  A convective model describing the nature and structure of the roton is
proposed. According to the model, the roton is a cylindrical convective cell
with free horizontal boundaries. On the basis of the model, the characteristic
geometric dimensions of the roton are estimated, and the spatial distribution
of the velocity of the helium atoms and the perturbed temperature inside are
described. It is assumed that the spatial distribution of rotons has a
horizontally multilayer periodic structure, from which follows the quantization
of the energy spectrum of rotons. The noted quantization allows us to
adequately describe the energy spectrum of rotons. The convective model is
quantitatively confirmed by experimental data on the measurement of the density
of the normal component of helium II, the scattering of neutrons and light by
helium II. The use of a convective model for describing the scattering of light
by Helium II made it possible to estimate the dipole moment of the roton, as
well as the number of helium atoms participating in the formation of the roton.
