On Friday, May 3, 2024, at 19:00, senior scientists at High Altitude Observatory (US),  Mausumi Dikpati, will present the online seminar “Magnetic Cycle of the Sun.” The seminar will be held within the online seminars organized by the Department of Astronomy and Astrophysics of Space Research Center (Ilia State University).

Solar magnetic activity occurs in multi-spatial and multi-temporal scales. The waxing and waning in the number of sunspots with 11-year periods is widely known as the decadal-scale solar cycle. Among various manifestations of the solar cycle, the most well-known are the equatorward propagation of the sunspot belts with 11-year periods, the poleward drift of polar fields, and the Sun’s North and South poles reversing every 11 years. While the decadal solar cycle follows roughly a sinusoidal pattern, there also exists within that 11-year sinusoid the short-term “seasons” of activity with 5 months – 2 years periods, which constitute Rieger-type and quasi-biennial variability in solar activity. In this talk, I will discuss how the decadal solar cycle,, as well as quasi-annual “seasons” of solar activity,, get generated through the magnetohydrodynamics in the Sun and how these multi-scale solar magnetic activity hazardously impacts the terrestrial environment through space weather.

Zoom Link:https://uni-graz.zoom.us/j/6435542130?pwd=L3hiTlBIM2s3RnpLMDV1azhUUThtdz09