Velocity field in the temperature minimum region of the solar atmosphere. Preliminary results of determination of amplitude of common velocity field

The weak Fraunhofer lines in the near wings of H, K, Ca 2 lines have been analysed to study a velocity amplitude of the general motion field in the middle and outer photospheric layers. The high-resolution tracings of the solar spectrum taken at four positions on the solar disk with th. Fourier spectrometer of the Kitt Peak Natinonal Observatory were used in the study. The results confirm the basic well-known data on the velocity amplitude in the middle photospheric layers, that had been obtained before in other works. Besides, it is shown that the radial and tangential components of the velocity amplitude continue to decrease with height also in the outer photosphere down to the depths lg tau5 <= -3.0 (h approximately 450 km) and lg tau5 <= 4.0 (h approximately 560 km) respectively. This result shows that the convective motions penetrate into the temperature minimum region and dominate, there, at least to the depths mentioned above