Venus Ionospheric Hole Behavior in the Context of Channel Crossings

Details Venus Ionospheric Hole Behavior in the Context of Channel Crossings Venus Ionospheric Hole Behavior in the Context of Channel Crossings

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53b1513h&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P53B-1513

Physics

[2435] Ionosphere / Ionospheric Disturbances, [2437] Ionosphere / Ionospheric Dynamics, [2439] Ionosphere / Ionospheric Irregularities, [2459] Ionosphere / Planetary Ionospheres

Scientific paper

There is clearly a need to better understand the topology and physical mechanisms of the nightside ionospheric holes on Venus and the disturbed, so called “disappearing” nightside ionosphere seen under the active part of the solar cycle. . One mechanism in particular, by de-Tejada, [2004, 2006], is the channel mechanism, in which the solar wind erodes the upper ionosphere in a channel that extends to low altitudes Some features of the PVO crossings of nightside ionosphere density depressions are consistent with crossings of the Pioneer Venus Orbiter through the channels that extend downstream from the magnetic polar regions. The hole width and depth in his interpretation become broader with increasing Psw. The de-Tejada mechanism will be extended further by examining in statistical detail nightside plasma measurements of Pioneer Venus Orbiter of the structure downstream from the magnetic polar region. Data from all nightside passes will be used to construct statistical altitude profiles of the depression structures (holes or channels) as a function of magnetic latitude, local time, solar wind pressure, and IMF. The depression structures will then be compared for consistency with the expectancies of the channel mechanism.

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