Ionospheric losses of Venus in the solar wind

Autor: Marian Lazar, R. Sabry, R. E. Tolba, Waleed M. Moslem, Reinhard Schlickeiser, S. Salem
Rok vydání: 2020
Předmět:
Technology
Atmospheric Science
010504 meteorology & atmospheric sciences
Solar wind
WAVES
Aerospace Engineering
Venus
Astronomy & Astrophysics
Noon
01 natural sciences
Ion
Engineering
Physics::Plasma Physics
0103 physical sciences
Meteorology & Atmospheric Sciences
Astrophysics::Solar and Stellar Astrophysics
Geosciences
Multidisciplinary
Engineering
Aerospace
Observational
010303 astronomy & astrophysics
0105 earth and related environmental sciences
Physics
Science & Technology
biology
Geology
Astronomy and Astrophysics
Plasma
biology.organism_classification
Venus ions loss
Charged particle
Computational physics
numerical [Modeling]
Geophysics
Atmosphere of Earth
Space and Planetary Science
Physical Sciences
Physics::Space Physics
DUSTY PLASMA EXPANSION
General Earth and Planetary Sciences
Astrophysics::Earth and Planetary Astrophysics
Ionosphere
Zdroj: Advances in Space Research. 65:129-137
ISSN: 0273-1177
Popis: The nature of ionospheric losses from Venus is of essential importance for understanding the ionosphere dynamics of this unmagnetized planet. A plausible mechanism that can explain the escape of charged particles involves the solar wind interaction with the upper atmospheric layers of Venus. The hydrodynamic approach proposed for plasma expansion in the present study comprises two populations of positive ions and the neutralizing electrons, which interact with the solar wind electrons and protons. The fluid equations describing the plasma are solved numerically using a self-similar approach. The behavior of plasma density, velocity, and electric potential, as well as their reliance upon solar wind parameters have been examined. It is found that for noon midnight sites, the oxygen ion-to-electron relative density may be the main factor to enhance the ionic loss. However, the other parameters, like hydrogen density and solar wind density and velocity seem to do not stimulate the runaway ions. For lower dawn-dusk region, the plasma are composed of hydrogen and oxygen ions as well as electrons, but for higher altitudes only hydrogen ions and electrons are encountered. All ionic densities play an important role either to reduce or boost the ionic loss. The streaming solar wind velocity has no effect on the plasma escaping for lower altitudes, but it reduces the expansion at higher altitudes.
Databáze: OpenAIRE
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