| Name: | Anu B Sreedevi |
| Affiliation: | INDIAN INSTITUTE OF TECHNOLOGY (BANARAS HINDU UNIVERSITY), VARANASI |
| Conference ID : | ASI2023_400 |
| Title : | Observational study of bipolar magnetic regions: Support of thin-flux tube rise model? |
| Authors : | Anu B Sreedevi, Bibhuti Kumar Jha, Bidya Binay Karak, Dipankar Banerjee |
| Mode of Presentation: | Oral |
| Abstract Category : | Sun and the Solar System |
| Abstract : | The bipolar magnetic regions (BMRs) are the intense magnetic field regions on the surface of the Sun. These BMRs are (statistically) tilted with respect to the equatorial line, which increases with the increase of their latitudes. In the thin flux tube model, it is believed that BMRs are produced due to the rise of the toroidal magnetic flux tubes from the base of the convection zone and during their rise, the torque induced by the Coriolis force acting on the diverging flows induced from the apexes of the flux tubes produces BMR tilt. Although this rising flux tube model has been a popular explanation for the observed BMR formation, it has not been observationally established. Therefore, we study the line-of-sight (LOS) magnetograms from Michelson Doppler Imager (MDI) and Helioseismic and Magnetic Imager (HMI) for the last two solar cycles. We study the time evolution of the properties of BMR throughout their lifetimes by tracking them using an automated algorithm. The evolutions of BMR tilt, foot separation and flux hint the theory of thin flux tube behind the formation of BMR.
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