Measurements of gradients in ionospheric parameters with a new nine-position experiment at Millstone Hill

Details Measurements of gradients in ionospheric parameters with a new nine-position experiment at Millstone Hill Measurements of gradients in ionospheric parameters with a new nine-position experiment at Millstone Hill

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..705b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 6, p. 705-717

Physics

11

Diurnal Variations, F Region, Ion Motion, Ionospheric Drift, Multistatic Radar, Radar Scattering, Spatial Distribution, Wind Velocity, Altitude, Continuity Equation, Diffusivity, Electron Density (Concentration), Electron Energy, Incoherent Scattering, Magnetohydrodynamic Flow, Meridional Flow, Oxygen Ions

Scientific paper

A new nine-position experiment is now routinely carried out with the Millstone Hill incoherent scatter radars which allows estimation of spatial gradients in the measured ionospheric scalar parameters N(sub e), T(sub e) and T(sub i), and in the components of the ion velocity vector v(sub i). Use of this technique results in improved estimates of basic and derived parameters from incoherent scatter data at times of significant gradients. We detail the data analysis method and present the first results from this new experiment. The gradients in N(sub e) and in the components of v(sub i) are used to compute the motion term in the ionospheric F region continuity equation which is then combined with partial derivative (N)/partial derivative (T) to estimate the O(+) recombination rate beta at night. Meridional neutral winds are computed from the field-aligned ion velocity v(sub i) and a calculation of the O(+) diffusion velocity and it is found that horizontal gradients in the ion velocity field at times significantly affect the calculation of the neutral winds.

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