Other
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..16...81b&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 16, no. 4, p. (4)81-(4)86
Other
11
Coronas, Energetic Particles, Ions, Magnetohydrodynamic Flow, Mars (Planet), Neutral Particles, Planetary Magnetospheres, Solar Wind, Flux (Rate), Helium, Hydrogen, Imagery, Oxygen, Particle Acceleration, Satellite-Borne Instruments
Scientific paper
Because Mars apparently has no strong intrinsic magnetic field, the solar wind plasma penetrates deep enough to interact strongly through charge-exchange processes with the extended neutral coronae (hydrogen, helium amd oxygen ones). That produces intense (105 - 106/((sq cm)(sr)(s)(keV))) fluxes of energetic (0.1-1 keV) neutral atoms (ENA) which are moving tangentially to the stream lines of the flowing solar wind. Thus, imaging these ENA can remotely and globally provide characteristics of the plasma flow in the interaction region. Transcharging of accelerated planetary ions (0.1-10 keV) results in the ENA generation inside the Martian magnetosphere. The ENA flux can reach 103 (1-10 keV)-105 (approximately 0.1 keV)/(sq cm)(sr)(s)(keV)). Detection of these neutrals is important for defining the net ionospheric outflow. Very intensive ENA flow (up to 107/((sq cm)(sr)(s)(kev))) originates in transcharging between the Martian extended and the solar wind, but due to the strong solar UV background its detection is questionable. Energetic ion population gives a rather weak ENA emission up to 5/((sq cm)(sr)(s)(keV)) for 10-30 keV. The ASPERA-C instrument on board the Mars 94 spacecraft is extended to carry out the first imaging of energetic neutrals from another planet. The instrument utilizes two different techniques to detect ENAs. Solid state detectors are used for the energy range 13-140 keV and conversion of ENA to secondary particles on a graphite target for the range 0.3-70 keV. ASPERA-C will also carry out simultaneous 3D ion measurements to study the interaction between charged particles and neutrals.
Barabash Stas
Grzedzielski Stanislav
Lundin Richard
Żarnowiecki T.
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