Computer Science – Sound
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusm.p31a..01f&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #P31A-01
Computer Science
Sound
5435 Ionospheres (2459), 5440 Magnetic Fields And Magnetism, 5443 Magnetospheres (2756), 6225 Mars, 6295 Venus
Scientific paper
The European Space Agency (ESA) currently operates spacecraft at both Mars (Mars Express - MEx) and at Venus (Venus Express - VEx). On both MEx and VEx is the Analyzer of Space Plasmas and Energetic Atoms (ASPERA) experiment, which measures the electron spectrum with the Electron Spectrometer (ELS) and the ion spectrum with the Ion Mass Analyzer (IMA). The MEx spacecraft also contains the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) which can derive the thermal electron density and magnetic field magnitude from its ionograms. The VEx spacecraft also contains a magnetometer (MAG) experiment. At the top of the ionosphere of Mars and Venus is a region where there is mixing between plasma from the ionosphere and plasma from the solar wind. ASPERA-3 data shows high energy strahl from the solar wind penetrating through the bow shock and magnetosheath, and into the dayside ionosphere. At the same time, plasma showing electron peaks generated by the ionization of carbon dioxide and atomic oxygen by solar He 30.4 nm penetrates into the magnetosheath. This overlap region is located where the thermal electron density at Mars derived by MARSIS decreases. This region marks the beginning of ion acceleration as ions begin to flow down the tail. This region is also observed at Venus. All three experiments show turbulence near and through the ionosphere/solar wind interaction region. In this presentation we will show examples of this transition region from both Mars and Venus.
Coates Andrew J.
Delva Magda
Duru Firdevs
Frahm Rudy A.
Gurnett Donald A.
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