Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p33a1275d&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P33A-1275
Physics
[3304] Atmospheric Processes / Atmospheric Electricity, [3324] Atmospheric Processes / Lightning, [5405] Planetary Sciences: Solid Surface Planets / Atmospheres, [6295] Planetary Sciences: Solar System Objects / Venus
Scientific paper
For three years now, Venus Express has returned 128-Hz data rate magnetic measurements taken at periapsis. These measurements allow study of the signals that were attributed to lightning on the Pioneer Venus mission. The signals are of the same strength as those on PVO and larger than lightning-generated signals at the same frequency in the Earth’s ionosphere. The current location of periapsis is near the north pole of Venus where the magnetic field is usually horizontal, making propagation from atmosphere to ionosphere difficult. In this paper, we examine the statistical occurrence properties of the whistler-mode waves at periapsis to determine their dependence on field strength and orientation as well as altitude of the spacecraft. Preliminary results show that the signal occurrence rate has remained nearly constant over the course of the mission with little dependence on periapsis altitude.
Daniels J. T.
Russell Christopher T.
Strangeway Robert J.
Zhang Tianmeng
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