Very low frequency oscillations of the differentially rotating Solar Interior and Earth’s climate

Mahir Pirguliyev, Shamakhy Astrophysical Observatory named after N.Tusi, Azerbaijan National Academy of Sciences

MHD-equations are considered for the Solar Interior, taking into account the mechanism of generation of energy in the core and radiation losses. Using asymptotic methods, it is shown that from the problem of eigenfunctions at very small latitudinal rotational velocity gradients, Rossby-type modes are obtained for compressible, non-adiabatic waves with frequencies much lower than the rotation frequency. The solution of the corresponding boundary value problem gives us an integral dispersion relation for complex eigenfrequencies. Among the most unstable modes, modes with periods of 1500–20000 years, which is known from geophysical data on abrupt changes in the Earth’s climate, are of great interest. in the past. This gives us the basis for the fact that these long-term fluctuations with a period of about 4,500 years may be the cause of the Dansgaard-Eshger event: these are abrupt onset of warm periods during the last ice age, the average distances of which were 4500 years.