperature near and within the bow shock of Venus. The measurements were made by the Pioneer Venus mission Orbiter Retarding Potential Analyzer operating in its suprathe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6b6c7bc400910a848e918f85f6def93
https://doi.org/10.1002/2016ja022526
https://doi.org/10.1002/2016ja022526
Publikováno v:
Journal of Geophysical Research: Space Physics. 102:2175-2183
The purpose of the current study is to review the available and relevant experimental data in order to examine whether there is any evidence of accelerated electrons above the dayside ionosphere of Venus, where the shocked solar wind encounters the p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f600842486eeaf66e8a5dbd34371f40
https://doi.org/10.1029/95ja03246
https://doi.org/10.1029/95ja03246
Publikováno v:
Journal of Geophysical Research: Space Physics. 102:2185-2191
Analysis of orbiter retarding potential analyzer (ORPA) ion data recorded in the nightside Venus hydrogen bulge region has revealed that the temperature of the H+ ions is substantially cooler by approximately 2000°K than that of the O+ ions above 20
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ad02c0ca8d18550bf812d1c8661015ab
https://doi.org/10.1029/95ja02914
https://doi.org/10.1029/95ja02914
Publikováno v:
Journal of Geophysical Research: Space Physics. 102:2577-2583
Suprathermal electron fluxes measured in the Venus dayside ionosphere in the energy range from 20 to 50 eV are presented for different altitudes, solar zenith angle (SZA), and solar F10.7 flux. The average flux is nearly constant for SZAs between 0°
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e52a44b978b2b926f53fa108638c857
https://doi.org/10.1029/96ja03341
https://doi.org/10.1029/96ja03341
Publikováno v:
Journal of Geophysical Research: Space Physics. 102:435-438
Ion temperatures measured by the retarding potential analyzer carried aboard the Pioneer Venus Orbiter were sorted according to the ionospheric magnetic field conditions. It was found that the dayside ion temperatures measured during the first couple
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5a2263a4a7a3692d5dcb2a91e77296d3
https://doi.org/10.1029/96ja02874
https://doi.org/10.1029/96ja02874
Autor:
William C. Knudsen
Publikováno v:
Venus and Mars: Atmospheres, Ionospheres, and Solar Wind Interactions
The present characterization of the Venus ionosphere gives attention to features observed by the Pioneer Venus orbiter in situ ionospheric particle measuring instrument over an entire cycle of solar activity. A striking change is noted in the typical
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ea45e027e22a741ab2f12bca10e6115
https://doi.org/10.1029/gm066p0237
https://doi.org/10.1029/gm066p0237
Autor:
L. H. Brace, Devrie S. Intriligator, William C. Knudsen, Harry A. Taylor, F. L. Scarf, S. H. Brecht, Robert J. Strangeway
Publikováno v:
Geophysical Research Letters. 18:61-64
An unusual occurrence was recorded by Pioneer Venus Orbiter (PVO) in the Venusian ionosheath on November 10-11, 1981 (orbit 1071): more than an order of magnitude higher densities of ions and electrons were observed than have ever been measured by PV
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4482709c5a19d06f5e03e08c70fb149
https://doi.org/10.1029/90gl02671
https://doi.org/10.1029/90gl02671
Publikováno v:
Journal of Geophysical Research. 100:19579
A population of low-energy (0-250 V E/q) ions with tailward directed velocity vectors and energies above that for escape from Venus is evident in nightside data from the Ames plasma analyzer on the Pioneer Venus Orbiter spacecraft. Good correlations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47461b021007b6f30a97198d1b8682e7
https://doi.org/10.1029/95ja01342
https://doi.org/10.1029/95ja01342
Autor:
Robert J. Strangeway, Wayne Kasprzak, J. M. Grebowsky, Devrie S. Intriligator, L. H. Brace, Richard E. Hartle, William C. Knudsen, Paul A. Cloutier
Publikováno v:
Journal of Geophysical Research. 99:17413
We present analyses from the five Pioneer Venus Orbiter plasma experiments and the plasma wave experiment when a patch of plasma with enhanced densities was encountered in the near-Venus ionotail during atmospheric entry at an altitude of approximate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0531b00692b12a75ca9d2f3ac04e5d15
https://doi.org/10.1029/94ja01341
https://doi.org/10.1029/94ja01341
Autor:
William C. Knudsen
Publikováno v:
Journal of Geophysical Research. 97:13767
The effect of finite grid radius and thickness on the electron current measured by planar retarding potential analyzers (RPAs) is analyzed numerically. Depending on the plasma environment, the current is significantly reduced below that which is calc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::73e7a399cb1af05e9fe8257594996ed1
https://doi.org/10.1029/92ja00642
https://doi.org/10.1029/92ja00642