Ionospheric Dynamics Effects on the Ionospheric Magnesium-Iron Ion Concentration Ratios

Details Ionospheric Dynamics Effects on the Ionospheric Magnesium-Iron Ion Concentration Ratios Ionospheric Dynamics Effects on the Ionospheric Magnesium-Iron Ion Concentration Ratios

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sa31a04g&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SA31A-04

Computer Science

Sound

0355 Thermosphere--Composition And Chemistry, 2415 Equatorial Ionosphere, 2423 Ionization Mechanisms, 2437 Ionospheric Dynamics, 2443 Midlatitude Ionosphere

Scientific paper

Sounding rocket and satellite ion composition measurements show that the meteoric Fe+ concentration typically exceeds that of Mg + in the main meteor ionization layer and above. This is a puzzle because the assumed source of the metal ions is the sporadic background of infalling meteoroids, which are on average chondritic in nature and hence should deposit a higher portion of Mg in the atmosphere than Fe. A more detailed investigation the ionosphere measurements revealed that the ratio varies from measurement to measurement with Mg + and Fe + often switching dominance roles, although on average Fe + dominates. Possible sources for the relative variations between the two species include differential ablation, species-dependent ion-neutral chemical processes, non-isotropic interplanetary particle populations and neutral wind and electrodynamic influences. We will discuss the observations and show that ionospheric dynamics and electrodynamic processes can play an important role.

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