Measurements of gradients in ionospheric parameters with a new nineposition experiment at Millstone Hill
Abstract
A new nineposition 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 fieldaligned 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.
 Publication:

Journal of Atmospheric and Terrestrial Physics
 Pub Date:
 May 1995
 DOI:
 10.1016/00219169(94)00047R
 Bibcode:
 1995JATP...57..705B
 Keywords:

 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;
 Geophysics