Physics of auroral phenomena : proceedings of the 33rd Annual seminar, Apatity, 02 - 05 March, 2010 / [ed.: A.G. Yahnin, A. A. Mochalov]. - Апатиты : Издательство Кольского научного центра РАН, 2011. - 206 с. : ил.

Time-dependent modeling o fthe initial stage o f theformation o f cyclones in the intratropical convergence zone o fthe northern hemisphere directions are 32° and 25°, respectively. Calculations were performed for the cases when the simulation domain is intersected by the intratropical convergence zones with different configurations. The results of simulations indicated that the origin of a convexity in the configuration of the intratropical convergence zone can lead to the formation of a cyclone during the period for about one day. Its center is close to the southern edge of the initial intratropical convergence zone. The horizontal wind velocity in this cyclone can achieve a value o f 20 m/s during the period of 27 hours. The cyclone has a horizontal extent of about 600 km. Physical reason of the cyclone formation is the origin of a convexity in the form of the intratropical convergence zone. The increase o f the horizontal wind velocity in the cyclone is due to the transformation of energy, emitted owing to water freezing, into kinetic energy of the air flow. A cknow ledgm ents. This work was partly supported by the Basic Research Program No. 16 of the Presidium of the Russian Academy of Sciences and by the RFBR grant 10-01-00451. References Belotserkovskii, O.M., I.V. Mingalev, V.S. Mingalev, O.V. Mingalev, and A.M. Oparin, Mechanism of the appearance of a large-scale vortex in the troposphere above a nonuniformly heated surface, Doklady Earth Sciences, 411(8), 1284-1288, 2006. Belotserkovskii, O.M., I.V. Mingalev, V.S. Mingalev, O.V. Mingalev, A.M. Oparin, and V.M. Chechetkin, Formation of large-scale vortices in shear flow of the lower atmosphere of the Earth in the region of tropical latitudes, Cosmic Research, 47(6), 466-479, 2009. Mingalev, I. V. and V.S. Mingalev, The global circulation model of the lower and middle atmosphere of the Earth with a given temperature distribution, Mathematical Modeling, 17(5), 24-40,2005 (in Russian). Mingalev, I.V., V.S. Mingalev, and G.I. Mingaleva, Numerical simulation of the global distributions of the horizontal and vertical wind in the middle atmosphere using a given neutral gas temperature field, J. Atmos. Solar-Terr. Phys., 69(4/5), 552-568, 2007. 185