  Observations of C/2014 Q2 (Lovejoy) comet were carried out on 7th February,
2015, at the observation station in Mayaki village (No. 583 -- Odesa-Mayaki
observatory). The integrated-light photometry of the comet was conducted using
RC-800 telescope (D = 80 cm; F = 214.0 cm) with FLI MicroLine 9000 CCD camera.
The photometric primary reductions included dark-frame subtraction and
flat-field correction. The photometric study of the comet plasma tails was
performed using an interactive program to construct a series of longitudinal
and transverse profiles of individual tail rays. The Shulman diffusion model
was applied to interpret the calculated photometric profiles. The comparison of
the experimental profiles and those calculated theoretically from the diffusion
model enabled us to estimate the following physical parameters of the comet
plasma tail: acceleration a = 176 m/sec$^2$ and lifetime of fluorescent ions
$\tau$ = 2.7$\cdot$10$^3$ sec; longitudinal and transverse diffusion
coefficients, and magnetic flux density B = 97 $\pm$ 5.3 nT.
