EISCAT measurements of ion temperatures which indicate nonisotropic ion-velocity distributions

Details EISCAT measurements of ion temperatures which indicate nonisotropic ion-velocity distributions EISCAT measurements of ion temperatures which indicate nonisotropic ion-velocity distributions

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..531p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, June-July 1984, p. 531-543.

Computer Science

Sound

49

Eiscat Radar System (Europe), Ion Temperature, Ionospheric Sounding, Radio Probing, Anisotropic Media, Electric Field Strength, Multistatic Radar, Propagation Velocity, Velocity Distribution

Scientific paper

Substantial increases of the ion temperature can be observed at high latitudes as a consequence of strong convection electric fields. EISCAT measurements of three independent components of the ion velocity vector and temperature in the same scattering volume at about 300 km are reported. During periods of strong variations in ion velocity (consequently of the E-field), the ion temperatures derived at the 3 sites are different. This difference, which appears to be systematic for the two experiments studied, can be interpreted in terms of different ion temperature perpendicular and parallel to the magnetic field. Assuming that a bi-Maxwellian distribution is present for convection electric field strengths as large as 50 m V/m, an anisotropy factor of approximately 1.5 is obtained. It also appears that resonant charge exchange is the dominant collision process. During the evening-sector events studied, the electron density was decreasing, whereas the electron temperature was generally increasing. Such events are strongly related to variations in the magnetic H component detected on the ground.

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