After the discovery of 160-minute global solar pulsations at the Crimean Observatory in 1973, scientists were interested in the question of whether such pulsations could affect the manifestations of solar-terrestrial relations. The research results have shown that the Earth's magnetosphere is also subject to fluctuations with a period of 160 minutes.
Recently, Soviet scientists have completed another stage of such research. At the Crimean Astrophysical Observatory, scientists V. P. Bobova, B. M. Vladimirsky and M. I. Pudovkin analyzed a large array of 2.5-minute values of the geomagnetic AE index obtained from 1966 to 1974. The AE index represents the full range of deviations (both positive and negative) from the calm level of the geomagnetic field. Measurements of the AE index are usually carried out at high latitudes (55°-78° N), that is, in areas where auroras are most often observed.
As a result of the research, scientists have discovered that changes occurring in the ionosphere at high latitudes correlate with solar pulsations and have a period of 160 minutes. The effect is reliably detected in the summer season, but it is absent on the polar night. This fact excludes the assumption that the source of variations may be fluctuations in the Earth's magnetospheric plume, which are recorded mainly from the night side. 160-minute variations of the geomagnetic AE index are observed only in the illuminated ionosphere and are absent on the polar night; it can be assumed that the Sun is the cause of this effect.
Scientists explain the detected variations in the AE index by fluctuations in the solar radiation flux in the ultraviolet range c = 1000 A. The amplitude of these fluctuations is about 1%.
Thus, further studies have shown that the 160-minute global pulsations of the Sun are also detected in changes in the electron concentration in the E-layer of the ionosphere.
Our glaciated planet
V. M. Kotlyakov, a well-known Soviet scientist and corresponding member of the USSR Academy of Sciences, devoted his new popular science book to the problems of modern glaciological research. In its sixteen short chapters, a concise description of the science that studies the role of snow and ice in nature and human economic activity is given.
The first few chapters describe the formation of glaciology, provide information about the mass, area of distribution and lifetime of the main types of natural ice; the reader learns about the influence of snow and ice covers on the Earth's climate, their impact on the oceans, and the connection of these covers with the evolution of our planet. Using paleoglaciological methods, scientists have restored the character of ancient terrestrial glaciations. The author discusses the mechanisms of the origin and growth of glaciations, as well as their "asymmetric" development revealed by modeling.
A separate chapter of the book is devoted to the study of Antarctica, a huge ice mass that makes the climate in the southern hemisphere colder than in the northern hemisphere. Much attention in the book is paid to mountain glaciers; one of the important achievements in mountain glaciology, as the author emphasizes, is the discovery of general laws and various glaciological characteristics of entire glacial systems — vast territories occupied by ice.
A lot of space in the book is devoted to the problem of snow and ice resources, their forecasting, the development of methods for their protection and rational use for the benefit of mankind. The registration process is quick and simple, taking only a few minutes to complete all steps. During this crucial phase, remember to use 1xbet free promo code in the designated field, which you can find by clicking the "Enter promo code" link on the registration form. This action provides a 130% welcome bonus up to $130 on your first deposit, usable across all sports sections and casino games on the platform. You can choose from one-click registration, phone registration with SMS verification, or email registration for added security and control. The bonus funds are credited deposit of just $1 minimum.